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Letteratura scientifica selezionata sul tema "Soils Analysis"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 31 luglio 2024

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Articoli di riviste sul tema "Soils Analysis"

Williams, Stephen E. "A Review and Analysis of Rangeland and Wildland Soil Health". Sustainability 16, n. 7 (29 marzo 2024): 2867. http://dx.doi.org/10.3390/su16072867.

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Soil health is focused on intensively managed (IM) soils (often farmed soils), by-passing extensively managed (EM) soils (range lands, deserts, shrub lands, tundra). High economic value products are generated by IM systems. Many EM lands are of cultural, recreational, scenic, or scientific value. However, and despite the fact that they provide forage for domestic and wild animals, they are not always of high economic value. IM and EM soils are evaluated on the same health scales. The contention herein is all soils formed under soil state conditions under the absence of human interventions are inherently healthy. But a given soil has dynamic properties that determine its management as IM or EM. An EM sagebrush steppe soil may be deemed unhealthy as a result of low organic matter and short growing season. An IM grassland steppe soil is healthy as a result of high organic matter and a long growing season. The sagebrush soil, however, provides habitat for culturally important sage grouse. The grassland soil may provide, when plowed, habitat for economically important soybeans. Soil taxonomies can be used to establish inherent health of undisturbed soils. Determining a soil’s dynamic nature is a different construct. Here, four different sets of EM soils were evaluated to showcase their diversity, evaluate levels of health and display their often-unconventional dynamic characteristics. An argument is made that a soil’s health, an inherent condition, is not the same as its dynamic condition (potential to produce goods and services). Soil health changes are usually slowly driven by soil state factors but can be dramatically changed by humans. Otherwise, soil health can be viewed as a near constant ecosystem attribute. The dynamic nature of soils change according to needs placed by humans. EM soils may be healthy but lack attention since their dynamic nature is not traditional and often of low economic value. Evaluation of soil health and dynamic value on EM lands is often exacerbated by information absence. Strategies to circumvent this include sampling design, reference sites and standardized ways of EM soil health determination. A case is made that baselines of soil health can be taken from soil surveys, taxonomic names, and soil data from map units, where such information exists. Certified supplementary information is ambiguously available, but may be crucial. Outdoor living laboratories that feature inherent soil health and dynamic soil alternatives may help circumvent information voids.

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Cui, Jifei, Yanhao Jin, Yingjie Jing e Yu Lu. "Elastoplastic Solution of Cylindrical Cavity Expansion in Unsaturated Offshore Island Soil Considering Anisotropy". Journal of Marine Science and Engineering 12, n. 2 (9 febbraio 2024): 308. http://dx.doi.org/10.3390/jmse12020308.

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An elastoplastic analysis scheme for the cylindrical cavity expansion in offshore islands unsaturated soils considering anisotropy is established. The hydraulic properties and anisotropy caused by stress of unsaturated soils are coupled in an elastoplastic constitutive matrix for unsaturated soil to obtain the governing equations for the cylindrical cavity expansion problem, with an analytical solution that utilizes the original hydro-mechanical state of the soil as the initial conditions. Through a comparative analysis with other analytical solutions, the effectiveness of the new solution is verified. Moreover, the swelling response of the cylindrical cavity expansion in unsaturated soils is examined by systematically analyzing different parameters of the surrounding soil. The findings reveal that the development and rate of anisotropy in normal consolidated soil and over-consolidated soil exert a significant impact on the soil’s mechanical characteristics. Nevertheless, the alteration in the model constant h has little effect on the soil’s mechanical characteristics. The analytical solution introduces anisotropy and broadens the expansion theory of unsaturated soils to yield a more comprehensive theoretical framework for the comprehensive analysis of offshore islands’ unsaturated soils.

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Yang, Tai Hua, Huai Jian He e Xiang Chao Gong. "Analysis Again for Earth Pressure Calculation Theory Considering Displacement Effects". Advanced Materials Research 368-373 (ottobre 2011): 2755–59. http://dx.doi.org/10.4028/www.scientific.net/amr.368-373.2755.

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According to Moore-Coulomb strength theory, combined with the shear strength reduction method, assumed that the exerted value of the soil’s internal friction Angle and displacement were in nonlinear, and the exerted value of the soil’s cohesion and displacement were in linear, and then put forward a unified, continuous with displacement earth pressure calculation model, and this model could be used to calculate the active and passive earth pressure for cohesive soils and cohesionless soils in any nonlimited state and any movement mode. Through the analysis of the calculation model showed that: (1) The above assumptions were all reasonable from the two perspectives of the theoretical and the measuring; (2) The variation process of earth pressure acted on the retaining wall with displacement, could regard as the process of the soil’s shear strength parameters exerting gradually; (3) Given the physical meanings to the calculated parameters; (4) Analyzed the characteristics of the calculation model, and pointed out that there were calculation errors when the displacement of retaining wall was in (0, x0H) for the Rankine earth pressure theory.

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Le, Van Thao, Didier Marot, Abdul Rochim, Fateh Bendahmane e Hong Hai Nguyen. "Suffusion susceptibility investigation by energy-based method and statistical analysis". Canadian Geotechnical Journal 55, n. 1 (gennaio 2018): 57–68. http://dx.doi.org/10.1139/cgj-2017-0024.

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Internal erosion is one of the main causes of instabilities within hydraulic earth structures. Four internal erosion processes can be distinguished, and this study deals with the process of suffusion, which corresponds to the coupled processes of detachment–transport–filtration of the soil’s fine fraction between the coarse fraction. Because of the great length of earth structures and the heterogeneities of soils, it is very difficult to characterize the suffusion susceptibility of the different soils. Nevertheless, a statistical analysis can be performed to optimize the experimental campaign. By using a dedicated erodimeter, an experimental program was set up to study suffusion susceptibility of 31 specimens of nonplastic and low-plasticity soils. The suffusion susceptibility is determined by the erosion resistance index, which relates the total loss of mass with the total energy expended by the seepage flow. Fourteen physical parameters are selected, and a multi-variate statistical analysis leads to a correlation between the erosion resistance index and all these parameters. A statistical analysis is performed to identify the main parameters and to focus on those that can easily be measured on existing structures. By distinguishing gap-graded and widely graded soils, two correlations are proposed to estimate the erosion resistance index.

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Ivanyuk, Halyna. "Analysis of “Systematics of Polish Soils”". Visnyk of the Lviv University. Series Geography, n. 44 (28 novembre 2013): 122–32. http://dx.doi.org/10.30970/vgg.2013.44.1210.

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The “Systematics of Polish Soils” (SgP, 2011) is very close to WRB and “Soil Taxonomy”. The morphological characteristics of the soils, investigated in the field, rather than soil genesis are diagnostic criteria. The main provisions of the new “Systematics”, properties of soils of higher taxonomic levels have been reviewed. Some diagnostic horizons, which were not borrowed from other classifications, have been described. We tried to find equivalents in the Ukrainian classification for some soils names. The correlation of Poland soils and WRB has been analyzed. Key words: Systematics of Polish Soils, classification, order, soil type, diagnostic horizon, WRB.

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Chakravarthy, Thokala, e K. Shyam Chamberlin. "Fly ash and bagasse ash embankment in flexible pavements for the analysis and strengthening of black cotton soil’s strength stabilized properties". E3S Web of Conferences 391 (2023): 01005. http://dx.doi.org/10.1051/e3sconf/202339101005.

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Soil stabilization is necessary to increase the soil’s durability, volume stability, and engineering expansion strength. Expansive soils (also known as black cotton soil), a problem that affects the entire world and poses various challenges for civil engineers, are extremely hard while dry but completely lose their strength when wet. In this study, fly ash has been employed to stabilize the soil. Five, ten, twenty, and twenty-five percent of fly ash was used in the experiments. Bagasse ash is an easily accessible byproduct of the sugar cane refining process that has negative environmental effects. In this study, any potential pozzolanic benefits are evaluated while taking into account bagasse ash. material that stabilizes elongated soil In order to examine the soils’ geotechnical characteristics, the experimental investigation focuses on altering the fly ash content of the soils. The goal is to learn more about the characteristics of black cotton soil’s tensile strength. The primary goal of this research is to examine the effects of bagasse ash on the engineering expansive soil’s properties as revealed by various lab tests, and after improving the treated soil through embankment work at various civil engineering activities, such as roadways.

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Baldrian, P. "Microbial enzyme-catalyzed processes in soils and their analysis". Plant, Soil and Environment 55, No. 9 (14 ottobre 2009): 370–78. http://dx.doi.org/10.17221/134/2009-pse.

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Currently, measuring enzyme activities in soils or other lignocellulose-based materials is technically feasible; this measurement is particularly suitable for evaluating soil processes of biopolymer (cellulose, hemicelluloses, lignin, chitin and others) degradation by microbes and for assessing cycling and mobilization of principal nutrients including nitrogen, phosphorus and sulfur. With some considerations, assay methods can provide reliable information on the concentration of enzymes in soil or the rates of enzyme-catalyzed processes. Enzyme analyses in recent studies demonstrated a high level of spatial variability of soil enzyme activity both in depth and in space. The vertical gradients of enzyme activities are most developed in forest soils. Furthermore, enzyme activity in soils is regulated by seasonally-dependent variables such as temperature, moisture and the input of fresh litter. While several enzymes are widely produced by different groups of soil microorganisms, some of them can be used as indicators of the presence or activity of specific microbial taxa.

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Kaminski, P., M. Urlaub, J. Grabe e C. Berndt. "Geomechanical behaviour of gassy soils and implications for submarine slope stability: a literature analysis". Geological Society, London, Special Publications 500, n. 1 (19 dicembre 2019): 277–88. http://dx.doi.org/10.1144/sp500-2019-149.

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AbstractSubmarine slope failures pose a direct threat to seafloor installations and coastal communities. Here, we evaluate the influence of free gas on the soil's shear strength and submarine slope failures in areas with gassy soils based on an extensive literature review. We identify two potential destabilization mechanisms: gas bubbles in the pore space lead to a reduced shear strength of the soil and/or gas induces excess pore pressures that consequently reduce the effective stress in the soil. Our evaluation of the reported mechanical and hydraulic behaviour of gassy sediments indicates that the unfavourable impact of entrapped gas on a soil's shearing resistance is not sufficient to trigger large-scale slope failures. Liquefaction failure due to high gas pressures is, however, a viable scenario in coarse-grained soils. Transferring the gas influence on the soil mechanical behaviour to constitutive models is identified as the most important prerequisite for a successful future analysis of slope stability.

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Conte, Enrico. "Consolidation analysis for unsaturated soils". Canadian Geotechnical Journal 41, n. 4 (1 agosto 2004): 599–612. http://dx.doi.org/10.1139/t04-017.

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This paper deals with the multidimensional consolidation of unsaturated soils when both the air phase and water phase are continuous. Following the approach proposed by D.G. Fredlund and his coworkers, the differential equations governing the coupled and uncoupled consolidation are first derived and then solved numerically. The solution is achieved using a procedure that depends on the transformation of the field equations by using the Fourier transform. This transformation has the effect of reducing a two- or three-dimensional problem to a problem involving only a single spatial dimension. The transformed equations are solved using a finite element approximation that makes use of simple one-dimensional elements. Once the solution in the transformed domain is obtained, the actual solution is achieved by inversion of the Fourier transform. The time integration process is formulated in a stepwise form. Results are presented to point out some aspects of the consolidation in unsaturated soils. Moreover, it is shown that the results obtained using the simple uncoupled theory are of sufficient accuracy for practical purposes.Key words: coupled consolidation, uncoupled consolidation, unsaturated soils, Fourier transform.

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Najafi-Ghiri, M., e A. Abtahi. "Potassium fixation in soil size fractions of arid soils". Soil and Water Research 8, No. 2 (15 maggio 2013): 49–55. http://dx.doi.org/10.17221/52/2012-swr.

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Amounts of potassium (K) fixed in soil fractions of 10 calcareous soils of southern Iran were measured to evaluate the contributions of different soil size fractions to K fixation. Soil particles were fractionated after dispersion of the soils with an ultrasonic probe. Potassium fixation analysis was done by addition of 1000 mg K/kg samples. Mineralogy of the size fractions was determined by X-ray diffraction. The clay fractions were dominated by smectite, chlorite, mica, and palygorskite. Potassium fixation capacities ranged from 104 to 148 mg/kg for clay, from 102 to 155 mg/kg for silt, and from 96 to 187 mg/kg for sand fractions. A positive and significant relationship (P < 0.05) was obtained between K fixation capacity and smectite content for the clay fractions. High amounts of K fixed in the sand fraction may be explained by a larger diffusion path of fixed K out of the frayed edges of micaceous and smectitic minerals into the extracting solution, low cation exchange capacity (CEC) of the coarse fraction and thereby the high concentration gradient along solution and interlayers, physical entrapment of K ions in coarse aggregates cemented by carbonates, and by the presence of clay particles in coarse fractions due to incomplete dispersion of coarse aggregates.

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Più fonti

Tesi sul tema "Soils Analysis"

Song, Chi-Yong. "Numerical formulation for a dynamic analysis of the plastic behavior in saturated granular soils". Columbus, Ohio Ohio State University, 2003. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1070309764.

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Thesis (Ph. D.)--Ohio State University, 2003.
Title from first page of PDF file. Document formatted into pages; contains xix, 246 p.; also includes graphics. Includes abstract and vita. Advisor: William E. Wolfe, Dept. of Civil Engineering. Includes bibliographical references (p. 137-142).

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Kim, Hak Jin. "Ion-selective electrodes for simultaneous real-time analysis for soil macronutrients". Diss., Columbia, Mo. : University of Missouri-Columbia, 2006. http://hdl.handle.net/10355/4471.

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Thesis (Ph.D.)--University of Missouri-Columbia, 2006.
The entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. Title from title screen of research.pdf file viewed on (April 26, 2007) Vita. Includes bibliographical references.

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Schaefer, Vernon Ray. "Analysis of reinforced embankments and foundations overlying soft soils". Diss., Virginia Polytechnic Institute and State University, 1987. http://hdl.handle.net/10919/49886.

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The use of tensile reinforcement to increase the tensile strength and shear strength of soils has lead to many new applications of reinforced soil. The use of such reinforcing in embankments and foundations over weak soils is one of the most recent applications of this technology. The studies conducted were concerned with the development of and application of analytical techniques to reinforced soil foundations and embankments over weak soils. A finite element computer program was modified for application to reinforced soil structures, including consolidation behavior of the foundation soil. Plane strain and axisymmetric versions of the program were developed and a membrane element developed which has radial stiffness but no flexural stiffness. The applicability of the program was verified by comparing analytical results to case histories of reinforced embankments and to model studies of reinforced foundations. A simplified procedure for computing the bearing capacity of reinforced sand over weak clay was developed which is more general than those previously available. Good agreement with available experimental results was obtained, providing preliminary verification of the procedure. Extensive analyses were made of a reinforced embankment successfully constructed with no sign of distress, and of two reinforced embankments constructed to failure. These analyses showed that good agreement can be obtained between measured and calculated reinforcement forces, settlements, and pore pressures for both working and failure conditions. The analyses further show that the use of the finite element method and limit equilibrium analyses provide an effective approach for the design of reinforced embankments on weak foundations.
Ph. D.
incomplete_metadata

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Silver, Richard. "Unsaturated Flow Analysis of Heap Leach Soils". Thesis, Boston College, 2013. http://hdl.handle.net/2345/3055.

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Thesis advisor: Alan Kafka
Heap leach flow patterns are governed by hydrogeological parameters including, soil properties, saturated and unsaturated hydraulic conductivity, initial degree of saturation, and the method of irrigation. Optimizing production during leaching cycles requires knowledge of the hydrogeological parameters of the leach heap, and their effect on flow behavior. This thesis research involved quantifying the flow rates of unsaturated homogenous soil profiles. Finite element numerical modeling has been utilized to simulate 1-dimensional unsaturated transient vertical flow. A series of parametric studies were conducted to examine how various soil properties and differing initial and boundary conditions affect percolation and flow. Results indicate that flow and percolation are increased or impeded based on the saturated and unsaturated parameters of the soil profile. Sensitivity analysis illustrates that the initial degree of saturation affects hydraulic behaviour relative to soil hydraulic conductivity, matric potential (negative pressure head), and the method of irrigation. At the initial stage of the research, some analyses indicated that numerical instabilities may occur within simulations due to selected mesh density, initial time step length, error tolerance, and the selected form of the unsaturated Richards Equation
Thesis (MS) — Boston College, 2013
Submitted to: Boston College. Graduate School of Arts and Sciences
Discipline: Earth and Environmental Sciences

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Tsiampousi, Aikaterini. "Numerical analysis of slopes in unsaturated soils". Thesis, Imperial College London, 2011. http://hdl.handle.net/10044/1/6885.

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Conventional constitutive models developed for saturated soils are inadequate when analysing problems involving unsaturated conditions. Although unsaturated constitutive models are available in the Imperial College Finite Element Program (ICFEP), there are aspects of unsaturated soil response that are not adequately simulated. The aim of the present thesis is to develop and implement numerical expressions describing the most relevant of these features and to apply them in combination with the existing ICFEP capabilities to boundary value problems involving unsaturated soils. The over-prediction of the peak shear stress exhibited by overconsolidated soils and the simplicity of the soil-water retention relationship employed, constitute the focal points of the improvements suggested. A new surface is introduced to substitute for the yield and plastic potential functions on the dry side of critical state, in order to prevent the available constitutive models from overestimating the peak deviatoric stress. The development, implementation and calibration of this surface are presented, followed by analyses of laboratory experiments demonstrating the improved simulation of soil behaviour. Novel formulations are proposed for the soil-water retention curve, which defines the relationship between the degree of saturation or the water content and the applied suction, modelling its hysteretic nature and incorporating the effect of specific volume. Ultimately, a three-dimensional hysteretic surface, defined in terms of degree of saturation, suction and specific volume, is presented. The new developments are subsequently applied to the numerical analysis of boundary value problems involving (a) the stability of slopes in overconsolidated unsaturated soils and (b) the behaviour of unsaturated soil slopes under seasonal changes of suction, highlighting the importance of adopting appropriate constitutive models.

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Larsen, Zachary S. "Thin Soils and Sacbes: The Soil Resources of Uci, Yucatan, Mexico". BYU ScholarsArchive, 2012. https://scholarsarchive.byu.edu/etd/3505.

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The objective of this study was to use pedological evidence in conjunction with Geographic Information Systems, and soil physical and chemical analyses as means to better understand the agricultural landscape surrounding the ancient Maya city of Uci. Specifically, the query of this thesis is to determine whether there is an association between settlement density and soil resources, and what relationship if any there is between the ancient sacbe of Uci and its surrounding agricultural potential. Stable carbon isotope analysis of the humin fraction of the soil organic matter was conducted on several profiles from karst depressions known as rejolladas near the site center, and from a select number of sufficiently deep profiles along and surrounding the ancient sacbe, and from beneath ancient structures. A strong C isotopic signature of ancient C4 crops was found in a limited number of profiles while a majority of the profiles showed no evidence, or little to inconclusive evidence due to a mixture of C3 and C4 plants in the natural landscape. A majority of the soils surrounding Uci are shallow to extremely shallow and many profiles sampled and studied did not allow for C isotopic analysis. Isotopic evidence along with other soil chemical and physical characteristics suggests that settlement density was linked to soil resources, specifically in the case of the rejolladas proximity to the Uci site center. However, it does not appear that the construction and location of the sacbe was linked to its surrounding soil resources or agricultural potential even though ancient maize crops may have been cultivated sporadically close to the sacbe and nearby structures. The soil resources of Uci are not conducive to the production of large maize crops and the ancient Maya of this area likely utilized maize along with alternative crops, arboriculture, wild game and trade to sustain its population.

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Pelletier, Bernard 1964. "A multivariate analysis of tree species influence on forest floor fertility /". Thesis, McGill University, 1993. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=68239.

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The objective of this study was to assess tree species influence on forest floor fertility in a mixed forest stand using Redundancy Analysis (RDA). Eighty microsites were located in a beech-hemlock-red maple forest. Forest floor was analyzed for thirteen variables; total N, P, K, Ca and Mg, extractable Ca, Mg and K, mineralizable N (NH$ sb{4+}$), basal microbial respiration (CO$ sb2$), pH, thickness and bulk density. The influence of seven tree species was calculated as a function of tree diameter and distance from each microsite. Spatial patterns were detected by using correlograms and incorporated in a variation-partitioning model with trend surface analysis. Tree species, microtopography, and spatial structure explained 53% of the total variation in forest floor data. The fraction explained by tree species alone (16%) was studied with a RDA ordination biplot. The main source of variation in the soil data was related mainly to the opposite effects of American beech and eastern hemlock on calcium while most of the other species had a beneficial effect on soil fertility. This study showed the potential of RDA as a tool for studying the role of tree species in mixed forests.

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Golchin, Ahmad. "Spatial distribution, chemistry and turnover of organic matter in soils". Title page, contents and summary only, 1996. http://web4.library.adelaide.edu.au/theses/09PH/09phg617.pdf.

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Copies of author's previously published works inserted. Bibliography: leaves 260-299. This thesis describes the concept of organic matter turnover and various methods to measure the decay rates of organic materials in the soil. Methods are developed to separate SOM from different locations within the soil matrix. Free particulate organic matter (POM), located between or outside the soil aggregates is isolated. Occluded POM is disaggregeted by sonification. The compositional differences noted among the three components of SOM are used to describe the changes that OM undergoes during decomposition. The process is followed as organic matter enters the soil, is enveloped in aggregates and is eventually incorporated into the microbial biomass and metabolites then becoming associated with clay minerals.

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Romero, Salome M. "Ground motion amplification of soils in the upper Mississippi Embayment". Diss., Georgia Institute of Technology, 2001. http://hdl.handle.net/1853/32841.

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Nolin, Anne Walden 1958. "CLASSIFICATION AND MAPPING OF SOILS USING A MULTISPECTRAL VIDEO SYSTEM AND COMPUTER-AIDED ANALYSIS". Thesis, The University of Arizona, 1987. http://hdl.handle.net/10150/276549.

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An airborne multispectral video system was used to collect soil spectral data over a four-square mile region in northeastern Arizona. Six multispectral video images were digitized. Using the red and blue bands of each image, an unsupervised classification was performed. Each was referenced to a digitized U.S. Soil Conservation Service map resulting in classification precisions ranging from 0-92.4 percent. Ground radiometric measurements were made to ascertain spectral separability of the soil samples. Soil color was determined to try to relate Munsell value to classification precision. Misclassification of soil map units was unrelated to soil brightness or areal extent of each soil. Rather, features such as slope, boundary complexity, and surface condition was responsible for misclassifications seen in this study. Best classification results occurred when soil mapping units were relatively homogeneous, possessed slight changes in slope, and had a regular surface with smooth and distinct boundaries.

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Libri sul tema "Soils Analysis"

1944-, Campbell James B., a cura di. Soil landscape analysis. London: Routledge & Kegan Paul, 1985.

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Sparks, Donald L., Ph. D., Soil Science Society of America. e American Society of Agronomy, a cura di. Methods of soil analysis. Madison, Wis: Soil Science Society of America, 1996.

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G, Gregorich E., e Carter Martin R, a cura di. Soil sampling and methods of analysis. 2^a ed. Boca Raton, FL: CRC Press, 2007.

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H, Dane J., Topp G. Clarke, Campbell Gaylon S e Soil Science Society of America., a cura di. Methods of soil analysis. Madison, Wis: Soil Science Society of America, 2002.

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Arnold, Klute, Campbell G. S e Soil Science Society of America., a cura di. Methods of soil analysis. 2^a ed. Madison, Wis: Soil Science Society of America, 1986.

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A, Klein K., e Fam Moheb A. 1966-, a cura di. Soils and waves. Chichester: J. Wiley & Sons, 2001.

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1931-, Brown J. R., e Soil Science Society of America. Division S-4., a cura di. Soil testing: Sampling, correlation, calibration, and interpretation : proceedings of a symposium. Madison, Wis., USA: Soil Science Society of America, 1987.

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1951-, Boutton Thomas W., e Yamasaki Shin-ichi 1937-, a cura di. Mass spectrometry of soils. New York: M. Dekker, 1996.

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Yuliya, Smirnova, a cura di. Terrain analysis of Afghanistan. Minneapolis: East View Cartographic, 2003.

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Rowell, Michael J. Evaluation of soil testing methods for arable soils in Botswana. Gaborone, Botswana: M.J. Rowell, 1988.

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Più fonti

Capitoli di libri sul tema "Soils Analysis"

Zhang, Jie, Te Xiao, Jian Ji, Peng Zeng e Zijun Cao. "Spatial Variability of Soils". In Geotechnical Reliability Analysis, 173–226. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-19-6254-7_5.

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Rate, Andrew W. "Spatial Variability and Data Analysis in Urban Soils". In Urban Soils, 53–88. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-87316-5_3.

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Nicu, Ionut Cristi. "Soils". In Hydrogeomorphic Risk Analysis Affecting Chalcolithic Archaeological Sites from Valea Oii (Bahlui) Watershed, Northeastern Romania, 39–43. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-25709-9_8.

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Yang, Zhaochun. "Consolidation of Soils". In Material Modeling in Finite Element Analysis, 137–45. 2^a ed. Boca Raton: CRC Press, 2023. http://dx.doi.org/10.1201/9781003436317-21.

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Erickson, Andrew J., Peter T. Weiss e John S. Gulliver. "Analysis of Water and Soils". In Optimizing Stormwater Treatment Practices, 193–214. New York, NY: Springer New York, 2012. http://dx.doi.org/10.1007/978-1-4614-4624-8_11.

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Brancier, Jeanne, Amandine Courte, Dominique Todisco e Michel Brossard. "Physicochemical Analysis of Neotropical Soils". In Methods in Historical Ecology, 34–45. Abingdon, Oxon ; New York, NY : Routledge, 2021.: Routledge, 2020. http://dx.doi.org/10.4324/9780429060175-6.

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Malley, D. F., P. D. Martin e E. Ben-Dor. "Application in Analysis of Soils". In Near-Infrared Spectroscopy in Agriculture, 729–84. Madison, WI, USA: American Society of Agronomy, Crop Science Society of America, Soil Science Society of America, 2015. http://dx.doi.org/10.2134/agronmonogr44.c26.

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Arlinghaus, Sandra Lach, William C. Arlinghaus, William D. Drake e John D. Nystuen. "Soils and Forestry Data Analysis". In Practical Handbook of Curve Fitting, 127–46. Boca Raton: CRC Press, 2023. http://dx.doi.org/10.1201/9781003418221-6.

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Sway, T. Swe A. T., e S. Bang. "Analysis of geofiber reinforced soils". In New Horizons in Earth Reinforcement, 357–62. London: CRC Press, 2023. http://dx.doi.org/10.1201/9781003416753-54.

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Duncan, Chester I. "Settlement Analysis". In Soils and Foundations for Architects and Engineers, 106–28. Boston, MA: Springer US, 1998. http://dx.doi.org/10.1007/978-1-4615-5417-2_6.

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Atti di convegni sul tema "Soils Analysis"

Kaminski, Pauline, Jürgen Grabe e Zeest Fatima. "Miniaturised Testing Device for the Qualitative Analysis of Gas Exsolution in Soil". In ASME 2023 42nd International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2023. http://dx.doi.org/10.1115/omae2023-101605.

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Abstract The presence of gas is a widespread phenomenon in marine and coastal soils, often accompanied by complications in engineering application. The characteristics of the gas phase in the pore space are relevant for the assessment of the soil mechanical implications. In granular soils the formation of capillary bridges between the soil particles can invoke cohesive forces. In fine-grained soils gas-induced fractures may weaken the soil structure. Additionally, an excessive gas production leads to a build-up of pore pressures and can thereby trigger a liquefaction failure in granular soils. To enable a differentiated investigation of these features, however, it is vital to look into the inner pore space of a gassy soil. For this purpose, a miniaturised experimental set-up was developed which allows for the documentation of gas bubble nucleation and growth in a soil’s pore space by means of the imaging technique X-ray computed tomography. Herein, gassy soil samples with a stationary grain structure are obtained by means of the axis-translation technique. The degree of saturation is adjusted by a controlled pressure relief. During image processing the three phases — soil particles, pore water and gas — are identified and thus, their interaction can be studied. The microscopic insights gained with the help of this experimental set-up will allow validation or falsification of the basic theoretical assumptions on gassy soils. Furthermore, the data bears great potential for the advancement of approaches for multiphase simulation.

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Young, Michael H., William A. Albright, Karl F. Pohlmann, Greg M. Pohll, Walter H. Zachritz, Stephen Zitzer, David S. Shafer, Irene Nester e Layi Oyelowo. "Designing Alternative Landfill Covers Using Parametric Uncertainty Analysis". In Fourth International Conference on Unsaturated Soils. Reston, VA: American Society of Civil Engineers, 2006. http://dx.doi.org/10.1061/40802(189)53.

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McCartney, John S., e Jorge G. Zornberg. "Decision Analysis for Design of Evapotranspirative Landfill Covers". In Fourth International Conference on Unsaturated Soils. Reston, VA: American Society of Civil Engineers, 2006. http://dx.doi.org/10.1061/40802(189)54.

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Hong, Dae-Seok, Jong-Sik Shon, Tae-Kuk Kim e Han-Seok Cho. "Development of the Analysis Method for the Radioactivity Concentration Estimation of Soils for a Regulatory Clearance". In 14th International Conference on Nuclear Engineering. ASMEDC, 2006. http://dx.doi.org/10.1115/icone14-89443.

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In this study, for the analysis of a radioactivity concentration of soil, a sampling and an analyzing method were developed. To create homogeneity of the contents for each drum, big particles such as pebbles, rocks and scraps of concrete were removed after pouring the soil into a tray. And then the soil in the tray was mixed thoroughly. A 10 × 10 grid was used to partition the soil into 100 sections. 2 liter of soil was sampled out of 30 randomly pre-selected sections. Only 1 liter of the soil out of 2 liters was used for the γ-spectrometry analysis. The remaining 1 liter of soil was stored for a validation purpose. For a verification of the sampling process, 3 samples were taken from each drum and analyzed. 5 drums were used for the verification. And the results show that this sampling method has about a 9% sampling error. Also, the analysis results of the 865 drums of soil showed that the major nuclides in the soils were Co-60 and Cs-137 while a small amount of Mn-54, Fe-59, I-131, Cs-134 and Eu-152 were detected as γ-emitters. About 73% of the soils had a total radioactivity concentration below 0.1 Bq/g, while the soils with more than 0.4 Bq/g of a radioactivity concentration were only 3%. Based on the guide for the regulatory clearance criteria recommended by the IAEA (International Atomic Energy Agency), about 73% of the soils can be regulatory cleared without any treatment. Also, the remaining soils can be regulatory cleared after a further storage. Only 3% of the soils are considered to be necessary for a decontamination treatment. The results of this study can be applied to the treatment of radioactive soils generated in a large amount during the decommissioning of a nuclear facility.

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Heydinger, Andrew G., e B. O. A. Davies. "Analysis of Variations of Pavement Subgrade Soil Water Content". In Fourth International Conference on Unsaturated Soils. Reston, VA: American Society of Civil Engineers, 2006. http://dx.doi.org/10.1061/40802(189)15.

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Habte, Michael A., e Nasser Khalili. "A Constitutive Model for Cyclic Analysis of Unsaturated Soils". In Fourth International Conference on Unsaturated Soils. Reston, VA: American Society of Civil Engineers, 2006. http://dx.doi.org/10.1061/40802(189)162.

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Murray, E. J., e J. Brown. "Assumptions in Equilibrium Analysis and Experimentation in Unsaturated Soil". In Fourth International Conference on Unsaturated Soils. Reston, VA: American Society of Civil Engineers, 2006. http://dx.doi.org/10.1061/40802(189)204.

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Fuselier, Tulin, Lewis Edgers e Farrokh Nadim. "Transient Flow in Unsaturated Soils: Numerical Analysis and Case Study". In Fourth International Conference on Unsaturated Soils. Reston, VA: American Society of Civil Engineers, 2006. http://dx.doi.org/10.1061/40802(189)173.

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Velosa, C. L., e J. E. Colmenares. "Analysis of the Volume Change Behavior of Expansive Compacted Soils". In Fourth International Conference on Unsaturated Soils. Reston, VA: American Society of Civil Engineers, 2006. http://dx.doi.org/10.1061/40802(189)73.

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Abramova, Anna. "ENVIRONMENTAL ASSESSMENT OF COAL MINING PRACTICES IN SVALBARD: INSIGHTS FROM SOIL, VEGETATION, AND COAL ELEMENTAL ANALYSIS". In 23rd SGEM International Multidisciplinary Scientific GeoConference 2023. STEF92 Technology, 2023. http://dx.doi.org/10.5593/sgem2023/5.1/s20.14.

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This study quantifies the elemental composition of soil, vegetation, and the level of trace elements in coals to identify the impacts associated with coal mining practices in the Longyearbyen and Barentsburg settlements, the Svalbard archipelago. The analysis is based on a data set that includes 26 chemical elements measured in 74 soil, 29 vegetation, and 4 coal samples provided by a catena-based survey strategy. The concentrations of lead (Pb), nickel (Ni), copper (Cu), zinc (Zn), chromium (Cr), and vanadium (V) in the soils did not exceed the European regulatory standards (the Finnish Standard and the Norwegian Soil Quality Standard), while arsenic (As) and cadmium (Cd) overstepped their threshold values in some soils. The Geoaccumulation Index (Igeo) values showed that soils were enriched in titanium (Ti), strontium (Sr), boron (B), and zirconium (Zr). The elemental screening of the exposed coals, soils, and vegetation revealed high concentrations of these four elements as well. The examination of geospatial patterns shows that the concentrations of Ti, Sr, Zr, and B in the soils are distributed evenly along the most of the sampling transects (catenas). While the distribution of elements in the soils between the transects (catenas) varies considerably, the highest concentrations for Ti, Sr, B, and Zr are observed near the currently operating coal mining and transportation facilities.

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Rapporti di organizzazioni sul tema "Soils Analysis"

Drumm, E. C. Soil mechanics and analysis of soils overlying cavitose bedrock. Office of Scientific and Technical Information (OSTI), agosto 1987. http://dx.doi.org/10.2172/5998770.

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Berney IV, Ernest S., e Ronald E. Wahl. A Rapid Soils Analysis Kit. Fort Belvoir, VA: Defense Technical Information Center, marzo 2008. http://dx.doi.org/10.21236/ada483829.

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Liu e Nixon. L52305 Probabilistic Analysis of Pipeline Uplift Resistance. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), giugno 2010. http://dx.doi.org/10.55274/r0000002.

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To investigate the feasibility of probabilistic analyses of the peak uplift resistance in frozen soils by varying parameters that are known to be important for the development of the uplift resistance under the upward movement of a pipe. A buried pipeline will be subjected to a variety of forces, both internal and external, including the interaction of the pipe with the surrounding soil. The soil-pipe interaction in permafrost regions have to account for the behavior of frozen and unfrozen soil, and transitions between the two as the pipeline traverses in a discontinuous permafrost zone. The variations in the properties and behavior of frozen soils are expected to be substantial in three dimensions of the Right-of-Way (ROW) and with time (seasonal fluctuations and changes with the history of pipeline operation). Given the uncertainties with frozen soil properties and the changes in behavior with time and location, a large variation in soil-pipe interaction characteristics can exist. The uplift resistance of a pipeline is one of these soil-pipe interactions that can be impacted by a variation in soil condition and state. A need was identified to outline the use of a probabilistic analysis of pipe uplift resistance in an attempt to capture the magnitude of these variations and uncertainties of frozen soil and the impact on the soil-pipe interaction. The probabilistic analysis allows the designer of a pipeline to consider a range of uplift resistance to a certain confidence level that would represent the likely values that a pipe may be subjected to. The work presented in this report is more focused on the methodology of the probabilistic approach, rather than the analysis itself for a specific design case, even though an example is provided for illustration purposes. A series of numerical simulations using Fast Lagrangian Analysis of Continua (FLAC) were completed varying one parameter with each run to develop a library of peak uplift resistances for a variety of different temperatures, soil properties and pipe parameters. The FLAC model was previously developed for PRC, a summary of this report is provided here to outline important parameters that were used to complete this analysis. The simulations were used to develop a correlation of peak uplift resistance as a function of soil tensile strain limit, modulus of deformation, and creep of frozen soils. Each of these parameters is dependent of the pipeline conditions such as temperature, displacement rate, and effective frozen cover depth. It is noted that the scope of the work was to develop a probabilistic method of estimating peak uplift resistance in frozen soils. Even though some sensitivity analysis were carried out, as outlined later in this report, to assess the impacts of the variable, detailed uncertainty analysis or risk assessment were not performed.

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Buck, E. C., N. L. Dietz, J. K. Bates e J. C. Cunnane. Uranium-contaminated soils: Ultramicrotomy and electron beam analysis. Office of Scientific and Technical Information (OSTI), febbraio 1994. http://dx.doi.org/10.2172/10106831.

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Berney, Ernest, Naveen Ganesh e David Daily. Revised Rapid Soils Analysis Kit (RSAK) – wet methodology. Engineer Research and Development Center (U.S.), febbraio 2018. http://dx.doi.org/10.21079/11681/26411.

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Shivakumar, Pranavkumar, Kanika Gupta, Antonio Bobet, Boonam Shin e Peter J. Becker. Estimating Strength from Stiffness for Chemically Treated Soils. Purdue University, 2022. http://dx.doi.org/10.5703/1288284317383.

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The central theme of this study is to identify strength-stiffness correlations for chemically treated subgrade soils in Indiana. This was done by conducting Unconfined Compression (UC) Tests and Resilient Modulus Tests for soils collected at three different sites—US-31, SR-37, and I-65. At each site, soil samples were obtained from 11 locations at 30 ft spacing. The soils were treated in the laboratory with cement, using the same proportions used for construction, and cured for 7 and 28 days before testing. Results from the UC tests were compared with the resilient modulus results that were available. No direct correlation was found between resilient modulus and UCS parameters for the soils investigated in this study. A brief statistical analysis of the results was conducted, and a simple linear regression model involving the soil characteristics (plasticity index, optimum moisture content and maximum dry density) along with UCS and resilient modulus parameters was proposed.

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Beal, Samuel, Ashley Mossell e Jay Clausen. Matrix and target particle-size effects on LIBS analysis of soils. Engineer Research and Development Center (U.S.), gennaio 2020. http://dx.doi.org/10.21079/11681/35374.

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Girard, I., e R. A. Klassen. A comparison of seven methods for analysis of carbon in soils. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2001. http://dx.doi.org/10.4095/212695.

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Wells, Aaron, Tracy Christopherson, Gerald Frost, Matthew Macander, Susan Ives, Robert McNown e Erin Johnson. Ecological land survey and soils inventory for Katmai National Park and Preserve, 2016–2017. National Park Service, settembre 2021. http://dx.doi.org/10.36967/nrr-2287466.

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This study was conducted to inventory, classify, and map soils and vegetation within the ecosystems of Katmai National Park and Preserve (KATM) using an ecological land survey (ELS) approach. The ecosystem classes identified in the ELS effort were mapped across the park, using an archive of Geo-graphic Information System (GIS) and Remote Sensing (RS) datasets pertaining to land cover, topography, surficial geology, and glacial history. The description and mapping of the landform-vegetation-soil relationships identified in the ELS work provides tools to support the design and implementation of future field- and RS-based studies, facilitates further analysis and contextualization of existing data, and will help inform natural resource management decisions. We collected information on the geomorphic, topographic, hydrologic, pedologic, and vegetation characteristics of ecosystems using a dataset of 724 field plots, of which 407 were sampled by ABR, Inc.—Environmental Research and Services (ABR) staff in 2016–2017, and 317 were from existing, ancillary datasets. ABR field plots were located along transects that were selected using a gradient-direct sampling scheme (Austin and Heligers 1989) to collect data for the range of ecological conditions present within KATM, and to provide the data needed to interpret ecosystem and soils development. The field plot dataset encompassed all of the major environmental gradients and landscape histories present in KATM. Individual state-factors (e.g., soil pH, slope aspect) and other ecosystem components (e.g., geomorphic unit, vegetation species composition and structure) were measured or categorized using standard classification systems developed for Alaska. We described and analyzed the hierarchical relationships among the ecosystem components to classify 92 Plot Ecotypes (local-scale ecosystems) that best partitioned the variation in soils, vegetation, and disturbance properties observed at the field plots. From the 92 Plot Ecotypes, we developed classifications of Map Ecotypes and Disturbance Landscapes that could be mapped across the park. Additionally, using an existing surficial geology map for KATM, we developed a map of Generalized Soil Texture by aggregating similar surficial geology classes into a reduced set of classes representing the predominant soil textures in each. We then intersected the Ecotype map with the General-ized Soil Texture Map in a GIS and aggregated combinations of Map Ecotypes with similar soils to derive and map Soil Landscapes and Soil Great Groups. The classification of Great Groups captures information on the soil as a whole, as opposed to the subgroup classification which focuses on the properties of specific horizons (Soil Survey Staff 1999). Of the 724 plots included in the Ecotype analysis, sufficient soils data for classifying soil subgroups was available for 467 plots. Soils from 8 orders of soil taxonomy were encountered during the field sampling: Alfisols (<1% of the mapped area), Andisols (3%), Entisols (45%), Gelisols (<1%), Histosols (12%), Inceptisols (22%), Mollisols (<1%), and Spodosols (16%). Within these 8 Soil Orders, field plots corresponded to a total of 74 Soil Subgroups, the most common of which were Typic Cryaquents, Typic Cryorthents, Histic Cryaquepts, Vitrandic Cryorthents, and Typic Cryofluvents.

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