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Опубліковано: 11 вересня 2023

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Статті в журналах з теми "SOIL-WATER CHARACTERISTICS CURE"

1

Aniculaesi, Mircea, Irina Lungu, and Anghel Stanciu. "Cure Time Effect on Compressibility Characteristics of Expansive Soils Treated with Eco-Cement." Advanced Materials Research 587 (November 2012): 129–33. http://dx.doi.org/10.4028/www.scientific.net/amr.587.129.

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The objective of this paper is to investigate the influence of curing time on expansive soil as a construction material when treated with eco-cement stabilizer, as partly substituting the Portland cement. Standard consolidation samples were prepared from treated soils with 10 % cement (5% eco-cement and 5% Portland cement), reported to the dry unit weight of soil, and cured for 1, 7 and 14 days. After this period the soil samples were then socked in water and standard consolidation tests were performed on them. The compressibility characteristics, for the improved soil with 10% cement, Eoed, mv and Cv have shown a significant improvement during the first 7 days. After 7 days curing time the variation of compressibility characteristics is less pronounced.
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2

L. Tsai, K., C. M. Chan, and P. C. Tan. "Compaction and CBR Characteristics of Sandy Clay Stabilised with Fibre-Mixed Binder." International Journal of Engineering & Technology 7, no. 4.14 (December 24, 2019): 343. http://dx.doi.org/10.14419/ijet.v7i4.14.27671.

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Soil chemical stabilization is an effective yet comparatively economical ground improvement method which involves injecting or blending a binder into the existing soil to enhance the geotechnical properties (e.g. strength and stiffness) for load-bearing purposes. The technique is especially beneficial for road construction works on clayey soil of limited load-bearing capacity such as rural roads. It required thick road base is critical to ensure long-term stability and performance. An endeavour is therefore undertaken to examine the effectiveness of a proprietary fibre-mixed binder in stabilizing soils (sandy clay) nature to serve as road base material. Kaolin was mixed with sand as the base soil at ratios of 0, 25 and 50% sand addition. The fibre-mixed binder was added at dosages of 1.5, 2.5 and 3.5% as recommended by the proprietor. Standard compaction test was first carried out to determine the optimum water content for each kaolin-sand mix. Then left to cure for 1, 3, 7 and 28 days before subjected to the California Bearing Ratio (CBR) test. From the test results, it was found that 2.5% binder addition was sufficient to attain the minimum CBR requirement of 30% for supporting a conventional flexible pavement, as per JKR standard. However, the 100% clay sample required higher binder dosages. Clearly sand particles in the soil contributed to the formation of skeletal scaffolding of the soil matrix, bound and supported by the fibre-mixed binder for enhanced strength properties. This was evident in the compaction test where 50% sand addition reduced the optimum water content by almost half compared to the 100% clay. Moreover 3-day curing could adequately strengthen all samples to attain the minimum CBR requirement (JKR standard), irrespective of the binder dosage used. In conclusion, it could effectively strengthen sandy clay soils within 3 days with dosages as low as 2.5%.
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3

Boutouba, Kheira, Ismail Benessalah, Ahmed Arab, and Ahmed Djafar Henni. "Shear Strength Enhancement of Cemented Reinforced Sand: Role of Cement Content on the Macro-Mechanical Behavior." Studia Geotechnica et Mechanica 41, no. 4 (December 30, 2019): 200–211. http://dx.doi.org/10.2478/sgem-2019-0020.

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Abstract Sands reinforced by hydraulic binders (cement) have constituted in recent decades a major asset for the expansion of several areas of engineering. The mechanical behavior of sand-cement mixtures has undergone some controversies studied on the Chlef sand. In this paper, we present an experimental study to investigate the mechanical behavior of a sandy soil reinforced by a hydraulic binder (cement), using the direct shear apparatus emphasizing on the shear strength characteristics and the vertical deformation variation of cemented reinforced sand. The parameters used in this study are mainly: relative density (Dr = 80%), normal stress (σn = 100, 200, 400 kPa), water content (3, 7 and 10%), cement content (2.5, 5, 7.5 and 10 %) and cure time (7, 14 and 28 days). The experimental results show that the mechanical characteristics in terms of internal cohesion (C) and internal frication angle (φ) give a better mechanical performance with the binder inclusion, and the cure conditions play an effective role on the improvement of the shear strength. This result also showed that 10% of the cement content gave us a maximum value of shear strength and an optimal influence on the mechanical characteristics. The addition of cement not only improves the shear strength of soil, but also provides diversity in the resistance against the deformations imposed load, which can be established by a dilatant character.
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4

Nur, S. H., and Nofriana. "Shear Strength Behaviour of Sedimentary Soil Stabilized by Fly Ash." IOP Conference Series: Earth and Environmental Science 1117, no. 1 (December 1, 2022): 012057. http://dx.doi.org/10.1088/1755-1315/1117/1/012057.

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Abstract Sedimentary soil is made up of deposits that are the consequence of the weathering of rocks that have already been deposited elsewhere by various natural processes, including water, wind, and others. A location with sedimentary soil is the Bili-bili Dam in the South Sulawesi Province's Gowa Regency. Sedimentary soil at this location is quite abundant and has not been used in general, so it can be investigated for its use, namely stability against the influence of external forces on the carrying capacity of the sedimentary soil. Stabilizing the soil is one approach to boost its bearing capacity, particularly for sedimentary soil. The original soil is categorized as group A-4, or silty soil, according to the AASHTO classification system and as ML, or silt with low plasticity, according to the USCS classification system, based on the findings of physical characteristics testing. It has been demonstrated that the soil's cohesiveness and shear angle increase with the addition of fly ash. It has been demonstrated that adding fly ash stabilizing material to the sedimentary soil of the Bili-bili Dam and allowing it to cure increased the cohesion value from the initial soil cohesion value of 0.72 kg/cm2 to 1.70 kg/cm2 after 28 days. With a 20% fly ash mixture and a curing period of 28 days, the shear angle value increased from the initial soil shear angle value of 22 to 31; this is a 40% increase in the shear angle value.
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Rahmawan, Alfian, and Farid Ma'ruf. "PENCEGAHAN DEMAM BERDARAH PADA MASYARAKAT DUSUN MONGKRONG GUNUNG KIDUL." SPEKTA (Jurnal Pengabdian Kepada Masyarakat : Teknologi dan Aplikasi) 1, no. 1 (August 24, 2020): 35. http://dx.doi.org/10.12928/spekta.v1i1.2696.

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DBD is an infectious disease by the Dengue virus, which is transmitted through the bite of Aedes aegypti mosquitoes. This disease's characteristics include sudden high fever accompanied by bleeding manifestations and the tendency to cause shock that can cause death. Until now, there is no cure for dengue fever or a vaccine. So the only way to prevent this disease is to break the chain of transmission. The main factor of dengue fever in Indonesia is the Aedes aegypti mosquito. Another way to avoid dengue fever is the correct 3M plus method, namely 1. Close, cover all places that can hold water, both inside and outside the house. 2. Drain, drain water reservoirs such as bathtubs, aquariums, and flower vases two times a week. The mosquito metamorphosis cycle, from egg to adult mosquito, lasts 8-10 days. 3. Bury. Bury all objects that can hold water, such as used cans or plastic containers. However, in the 3M movement, which has been renewed to 3M plus, this third M is no longer recommended because it can cause soil pollution
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Gallegos-Fonseca, Gustavo, Julio Leal-Vaca, and Eduardo Rojas-González. "Conductividad hidráulica de una arena limosa obtenida a partir de la curva característica." Ingeniería, investigación y tecnología 12, no. 3 (July 1, 2011): 285–90. http://dx.doi.org/10.22201/fi.25940732e.2011.12n3.028.

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7

Choi. "Assessing Distribution of Degree of Saturation for Track Transition Zone Using Soil Water Characteristic Curve." Journal of the Korean Society of Civil Engineers 35, no. 2 (2015): 515. http://dx.doi.org/10.12652/ksce.2015.35.2.0515.

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8

Matula, S., M. Mojrová, and K. Špongrová. "Estimation of the soil water retention curve (SWRC) using pedotransfer functions (PTFs)." Soil and Water Research 2, No. 4 (January 7, 2008): 113–22. http://dx.doi.org/10.17221/2106-swr.

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Анотація:
Soil hydraulic characteristics, especially the soil water retention curve and hydraulic conductivity, are essential for many agricultural, environmental, and engineering applications. Their measurement is time-consuming and thus costly. Hence, many researchers focused on methods enabling their indirect estimation. In this paper, W&ouml;sten&rsquo;s continuous pedotransfer functions were applied to the data from a selected locality in the Czech Republic, Ti&scaron;ice. The available data set related to this locality consists of 140 measured soil water retention curves, and the information about the soil texture, bulk density &rho;<sub>d</sub>, and organic matter content determined at the same time. Own continuous pedotransfer functions were derived, following the methodology used in continuous pedotransfer functions. Two types of fitting, 4-parameters and 3-parameters, were tested. In 4-parameter fitting, all parameters of the van Genuchten&rsquo;s equation, &theta;<sub>s</sub>, &theta;<sub>r</sub>, &alpha;, n, were optimized; in 3-parameter fitting, only three parameters, &theta;<sub>r</sub>, &alpha;, n, were optimised while the measured value of &theta;<sub>s</sub> was set as constant. Based on the results, it can be concluded that the general equations of W&ouml;sten&rsquo;s pedotransfer functions are not very suitable to estimate the soil water retention curves for the locality Ti&scaron;ice in the Czech Republic. However, the parameters of the same W&ouml;sten&rsquo;s equations, which were calculated only from the data for each particular locality, performed much better. The estimates can be improved if the value for the saturated soil water content &theta;<sub>s</sub> is known, applied and not optimised (the case of 3-parameter fitting). It can be advantageous to estimate SWRC for a locality with no data available, using PTFs and the available basic soil properties. In addition, to measure some retention curves and/or some their parameters, like &theta;<sub>s</sub>, can improve the accuracy of the SWRC estimation.
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9

Wang, Zehui, Kangning Xiong, Chenxu Wu, Ding Luo, Jie Xiao, and Chuhong Shen. "Characteristics of Soil Moisture Variation in Agroforestry in Karst Region." Land 12, no. 2 (January 28, 2023): 347. http://dx.doi.org/10.3390/land12020347.

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The special above-ground and underground dual structure in the karst area makes the capacity of surface water storage in this area poor. In water-limited ecosystems, soil moisture is the key to the survival of plants. Influenced by rainfall and soil texture, soil moisture variation characteristics of different vegetation types are different in slope land. Many researchers use rainfall simulation experiments to study the influence of soil water movement processes under rainfall patterns, but there are few studies under natural conditions. In this paper, wood trees, peach trees, flue-cured tobacco, and grassland were planted at the buffer zone boundary of Shibing, a World Heritage site, along different elevations in the depression of the research site. Peach trees and flue-cured tobacco were the main cash crops in the area. The soil layers of 0–0.15 m, 0.15–0.30 m, 0.30–0.45 m, 0.45–0.60 m, and 0.60–0.75 m were taken as research objects. Rainfall and soil moisture were monitored every ten minutes to study the variation of soil moisture of vegetation types under different rainfall patterns. Through the analysis of soil physicochemical properties and vegetation types, it was found that soil moisture changes were different in different land types. In general, shallow soil moisture (0~0.30 m) was more active in the wet season (CV > 10%) but tended to be stable in the dry season. The rainy season rainfall had the greatest influence on soil moisture change. The response level of soil moisture to rainfall of all vegetation types was grassland > peach trees > flue-cured tobacco. These results can provide ecological and economic suggestions for karst areas with large population distribution in China, so as to reduce the impact of rock desertification on this area.
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10

Jia, Yinggang, Yuhan Liu, and Jian Chen. "Comparison of Solidification Characteristics between Polymer-Cured and Bio-Cured Fly Ash in the Laboratory." Polymers 15, no. 5 (February 23, 2023): 1107. http://dx.doi.org/10.3390/polym15051107.

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Fly ash (FA) usually causes air and soil pollution due to wind erosion. However, most FA field surface stabilization technologies have long construction periods, poor curing effects, and secondary pollution. Therefore, there is an urgent need to develop an efficient and environmentally friendly curing technology. Polyacrylamide (PAM) is an environmental macromolecular chemical material for soil improvement, and Enzyme Induced Carbonate Precipitation (EICP) is a new friendly bio-reinforced soil technology. This study attempted to use chemical, biological, and chemical-biological composite treatment solutions to solidify FA, and the curing effect was evaluated by testing indicators, such as unconfined compressive strength (UCS), wind erosion rate (WER), and agglomerate particle size. The results showed that due to the viscosity increase in the treatment solution, with the increase in PAM concentration, the UCS of the cured samples increased first (from 41.3 kPa to 376.1 kPa) and then decreased slightly (from 376.1 kPa to 367.3 kPa), while the wind erosion rate of the cured samples decreased first (from 39.567 mg/(m2·min) to 3.014 mg/(m2·min)) and then increased slightly (from 3.014 mg/(m2·min) to 3.427 mg/(m2·min)). Scanning electron microscopy (SEM) indicated that the network structure formed by PAM between the FA particles improved the physical structure of the sample. On the other hand, PAM increased the nucleation sites for EICP. Due to the stable and dense spatial structure formed by the “bridging” effect of PAM and the cementation of CaCO3 crystals, the mechanical strength, wind erosion resistance, water stability, and frost resistance of the samples cured by PAM-EICP were increased significantly. The research will provide curing application experience and a theoretical basis for FA in wind erosion areas.
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Дисертації з теми "SOIL-WATER CHARACTERISTICS CURE"

1

AHMED, AATIF. "EXPERIMENTAL STUDY ON WETTING SOIL WATER CHARACTERISTIC CURVE OF SAND WITH MIXTURE OF BENTONITE CLAY." Thesis, DELHI TECHNOLOGICAL UNIVERSITY, 2021. http://dspace.dtu.ac.in:8080/jspui/handle/repository/18888.

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Анотація:
Soil-water characteristic curve (SWCC) also known as water retention curve is an integral part of unsaturated soil mechanics. SWCC is a constitutive relation in unsaturated soil mechanics where soil suction is related to water content. Wetting SWCCs were determined for different sand-bentonite clay mixtures. With the help of the Van-Genuchten equation, acquired test data were fitted. Wetting SWCC can be related to flow of water through unsaturated zones of soil from the groundwater table to the ground surface. Negative column test was employed to determine SWCC since it is fairly simple and simulates the actual field conditions. In the present paper, different soil samples, where sand is mixed with varying proportions of bentonite clay are considered, for determining wetting SWCC. Finer the soil particle, higher will be the soil suction for a given water content. Hence, as the content of clay increases, SWCC slightly shifts towards the right, indicating the increment in soil suction. In turn, water entry value(WEV) also shoots up.
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2

Tu, Hongyu. "Prediction of the Variation of Swelling Pressure and 1-D Heave of Expansive Soils with respect to Suction." Thesis, Université d'Ottawa / University of Ottawa, 2015. http://hdl.handle.net/10393/32515.

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Анотація:
The one-dimensional (1-D) potential heave (or swell strain) of expansive soil is conventionally estimated using the swelling pressure and swelling index values which are determined from different types of oedometer test results. The swelling pressure of expansive soils is typically measured at saturated condition from oedometer tests. The experimental procedures of oedometer tests are cumbersome as well as time-consuming for use in conventional geotechnical engineering practice and are not capable for estimating heave under different stages of unsaturated conditions. To alleviate these limitations, semi-empirical models are proposed in this thesis to predict the variation of swelling pressure of both compacted and natural expansive soils with respect to soil suction using the soil-water characteristic curve (SWCC) as a tool. An empirical relationship is also suggested for estimating the swelling index from plasticity index values, alleviating the need for conducting oedometer tests. The predicted swelling pressure and estimated swelling index are then used to estimate the variation of 1-D heave with respect to suction for expansive soils by modifying Fredlund (1983) equation. The proposed approach is validated on six different compacted expansive soils from US, and on eight field sites from six countries; namely, Saudi Arabia, Australia, Canada, China, US, and the UK. The proposed simple techniques presented in this thesis are friendly for the practitioners for using when estimating the heave in unsaturated expansive soils.
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3

Cuceoglu, Faik. "An Experimental Study on Soil Water Characteristics and Hydraulic Conductivity of Compacted Soils." Thesis, Virginia Tech, 2016. http://hdl.handle.net/10919/73673.

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The importance of applying unsaturated soil mechanics concepts to geotechnical engineering design has been widely recognized. Soil water characteristic curve (SWCC) and hydraulic conductivity function (HCF) are vital soil properties that govern engineering behavior of unsaturated soils. In this study, a transient water release and imbibitions method (TRIM) is used to measure the SWCC and HCF under drying and wetting states, which accommodates integrated experimental and modeling techniques. The results of saturated hydraulic conductivity tests through flexible wall method are then used as input parameters for simulating experimental data. In general, the model provides a satisfactory fit to experimental data. Soil water characteristic curves (SWCCs) and hydraulic conductivity functions (HCFs) are presented for a variety of soils that were prepared at different molding water contents and compactive efforts. The influences of dry density, molding water content, and hysteresis have been investigated. Dry density affects soil-water characteristic in terms of its air-entry value (AEV), rate of drying, and size of the hysteresis loop. The test results indicate that the SWCC and HCF obtained in terms of volumetric water content is more sensitive to the changes in dry density than molding water content. Based on cohesive soil results, some statistical relations are proposed to estimate wetting-path SWCC and HCF parameters from more easily measured drying curves. Changes in the van Genuchten's fitting parameters and residual volumetric water content are investigated for both drying and wetting conditions, with changes in the kaolin clay content.
Master of Science
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4

Regmi, Sanjeev. "EFFECT OF PLASTICITY AND INITIAL COMPACTION CONDITIONS ON SOIL WATER CHARACTERISTICS CURVE OF FINE-GRAINED SOILS." OpenSIUC, 2019. https://opensiuc.lib.siu.edu/theses/2625.

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Анотація:
The soil water characteristics curve (SWCC) of a soil plays an important role in study of unsaturated soil mechanics. The behavior of unsaturated soil is a complex phenomenon to understand and the direct measurement of unsaturated soil properties in laboratory or in field is costly and time consuming. Knowing the SWCC of a soil is useful in estimating the unsaturated property of a soil, which is close to the natural soil conditions and can be used in effective design procedure. The present study deals with the effect of plasticity and initial compaction conditions of a soil in the SWCC by using SWC-150 (Fredlund SWCC device) and WP4C dewpoint potentiometer. The test data obtained from both the device were best fitted using Fredlund and Xing (1994) equation (FX), Van Genutchen (1980) equation (VG), Burdine (1958) equation, and Mualem (1976) equation.
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5

van, Quang Pham. "Soil formation and soil moisture dynamics in agriculture fields in the Mekong Delta, Vietnam conceptual and numerical models." Licentiate thesis, KTH, Land and Water Resources Engineering, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-10508.

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Previous studies of agricultural conditions in the Mekong Delta (MD) have identified soil compaction as an obstacle to sustainable production. A conceptual model for soil formation was presented to demonstrate the link between soil hydrology and plant response. Detailed studies of soil moisture dynamics in agricultural fields were conducted using a dynamic process-orientated model. Pressure head and water flow were simulated for three selected sites during a year for which empirical data were available. Daily meteorological data were used as dynamic input and measured pressure head was used to estimate parameter values that satisfied various acceptance criteria. The Generalised Likelihood Uncertainty Estimation (GLUE) approach was applied for calibration procedures with 10,000 runs, each run using random values within the chosen range of parameter values. To evaluate model performance and uncertainty estimation, re-sampling was carried out using coefficient of determination (R2) and mean error (ME) as the criteria. Correlations between parameters and R2 (and ME) and among parameters were also considered to analyse the relationship of the selected parameter set in response to increases/decreases in the acceptable simulations. The method was successful for two of the three sites, with many accepted simulations. For these sites, the uncertainty was reduced and it was possible to quantify the importance of the different parameters.

 

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6

Vivian, Juliana Baum. "Utilização do método do papel filtro para a determinação das curvas características de um solo coluvionar não saturado contaminado com óleo diesel." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2008. http://hdl.handle.net/10183/14377.

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Para a determinação do comportamento de um solo não saturado, é necessária a identificação da sua curva característica, que representa a capacidade de armazenamento de água pelo solo em função do valor de sucção imposto. Quando este solo é submetido a algum processo de contaminação, a sua estrutura interna pode ser alterada por processos físico-químicos, modificando, por conseqüência, o seu comportamento. Esta dissertação propõe uma metodologia de ensaio para a determinação de curvas características de sucção total em um solo artificialmente contaminado com diferentes teores de óleo diesel. O programa experimental proposto consiste basicamente na realização do método do papel filtro, através da técnica sem contato entre a amostra e o papel, com algumas modificações em relação às metodologias anteriormente descritas na literatura geotécnica. Foram também executados ensaios para controle e quantificação da evaporação do contaminante ao longo do tempo, e sua possível absorção pelo papel filtro utilizado. Além disso, foram realizados ensaios para a caracterização física, mineralógica e química do solo, antes e após a adição do óleo, com o intuito de constatar as alterações causadas pela contaminação. O material estudado é constituído por sedimentos coluvionares provenientes de arenito da Formação Botucatu, sendo que sua curva característica, sem contaminação, já foi determinada em um estudo anterior, através do método do papel filtro com contato. Para possibilitar comparações entre estes resultados, foram medidos também alguns pontos em amostras não contaminadas, através da técnica proposta nesta dissertação. Estes apresentaram uma satisfatória concordância em relação à curva anteriormente ajustada. Na análise das curvas características do solo contaminado com 2%, 5%, 10% e 15% de óleo diesel, constatou-se a permanência do formato bimodal, sugerindo que a microestrutura e a macroestrutura continuam influenciando na entrada e saída de água do meio. Entretanto, foram identificadas alterações na forma da curva e na extensão dos patamares resultantes, em relação à curva característica sem contaminação, assim como as diferentes localizações dos valores de entrada de ar. Foi verificado que, conforme o aumento do teor de contaminante, há uma gradual tendência ao formato unimodal da curva característica, induzindo a um comportamento de solo tipicamente granular. Este fato foi comprovado nos resultados de microscopia eletrônica, onde se verifica que, com teores menores de óleo, a estrutura do solo encontra-se mais fechada e, à medida que este teor aumenta, a estrutura torna-se mais porosa. Os tempos de equalização para o método de ensaio proposto variaram entre 7 e 30 dias, conforme o nível de sucção da amostra. A avaliação da histerese revelou que, com o aumento do teor de contaminante, há uma pequena redução deste fenômeno. Além disso, os ensaios complementares comprovaram a existência de uma pequena porcentagem de evaporação do óleo diesel, assim como a absorção do mesmo pelo papel filtro, que se apresentou praticamente nula.
The unsaturated soil behavior can be determined through its soil-water characteristic curve, which represents the capacity of the soil to store water when submitted to different suction levels. When this soil is contaminated, its internal structure can be modified according to physical and chemical processes, thus changing the initial behavior. This dissertation proposes a test methodology to determine the total-suction soil-water characteristic curves of a contaminated soil at different diesel oil contents. The experimental program consisted of using the filter-paper method without contact between the sample and the paper, but with some modifications in relation to previously studied techniques. Some control tests were also carried out to check oil evaporation and its absortion by the filter paper. Besides, the samples were submitted to physical, mineralogical and chemical characterization, before and after contamination, to verify the possible changes. The studied material is a colluvium soil, constituted basically by sandstone, from the Botucatu Formation. This soil was previously studied by the filter-paper method with contact, and its soil water characteristic curve without contamination was already known. To compare the results, the proposed test methodology was also performed with non contaminated samples, showing a satisfactory agreement with the initial curve. The soil-water characteristic curves of this soil with a diesel oil content of 2%, 5%, 10% and 15% showed a "saddle" shape, indicating that both the microstructure and the macrostructure were influenced by the entrance and exit of water through the soil. However, the shape of the curve and the extent of its plateau changed according to the level of contamination. Increasing the oil content, the curve tends to a unimodal shape, with a behavior similar to granular soils. This statement was proved by the microstruture photographs, which showed an increase of sample porosity due to the increase of oil content. The time required to reach suction equilibrium during the tests varied between 7 to 30 days, according to the initial water content of the samples. The observed hysteresis had a small reduction with the increase of oil content. The control tests proved that oil evaporation and its absortion by the filter paper were insignificant in the whole test program.
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7

Roshani, Pedram. "The Effect of Temperature on the SWCC and Estimation of the SWCC from Moisture Profile under a Controlled Thermal Gradient." Thèse, Université d'Ottawa / University of Ottawa, 2014. http://hdl.handle.net/10393/31072.

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Анотація:
In many situations, the upper layers of soil above the ground water table are in a state of unsaturated condition. Although unsaturated soils are found throughout the world, they are predominant in arid or semi-arid regions. In these areas, the soil water characteristic curve (SWCC) which relates the water content to the matric suction could be used as key tool to implement the mechanics of unsaturated soils into the designs of geotechnical structures such as dams, embankments, pavements, canals, and foundations. Several experimental techniques are available for determining the SWCC in a laboratory environment. However, these experimental techniques are expensive, time consuming typically requiring days or weeks, depending on the soil type, and demanding intricate testing equipment. Due to these reasons, there has been a growing interest to find other means for estimating SWCC and encourage the adoption of unsaturated soils mechanics in geotechnical engineering practice. Several methods exist to indirectly estimate the SWCC from basic soil properties. Some may include statistical estimation of the water content at selected matric suction values, correlation of soil properties with the fitting parameters of an analytical equation that represents the SWCC, estimation of the SWCC using a physics-based conceptual model, and artificial intelligence methods such as neural networks or genetic programming. However, many studies have shown that environmental effects such as temperature, soil structure, initial water content, void ratio, stress history, compaction method, etc. can also affect the SWCC. This means that the estimation SWCC from set of conditions may not reliably predict the SWCC in other conditions. Due to this reason, it is crucial for engineers involved with unsaturated soils to take into account all the factors that influence the SWCC. The two key objectives of the present thesis are the development of a method based on first principles, using the capillary rise theory, to predict the variation of the SWCC as a function of temperature, as well as developing a technique for the prediction of the fixed parameters of a well-known function representing the SWCC based on basic soil properties together with the moisture profile of a soil column subjected to a known temperature gradient. A rational approach using capillary rise theory and the effect of temperature on surface tension and liquid density is developed to study the relation between temperature and the parameters of the Fredlund and Xing (1994) equation. Several tests, using a Tempe cell submerged in a controlled temperature bath, were performed to determine the SWCC of two coarse-grained soils at different temperatures. A good comparison between the predicted SWCC at different temperatures using the proposed model and the measured values from the Tempe cell test results is achieved. Within the scope of this thesis, a separate testing program was undertaken to indirectly estimate the SWCC of the same two coarse-grained soils from the measurement of their steady state soil-moisture profile while subjected to a fixed temperature differences. The water potential equation in the liquid and vapor phases is used to analyses the steady state flow conditions in the unsaturated soil. A good comparison is obtained for the SWCC estimated using this technique with the SWCC measured used a Tempe cell submerged in a controlled temperature bath. The results of this study indicate that knowledge of the moisture content of a soil specimen under a constant thermal gradient and basic soil properties can be used to estimate the SWCC of the soil at the desired temperature.
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Liu, Zhen. "Multiphysics Simulation and Innovative Characterization of Freezing Soils." Case Western Reserve University School of Graduate Studies / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=case1350331910.

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9

Silva, Angelita Martins da. "Banco de dados de curvas de retenção de água de solos brasileiros." Universidade de São Paulo, 2005. http://www.teses.usp.br/teses/disponiveis/18/18132/tde-27012006-043239/.

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A mecânica dos solos não saturados tem se tornado um importante tema de pesquisas dedicadas a entender o comportamento dos solos não saturados e otimizar sua utilização em várias obras civis. A curva de retenção de água, definida como a relação entre a sucção e a quantidade de água presente no solo, é considerada um elemento chave na interpretação do comportamento e propriedades dos solos não saturados tais como a condutividade hidráulica e a resistência ao cisalhamento. Este trabalho apresenta a estrutura de um banco de dados projetado para armazenar informações de solos brasileiros com enfoque nas características de retenção de água. O banco de dados inclui a curva de retenção e os parâmetros de ajuste das equações de van Genuchten (1980) e Fredlund & Xing (1994), assim como informações das características dos solos como índices físicos, classificações dos solos, análises granulométricas, índices de consistência e localização e estado da amostra. Além da estimativa da função condutividade hidráulica, o banco de dados oferece duas ferramentas que permitem a pesquisa rápida ou detalhada das informações e os dados armazenados podem ser mostrados na tela ou em relatórios impressos
Unsaturated soil mechanics has become an important subject of research devoted to understand the behavior of unsaturated soils and optimize their use in several civil works. The soil-water characteristic curve, defined as the relationship between the suction and the amount of water present in the soil, is considered as the key in the interpretation of the behavior and properties of unsaturated soils, such as the hydraulic conductivity and the shear strength. This paper presents the structure of a database designed to store information of brazilian soils with focus in the characteristics of water retention. The database includes the retention curves and the parameters of adjusted van Genuchten and Fredlund & Xing equations and also information of soil characteristics such as physical indexes, soil classifications, particle-size analysis, consistency indexes and location and kind of used samples. Beyond the estimate of hydraulic conductivity, the database presents two search tools that allow for quick and detailed recovering of information and stored data can be displayed on screen or in printed reports
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10

Feverharmel, Carolina. "Estudo da resistência ao cisalhamento e da condutividade hidráulica de solos coluvionares não saturados da Formação Serra Geral." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2007. http://hdl.handle.net/10183/13467.

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Esta tese apresenta um estudo sobre a resistência ao cisalhamento e a condutividade hidráulica de dois solos coluvionares não saturados situados na divisa dos estados do Rio Grande do Sul e Santa Catarina, em um dos trechos do Gasoduto Bolívia-Brasil. Esses solos são constituídos por sedimentos oriundos da Formação Serra Geral (basalto – Solo RO) e da Formação Botucatu (arenito – Solo AV). O trabalho de pesquisa realizado com esses solos tem seu enfoque dividido em duas partes principais: (1) obtenção direta da resistência ao cisalhamento e da função condutividade hidráulica em diferentes níveis de sucção, e (2) previsão indireta dessas propriedades a partir da determinação da curva característica do solo e de parâmetros geotécnicos saturados. As curvas características dos solos AV e RO, nas condições indeformada e remoldada (sem e com secagem prévia do solo), foram obtidas pelo uso combinado do método do papel filtro e da placa de sucção. Para as condições indeformada e remoldada sem secagem prévia, essas curvas exibiram um formato bimodal. A dessaturação é controlada pelos macroporos, para baixas sucções, e pelos microporos, para altas sucções. Para valores de sucção intermediários, praticamente não ocorre remoção de água do solo, devido, provavelmente, à ausência de poros com tamanho intermediário. Já as curvas características das amostras remoldadas com secagem prévia do solo tendem a apresentar um formato mais próximo do unimodal. A influência do índice de vazios inicial e da história de umedecimento e secagem no formato da curva é também discutida. A resistência ao cisalhamento dos solos estudados foi determinada em laboratório através de ensaios de cisalhamento direto convencionais e com sucção controlada. Os resultados, obtidos para amostras indeformadas e remoldadas sem secagem prévia, permitiram a determinação dos parâmetros de resistência ao cisalhamento c’, f’ e fb. Para determinação direta da função condutividade hidráulica do Solo AV foi construído um permeâmetro triaxial com controle de sucção, baseado no modelo apresentado por Huang et al. (1998). Esse equipamento foi utilizado para determinação da função condutividade hidráulica do Solo AV não saturado, em diferentes trajetórias de umedecimento e secagem. Os resultados evidenciaram que as amostras do Solo AV nas três condições de moldagem - indeformada, remoldada sem e com secagem - tendem a reproduzir o comportamento de dessaturação exibido nas curvas características. A função condutividade hidráulica apresenta inicialmente um decréscimo para sucções até 50 kPa, seguido por um valor praticamente constante, para sucções até 90 kPa.
This thesis presents a study about the shear strength and hydraulic conductivity of two unsaturated colluvium soils situated at the border between the states of Rio Grande do Sul and Santa Catarina, along one of the Bolivia-Brazil Gas Pipeline stretches. These soils are constituted by sediments originated from Serra Geral (basalt – sample RO) and Botucatu formations (sandstone - sample AV). The research performed with these soils had its focus divided in two main parts: (1) direct measurements of shear strength and hydraulic conductivity function at different suction levels and (2) indirect prediction of these properties from the soil-water characteristic curves and saturated geotechnical parameters. The soilwater characteristic curves of AV and RO Samples, in undisturbed and remolded conditions (without and with previous drying), were determined with both the filter-paper technique and the suction-plate technique. The undisturbed and remolded samples without previous drying showed a bimodal shape. The desaturation is controlled by the macropores for low suction values and by the micropores, for higher values. For intermediary suctions values, practically no removal of water from the sample occurs, possibly due to the lack of intermediate pore sizes. The remolded samples with previous drying tend to present a shape close to unimodal. The influences of void ratio and the drying and wetting history in the shape of the soil-water characteristic curve are also discussed. The shear strength of the studied soils was determined with conventional and suction-controlled direct shear tests. The results obtained for undisturbed and remolded samples without previous drying allowed the determination of shear strength parameters c’, f’ e fb. For the direct measurement of hydraulic conductivity function, a flexible-wall permeameter was built, based on the model presented by Huang et al. (1998). This equipment was used for determining the unsaturated hydraulic conductivity function of Sample AV in different drying and wetting paths. The results showed that Samples AV in the three molding conditions - undisturbed and remolded without and with previous drying – reproduced the desaturation behavior showed by the soil-water characteristic curves. The hydraulic conductivity function presents initially a decrease for suctions up to 50 kPa, followed by a practically constant value, for suctions up to 90 kPa.
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Частини книг з теми "SOIL-WATER CHARACTERISTICS CURE"

1

Leong, Eng-Choon, and Martin Wijaya. "Soil-water characteristic curve." In Laboratory Tests for Unsaturated Soils, 161–93. Boca Raton: CRC Press, 2023. http://dx.doi.org/10.1201/b22304-10.

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Bello, Nura, Alfrendo Satyanaga, Gerarldo Davin Aventian, Sung-Woo Moon, and Jong Kim. "Mathematical equations for modelling soil-water characteristic curve." In Smart Geotechnics for Smart Societies, 2378–84. London: CRC Press, 2023. http://dx.doi.org/10.1201/9781003299127-367.

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3

Sillers, W. Scott, Delwyn G. Fredlund, and Noshin Zakerzadeh. "Mathematical attributes of some soil—water characteristic curve models." In Unsaturated Soil Concepts and Their Application in Geotechnical Practice, 243–83. Dordrecht: Springer Netherlands, 2001. http://dx.doi.org/10.1007/978-94-015-9775-3_3.

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4

Lu, Youqian, Changfu Wei, Guoqing Cai, and Chenggang Zhao. "Study on the Soil Water Characteristic Curve and Shear Strength Characteristics of Granite Soil with Different Weathered Degree." In Proceedings of GeoShanghai 2018 International Conference: Multi-physics Processes in Soil Mechanics and Advances in Geotechnical Testing, 165–72. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-0095-0_19.

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Aung, K. K., H. Rahardjo, E. C. Leong, and D. G. Toll. "Relationship between porosimetry measurement and soil—water characteristic curve for an unsaturated residual soil." In Unsaturated Soil Concepts and Their Application in Geotechnical Practice, 401–16. Dordrecht: Springer Netherlands, 2001. http://dx.doi.org/10.1007/978-94-015-9775-3_9.

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Sitarenios, Panagiotis, Michael Bardanis, and Michael Kavvadas. "Evaluation of Various Soil-Water Characteristic Curve Models for Soils from Greece." In Unsaturated Soils: Research and Applications, 69–76. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-31343-1_9.

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Yan, Guanxi, Zi Li, Thierry Bore, Sergio Galindo-Torres, Stefan Schlaeger, Alexander Scheuermann, and Ling Li. "An Experimental Platform for Measuring Soil Water Characteristic Curve Under Transient Flow Conditions." In Advances in Laboratory Testing and Modelling of Soils and Shales (ATMSS), 231–38. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-52773-4_26.

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Chen, Hui, Chang-Fu Wei, Rong-Tao Yan, Pan Chen, and Pan-Pan Yi. "On The Determination of The Soil-Water Characteristic Curve Using The Pressure Plate Extrator." In Advances in Environmental Geotechnics, 511–14. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-04460-1_46.

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Elkady, Tamer Y., and Ahmed M. Al-Mahbashi. "Effect of Vertical Stress on the Soil Water Characteristic Curve of Highly Expansive Soils." In Unsaturated Soils: Research and Applications, 165–72. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-31116-1_22.

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Tuller, Markus, and Dani Or. "Soil water retention and characteristic curve." In Reference Module in Earth Systems and Environmental Sciences. Elsevier, 2022. http://dx.doi.org/10.1016/b978-0-12-822974-3.00105-1.

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Тези доповідей конференцій з теми "SOIL-WATER CHARACTERISTICS CURE"

1

Zapata, Claudia E., William N. Houston, Sandra L. Houston, and Kenneth D. Walsh. "Soil–Water Characteristic Curve Variability." In Geo-Denver 2000. Reston, VA: American Society of Civil Engineers, 2000. http://dx.doi.org/10.1061/40510(287)7.

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Zou, L., and E. C. Leong. "Soils with Bimodal Soil-Water Characteristic Curve." In Second Pan-American Conference on Unsaturated Soils. Reston, VA: American Society of Civil Engineers, 2018. http://dx.doi.org/10.1061/9780784481684.006.

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3

Mahabadi, Nariman, Dirk BeGell, Xianglei Zheng, Leon van Paassen, and Jaewon Jang. "The Soil Water Characteristic Curve for 3D Printed Soil Samples." In Second Pan-American Conference on Unsaturated Soils. Reston, VA: American Society of Civil Engineers, 2018. http://dx.doi.org/10.1061/9780784481684.008.

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Nishimura, T., Y. Murasawa, and T. Okami. "Estimating Air-Water Hydraulic Conductivity Using Soil-Water Characteristic Curve." In Fourth International Conference on Unsaturated Soils. Reston, VA: American Society of Civil Engineers, 2006. http://dx.doi.org/10.1061/40802(189)133.

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Miao, Linchang, Fei Jing, and Sandra L. Houston. "Soil-Water Characteristic Curve of Remolded Expansive Soils." In Fourth International Conference on Unsaturated Soils. Reston, VA: American Society of Civil Engineers, 2006. http://dx.doi.org/10.1061/40802(189)80.

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Liu, Zhen, and Xiong Yu. "Influence of Contact Angle on Soil-Water Characteristic Curve." In Geo-Congress 2014. Reston, VA: American Society of Civil Engineers, 2014. http://dx.doi.org/10.1061/9780784413272.402.

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Rojas, E., and F. Rojas. "A Probabilistic Model for the Soil-Water Characteristic Curve." In Fourth International Conference on Unsaturated Soils. Reston, VA: American Society of Civil Engineers, 2006. http://dx.doi.org/10.1061/40802(189)209.

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Yang, Heping, Cunran He, Jie Xiao, and Wentao Zhan. "Analysis on Improvement Effect of Expansive Soil by Soil-Water Characteristic Curve." In GeoHunan International Conference 2011. Reston, VA: American Society of Civil Engineers, 2011. http://dx.doi.org/10.1061/47633(412)36.

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Osinubi, K. J., and A. O. Eberemu. "Soil Water Characteristic Curve Parameters of Compacted Lateritic Soil Treated with Bagasse Ash." In GeoShanghai International Conference 2010. Reston, VA: American Society of Civil Engineers, 2010. http://dx.doi.org/10.1061/41103(376)11.

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Velasquez, Edgar Daniel Rodriguez, and Vladik Kreinovich. "Scale-Invariance Ideas Explain the Empirical Soil-Water Characteristic Curve." In 2020 IEEE Symposium Series on Computational Intelligence (SSCI). IEEE, 2020. http://dx.doi.org/10.1109/ssci47803.2020.9308136.

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