Tesis sobre el tema "Cohesive soils"
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Mobley, Thomas Jackson Melville Joel G. "Erodibility testing of cohesive soils". Auburn, Ala, 2009. http://hdl.handle.net/10415/1776.
Texto completoMattar, Joe. "An investigation of tunnel-soil-pile interaction in cohesive soils /". Thesis, McGill University, 2007. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=112577.
Texto completoKim, Dong Gyou. "Development of a constitutive model for resilient modulus of cohesive soils". Columbus, Ohio : Ohio State University, 2004. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1078246971.
Texto completoTitle from first page of PDF file. Document formatted into pages; contains xxvi, 252 p.; also includes graphics. Includes abstract and vita. Co-advisors: Frank M. Croft and Tarunja S. Batalia, Dept. of Civil Engineering. Includes bibliographical references (p. 122-131).
Beadle, Michael E. "Settlement induced by tunnelling in cohesive-frictional soils". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp04/mq21081.pdf.
Texto completoMostafa, Khaled F. "Numerical Modeling of Dynamic Compaction in Cohesive Soils". University of Akron / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=akron1286904792.
Texto completoAubeny, Charles Paul. "Rational interpretation of in-situ tests in cohesive soils". Thesis, Massachusetts Institute of Technology, 1992. http://hdl.handle.net/1721.1/13198.
Texto completoKwok, Leung Cheung. "A study of cohesive-frictional soils under dynamic loading". Thesis, University of Aberdeen, 2013. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=201916.
Texto completoTaylor, Paul. "Fast shearing of cohesive soils using ring shear apparatus". Thesis, University of Warwick, 1998. http://wrap.warwick.ac.uk/102336/.
Texto completoSalem, Hicham. "A Practical Approach to the Erodibility of Cohesive Soils". Thesis, Université d'Ottawa / University of Ottawa, 2019. http://hdl.handle.net/10393/39673.
Texto completoAkinola, Akinrotimi Idowu. "Temporal and Thermal Effects on Fluvial Erosion of Cohesive Streambank Soils". Diss., Virginia Tech, 2018. http://hdl.handle.net/10919/96768.
Texto completoPHD
Hairsine, Peter Brian y n/a. "A Physically Based Model of the Erosion of Cohesive Soils". Griffith University. Division of Australian Environmental Studies, 1988. http://www4.gu.edu.au:8080/adt-root/public/adt-QGU20050826.114613.
Texto completoWichtmann, Thorsten. "Explicit accumulation model for non-cohesive soils under cyclic loading /". Bochum : Inst. für Grundbau und Bodenmechanik, 2005. http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&doc_number=014636041&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA.
Texto completoButtress, Adam James. "Physicochemical behaviour of artificial lime stabilised sulfate bearing cohesive soils". Thesis, University of Nottingham, 2013. http://eprints.nottingham.ac.uk/14463/.
Texto completoMarjanovic, Jana. "Stiffness characterization of mechanically-compressed cohesive soils using wave propagation". Thesis, Massachusetts Institute of Technology, 2016. http://hdl.handle.net/1721.1/103837.
Texto completoCataloged from PDF version of thesis.
Includes bibliographical references (pages 291-302).
Wave propagation through soils is a non-destructive method used to characterize soil stiffness properties and is the basis for geophysical interpretations. Due to the difficulty of measuring shear waves through soft cohesive soils with ultrasonic transducers, bender elements are typically used, which couple to the soft clay. Unfortunately, the stress limitation of bender elements precludes it from testing above 1.5 MPa. A novel setup using ultrasonic transducers, with electronic conditioning, is developed in order to overcome the difficulties of transmitting a shear wave through a soft material. The successful fabrication of triaxial cell endcaps fitted with ultrasonic piezoceramic elements has enabled the measurement of compressional and shear wave velocity of clays over a wide stress range (0.5 - 10 MPa). This research compares the shear modulus measurements using three different technologies that encompass a stress range of 0.1 to 70 MPa. A variety of resedimented materials and plasticities are tested in order to characterize the Vp and Vs as a function of stress during K₀-consolidation. Resedimentation creates controlled, uniform specimens whose results can develop a backbone for velocity behavior independent of field heterogeneities and disturbance. The Vp and Vs results show different trends as a function of stress for the different plasticity materials. However, the Vp/Vs ratio, which is a common indicator of unloading and lithology, has a strong dependence on the liquid limit (wL). A model is developed to predict the Vp/Vs as a function of stress for a given wL. In addition to K₀ loading, the effects of unloading are investigated. Unloading introduces secondary compression, which significantly alters the stiffness results. A method is developed to integrate the secondary compression data with normally consolidated data based on the concept of apparent preconsolidation pressure. Finally, the dynamically-obtained stiffness parameters are compared to statically-obtained constrained modulus values from static compression. By using Gassmann's fluid substitution and a corrective X factor, a new technique is developed that can predict the dynamic bulk modulus based on the static CRS measurements.
by Jana Marjanovic.
Ph. D.
Lee, Jangguen. "The Behavior of Pore Water Pressure in Cohesive Subgrade Soils". The Ohio State University, 2003. http://rave.ohiolink.edu/etdc/view?acc_num=osu1364216774.
Texto completoHairsine, Peter Brian. "A Physically Based Model of the Erosion of Cohesive Soils". Thesis, Griffith University, 1988. http://hdl.handle.net/10072/366307.
Texto completoThesis (PhD Doctorate)
Doctor of Philosophy (PhD)
Division of Australian Environmental Studies
Science, Environment, Engineering and Technology
Full Text
Hers, Ian. "The analysis and interpretation of the cone pressuremeter in cohesive soils". Thesis, University of British Columbia, 1989. http://hdl.handle.net/2429/27884.
Texto completoApplied Science, Faculty of
Civil Engineering, Department of
Graduate
Santagata, Maria Caterina. "Factors affecting the initial stiffness and stiffness degradation of cohesive soils". Thesis, Massachusetts Institute of Technology, 1999. http://hdl.handle.net/1721.1/9663.
Texto completo"December, 1998."
Includes bibliographical references.
This research investigated the pre-failure stress-strain behavior of cohesive soils through an ex.tensive testing program conducted on Resedimented Boston Blue Clay (RBBC). The uniformity and reproducibility in the behavior of this soil permitted a detailed study of the role of the following factors on both initial stiffness and small strain (Ea
Ph.D.
Kim, Dong-Gyou. "Development of a constitutive model for resilient modulus of cohesive soils". The Ohio State University, 2004. http://rave.ohiolink.edu/etdc/view?acc_num=osu1078246971.
Texto completoBiswas, Sharbaree. "Study of cohesive soil-granular filter interaction incorporating critical hydraulic gradient and clogging". Access electronically, 2005. http://www.library.uow.edu.au/adt-NWU/public/adt-NWU20060221.100311/index.html.
Texto completoIbarra, Sandra. "A model of stress distribution and cracking in cohesive soils produced by simple tillage implements /". Thesis, McGill University, 2001. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=38205.
Texto completoThe problem was solved using fundamental principles of soil mechanics and force equilibrium analyzis. As a result, a mathematical model was developed which describes three failure zones within the cut soil volume. The model can be programmed into a computer to generate maps of normal and shear stresses to visualize the three failure zones.
The failure zones are the shear failure zone, the tensile fracturing zone and the no failure zone. The tensile fracturing zone is delimited by the tensile stress reaching the tensile strength of the soil at the given soil moisture content and soil density. The tensile strength of the soil was measured using an apparatus and method designed in this research.
The mathematical model gives an explanation of the mechanics of crumbling and the shape of the failed volume, but it does not give information concerning soil aggregate quality and arrangement within the soil furrow. Then, a method of analyzing the formed aggregates was developed which considers some soil physical properties of aggregates.
The study concluded that the smaller tool width and the smaller tool rake angle, among the ones used in this research, produced the most efficient geometry in producing the largest amount of soil break up, the most uniform aggregate formation and the most stable aggregate arrangement. The same tool geometry requires less energy per unit volume of soil disturbed. The best performance is produced at the lowest soil water content among those tested.
Katti, Dinesh Ramanath. "Modelling including associated testing of cohesive soil using disturbed state concept". Diss., The University of Arizona, 1991. http://hdl.handle.net/10150/185654.
Texto completoEkwue, E. I. "The influence of organic matter on the erodibility of non-cohesive soils". Thesis, Cranfield University, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.331935.
Texto completoLiao, Chung-Lon. "Applications of cone, vane and vane-cone to predict stress-strain behaviour of unsaturated cohesive soil". Thesis, McGill University, 1986. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=72788.
Texto completoKho, Kai Tze. "An experimental study of local scour around circular bridge piers in cohesive soils". Thesis, University of Newcastle Upon Tyne, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.407586.
Texto completoMarjanovic, Jana. "The study of shear and longitudinal velocity measurements of sands and cohesive soils". Thesis, Massachusetts Institute of Technology, 2012. http://hdl.handle.net/1721.1/74496.
Texto completoCataloged from PDF version of thesis.
Includes bibliographical references (p. 185-189).
This thesis evaluates some methods for the measurement of stiffness parameters of soils, with an emphasis on the use of bender element technology in obtaining the shear modulus. The experimental program consisted two primary stages. The beginning part of the experimentation was concerned with evaluating the behavior of bender elements, both free-standing and when applied to soil. For this case, experiments were performed on dry Ticino sand. It was concluded that the bender element tip geometry has a much greater impact than previously perceived, in particular with long, slender geometries sometimes creating directly-propagating compressional waves that interfere with the shear wave arrival detection. To reduce the uncertainty in signal interpretation, a specimen aspect ratio of 1 was adopted, with a minimum wavelength ratio of 2. The second part of the experimentation consisted of using bender elements on Boston Blue Clay, both intact samples as well as Resedimented Boston Blue Clay, created in the laboratory from processed powder. The results obtained from loading normally consolidated specimens were generally consistent and in good agreement with the literature. The unloading portion was observed to behaves differently as a function of maximum consolidation stress, with the shear modulus decreasing less during unloading as higher stress ranges are reached. In addition to the testing performed on soils, a parametric study was conducted on common materials including steel, aluminum, acrylic, and rubber in order to evaluate the results for stiffness parameters measured using extensometers, accelerometers, and ultrasonic P-wave transducers. With the conclusion of these experiments, the accelerometers were shown to have highly variable results, especially for shear wave velocity, while the other methods yielded relatively consistent, reliable results as compared to published values. Finally, a new design for a triaxial setup that enables integrated measurements of compressional and shear velocities in soil over a wide stress range is presented as groundwork for the characterization of the complete stiffness matrix of BBC.
by Jana Marjanovic.
S.M.
Viking, Kenneth. "Vibro-driveability -a field study of vibratory driven sheet piles in non-cohesive soils". Doctoral thesis, KTH, Civil and Architectural Engineering, 2002. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3358.
Texto completoHarris, Dustin T. "Numerical model evaluations of cumulative contraction scour at a bridge site with cohesive soils". Auburn, Ala., 2005. http://repo.lib.auburn.edu/2005%20Summer/master's/HARRIS_DUSTIN_57.pdf.
Texto completoAbstract. Vita. "References: Curry, J.E., S.H. Crim, O. Güven, J.G. Melville, and S. Santamaria, 2003. "Scour Evaluations of Two Bridge Sites in Alabama with Cohesive Soils," Highway Research Center 930-490R, October 2003, Auburn University, AL Includes bibliographic references.
Chang, E., E. Chang, J. Villalta, C. Fernandez y G. Duran. "Improvement of physical, mechanical and strength behavior of cohesive soils with natural pozzolana and brick dust". Institute of Physics Publishing, 2020. http://hdl.handle.net/10757/651792.
Texto completoAl-Yaseen, Muzher Alowan Hussain. "The influence of large-grained material on the initiation of scour in consolidated cohesive soils". Thesis, Cardiff University, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.276864.
Texto completoKassim, Kharul Anuar. "The geotechnical properties of lime and ash stabilised cohesive soils and their use in design". Thesis, University of Newcastle Upon Tyne, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.242369.
Texto completoZreik, Diana Alexandre 1966. "Behavior of cohesive soils and their drained, undrained, and erosional strengths at ultra-low stresses". Thesis, Massachusetts Institute of Technology, 1995. http://hdl.handle.net/1721.1/11725.
Texto completoVita.
Includes bibliographical references (v. 2, leaves 516-532).
by Diana Alexandre Zreik.
Ph.D.
Ghelardi, Veronica M. "Estimation of long term bridge pier scour in cohesive soils at Maryland bridges using EFA/SRICOS". College Park, Md. : University of Maryland, 2004. http://hdl.handle.net/1903/1816.
Texto completoThesis research directed by: Dept. of Civil and Environmental Engineering. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.
Yaman, Gokhan. "Prediction Of Geotechnical Properties Of Cohesive Soils From In-situ Tests: An Evaluation Of A Local Database". Master's thesis, METU, 2007. http://etd.lib.metu.edu.tr/upload/2/12608120/index.pdf.
Texto completoPressuremeter Test&rdquo
and &ldquo
Standard Penetration Test&rdquo
on cohesive materails. Over 350 standard penetration test results are recorded together with the pressuremeter results of relevant soils. Besides, the corresponding laboratory test results of oedometer, triaxial loading and all index properties of soils are assembled. The results of in-situ tests are evaluated together with the results of laboratory tests performed on the samples obtained from related sites. The correlations between in-situ &
laboratory test results on shear strength, compressibility and deformation characteristics of soils are analysed and compared with the existing correlations in literature. The correlations are generally obtained to be in agreement with the ones in common literature in cases where the soil conditions, particularly saturation, are same in both laboratory and in-situ tests.
Zreik, Diana Alexandre 1966. "Determination of the undrained shear strength of very soft cohesive soils by a new fall cone apparatus". Thesis, Massachusetts Institute of Technology, 1991. http://hdl.handle.net/1721.1/13399.
Texto completoWeidner, Katherine Lourene. "Evaluation of the Jet Test Method for determining the erosional properties of Cohesive Soils; A Numerical Approach". Thesis, Virginia Tech, 2012. http://hdl.handle.net/10919/72983.
Texto completoComputational Fluid Dynamics (CFD) can be used to determine the effect of scour hole shape changes on the applied shear stress. Previous calculation methods assumed that the depth of the scour hole was the only parameter that affected the applied shear stress. The analysis of the CFD models showed that depth did heavily influence the maximum shear stress applied to the soil boundary. However, the scour hole shape had an impact on the flow conditions near the jet centerline and within the scour hole. Wide, shallow holes yielded results that were similar to the flat plate, therefore it is recommended that field studies only use jet test results from wide, shallow holes to determine the coefficient of erodibility and the critical shear stress of cohesive soils.
Master of Science
Serdaroglu, Mehmet Serdar. "Nonlinear analysis of pile driving and ground vibrations in saturated cohesive soils using the finite element method". Diss., University of Iowa, 2010. https://ir.uiowa.edu/etd/882.
Texto completoGalli, Mario [Verfasser]. "Rheological Characterisation of Earth-Pressure-Balance (EPB) Support Medium composed of non-cohesive Soils and Foam / Mario Galli". Aachen : Shaker, 2016. http://d-nb.info/1118258533/34.
Texto completoVieira, Juliana Matos. "Contribution of low crystalline compounds and wetting and drying cycles in the genesis of the cohesive character in Cearà soils". Universidade Federal do CearÃ, 2013. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=10865.
Texto completoThe Coastal Plains exhibit cohesive soils, which can cause physical impediments to root penetration and water dynamics. However, in the genesis of these horizons are not completely understood. Thus, the aim of the present study was to evaluate the influence of amorphous compounds in the genesis of cohesive horizons in soils of different textures of the Coastal Plains of CearÃ, as well as verify, through physical behavior of these soils in the presence and absence of these compounds. This study also aimed to evaluate the influence of wetting and drying cycles in the density of these soils. To evaluate the effect of amorphous compounds in soil cohesion, we used samples from the air-dried cohesive horizons 9 soil profiles of the state of CearÃ, these being subjected to two treatments: with and without extraction of amorphous compounds. The samples (with and without extraction) were subjected to 3 cycles of wetting and drying, and subsequently, the penetration resistance (PR), hydraulic conductivity and bulk density were determined. To assess the influence of wetting and drying cycles in the density of these soils were performed 3 different levels of wetting and drying cycles (3, 6, 9 cycles). After these cycles, penetration resistance resistance and density were evaluated. The additions of silica and aluminum low crystalline (amorphous) in cohesive soils show that these compounds contribute jointly in the genesis of these horizons. Regardless of texture, soil that passed through the extraction process of amorphous compounds showed a significant reduction in soil resistance to penetration and density. It was found that these soils, the hydraulic conductivity was higher than that observed in soil without extraction of amorphous compounds. Thus, it is clear the contribution of these compounds in the hardening in cohesive soils. With regard to the effects of wetting and drying cycles assessed characteristics of the soil (RP and density), it was observed that in general, increasing the number of cycles caused a subtle increase in bulk density. Soils that have gone by 9 cycles of wetting and drying showed a remarkable increase in RP in relation to soils soils that have undergone 3and 6 cycles.
Os Tabuleiros Costeiros apresentam solos com carÃter coeso, os quais podem ocasionar impedimento fÃsico à penetraÃÃo das raÃzes e à dinÃmica da Ãgua. No entanto, a gÃnese desses horizontes nÃo està completamente esclarecida. Dessa forma, objetivou-se com o presente trabalho avaliar a influÃncia de compostos amorfos na gÃnese de horizontes com carÃter coeso em solos de diferentes texturas dos Tabuleiros Costeiros do CearÃ, bem como verificar, atravÃs de anÃlises fÃsicas o comportamento desses solos na presenÃa e na ausÃncia desses compostos. Objetivou-se tambÃm, avaliar a influÃncia de ciclos de umedecimento e secagem no adensamento desses solos. Para avaliaÃÃo do efeito dos compostos amorfos na coesÃo dos solos, foram utilizadas amostras de TFSA de horizontes com carÃter coeso de 9 perfis de solo do estado do CearÃ, sendo estas, submetidas a 2 tratamentos: com e sem extraÃÃo de compostos amorfos. As amostras (com e sem extraÃÃo) foram submetidas a 3 ciclos de umedecimento e secagem e, posteriormente, a resistÃncia à penetraÃÃo (RP), condutividade hidrÃulica e densidade do solo foram determinadas. Para avaliaÃÃo da influÃncia dos ciclos de umedecimento e secagem no adensamento desses solos, foram aplicados 3 diferentes nÃmeros de ciclos de umedecimento e secagem (3, 6, 9 ciclos). ApÃs esses ciclos, a resistÃncia do solo à penetraÃÃo e densidade foram avaliadas. Os acrÃscimos de sÃlica e de alumÃnio de baixa cristalinidade (amorfos) nos horizontes coesos evidenciam que esses compostos contribuem conjuntamente na gÃnese destes horizontes. Independente da textura, os solos que passaram pelo processo de extraÃÃo de compostos amorfos apresentaram uma reduÃÃo significativa na resistÃncia do solo à penetraÃÃo e na densidade. Verificou-se que nesses solos, a condutividade hidrÃulica foi superior Ãquela observada nos solos sem a extraÃÃo dos compostos amorfos. Desse modo, fica clara a contribuiÃÃo desses compostos no endurecimento dos solos coesos. No que se refere aos efeitos dos ciclos de umedecimento e secagem nas caracterÃsticas avaliadas do solo (RP e densidade), observou-se que de um modo geral, o aumento do nÃmero de ciclos provocou um sutil aumento na densidade do solo. Os solos que passaram pelos 9 ciclos de umedecimento e secagem apresentaram um aumento significativo na RP em relaÃÃo aos solos que solos que passaram por 3 e 6 ciclos.
Terceros, Almanza Mauricio Marcelo [Verfasser]. "A new p-y approach to pile foundations with arbitrary dimensions under monotonic load in cohesive soils / Mauricio Marcelo Terceros Almanza". Hannover : Gottfried Wilhelm Leibniz Universität, 2021. http://nbn-resolving.de/urn:nbn:de:101:1-2021093002162796802790.
Texto completoGalli, Mario [Verfasser], Markus [Gutachter] Thewes y Daniele [Gutachter] Peila. "Rheological characterisation of earth-pressure-balance (EPB) support medium composed of non-cohesive soils and foam / Mario Galli ; Gutachter: Markus Thewes, Daniele Peila". Bochum : Ruhr-Universität Bochum, 2016. http://d-nb.info/1114497002/34.
Texto completoLira, Rodolfho de Aquino. "Efeito do Uso sobre a Coesão de Solo Cultivado com Cana- de- Açúcar em Tabuleiro Costeiro de Pernambuco". Universidade Federal de Pernambuco, 2015. https://repositorio.ufpe.br/handle/123456789/16623.
Texto completoMade available in DSpace on 2016-04-15T15:13:59Z (GMT). No. of bitstreams: 2 license_rdf: 1232 bytes, checksum: 66e71c371cc565284e70f40736c94386 (MD5) Dissertação-RODOLFHO.pdf: 972823 bytes, checksum: c6ed8f08ace41c1927e4fd841d1b0cc4 (MD5) Previous issue date: 2015-07-09
FACEPE
Os tabuleiros costeiros ocupam uma extensa área no litoral brasileiro e devido a seu relevo plano favorável à mecanização, precipitação pluvial alta e proximidade com os grandes centros consumidores, são as áreas de uso agrícola mais intensificado. Os solos predominantes nessa área são em geral, profundos, de baixa fertilidade natural e muitas vezes ocorrem com uma camada adensada, configurando os solos coesos. Esta coesão tem afetado propriedades físicas, químicas e hídricas do solo, que interferem diretamente no estabelecimento do cultivo e, consequentemente, na produtividade das culturas e renda dos agricultores. Os agricultores, em situações como esta, muitas vezes tendem a desmatarem mais áreas para cultivo, visando compensar perdas econômicas, causando impactos ambientais. O objetivo deste estudo foi avaliar o efeito do uso, sobre a resistência no horizonte coeso, em solos sob manejo de cana-de-açúcar e mata nativa, na unidade geoambiental dos Tabuleiros Costeiros de Pernambuco, a partir de ensaios físico-hídricos. Foram abertos um perfil em área de plantio de cana-de-açúcar e um em mata nativa, e coletadas amostras estruturadas do horizonte coeso. Os atributos físicos avaliados foram: Porosidade Total (macro, meso, micro e criptoporosidade), densidade do solo (Ds), curva característica de retenção de água no solo (CCRAS) e resistência do solo à penetração de raízes (RP). As médias dos parâmetros físicos analisados foram submetidas à análise de variância (ANOVA) e para os parâmetros que apresentam diferenças significativas foi aplicado o teste de Tukey, por meio do aplicativo SAS. A resistência à penetração foi um atributo eficiente para avaliar coesão dos solos estudados. Os manejos distintos não apresentaram diferença significativa nos valores de densidade Ds. A área cultivada apresentou maior capacidade de retenção de água, avaliada pelas curvas características de retenção, evidenciando que o manejo influenciou no tamanho dos poros. Na área de mata poderá ocorrer maior secamento do solo, sem que haja valores restritivos de resistência à penetração, pois precisará de um menor valor de umidade para que não haja impedimentos ao desenvolvimento do sistema radicular.
The costal plains occupates an extensive area in brazilian’s litoral and due to its plain relief suitable to mechanization, high pluvial precipitation and proximity with the big consumer centers, are intensified agricultural areas. The predominant soils in this area are in general, deep, of low natural fertility and most of the times occur with a condensed layer, setting the cohesive soils. This cohesion has affected physical, chemical and hydrous properties of the soil, which interfere directly in the settlement of the cultivation and, consequently, in the crops productivity and income of the farmers. The farmers, in situations like this, many times tend to deforest more areas to cultivation, aiming to compensate economic losses, causing environmental damage. The goal of this study was to evaluate the effect of the use in the resistance of the cohesive horizon, on soils under management of sugar cane and native forest in the geo environmental unit of the coastal plains of Pernambuco, from hydrous physical tests. It was opened a profile in the sugarcane area and another native forest, structured and collected samples of cohesive horizon. The assessed physical attributes were: Total porosity (macro, meso, micro and criptoporosidade), bulk density (Ds), water retention curve characteristic in the soil (CCRAS) and soil resistance to root penetration (RP). The average of the physical parameters analyzed were subjected to analysis of variance (ANOVA) and to the parameters that show significant differences was used the Tukey test, using the SAS software. The penetration resistance was an effective attribute to evaluate the cohesion of soils studied. The different managements showed no significant difference in density values Ds. The crapped area presented higher water holding capacity, when evaluated by retention curves, showing that the management influenced the pore size. In forest area may occur more soil drying, without restrictive values of penetration resistance because need a lower moisture value so there are no impediments to the development of the root system.
Hazell, Edmund. "Numerical and experimental studies of shallow cone penetration in clay". Thesis, University of Oxford, 2008. http://ora.ox.ac.uk/objects/uuid:6b5380f1-2d02-4da0-92e0-ae83ad5c4698.
Texto completoZuffo, Valmir José. "Efeitos de diferentes preparos nos atributos físicos do solo e no desempenho produtivo do mamoeiro Tainung 01". Universidade Federal do Espírito Santo, 2012. http://repositorio.ufes.br/handle/10/5590.
Texto completoAvaliaram-se os efeitos de cinco sistemas de preparo do solo nos atributos físicos de um Argissolo Amarelo coeso de Tabuleiro, bem como no crescimento, desenvolvimento e nutrição do mamoeiro Formosa Tainung 01 irrigado. O experimento foi instalado em 21/01/2011 e conduzido a campo por 260 dias, em área anteriormente utilizada com pastagem de Brachiaria nunca corrigida ou fertilizada, irrigada por sistema de aspersão de baixa pressão. Os tratamentos, implantados em cinco repetições e em delineamento de blocos ao acaso foram: 1) grade aradora (duas vezes) + niveladora + camalhão sobre a linha confeccionado 135 após transplantio (GA c/ CAM); 2) grade aradora (duas vezes) + niveladora (GA s/ CAM); 3) subsolador florestal (SF); 4) grade aradora (duas vezes) + niveladora + escarificação com 3 hastes sobre a linha de plantio (GA + ELP); 5) grade aradora (duas vezes) + niveladora + escarificação com 3 hastes em área total (GA + EAT). Os preparos receberam sulcamento mecanizado e banquetas, confeccionadas manualmente com terra solta do sulco, que foram niveladas e fertilizadas para receber as mudas. Antes da implantação dos tratamentos a área experimental foi caracterizada quanto à resistência mecânica à penetração (RP) acompanhada pela umidade do solo, diâmetro médio ponderado (DMP), diâmetro médio geométrico (DMG), densidade do solo (Ds), macroporosidade (Ma), microporosidade (Mi), relação Ma/Mi, textura do solo e fertilidade. Após a implantação dos tratamentos foram determinadas RP, acompanhada pela umidade do solo, DMP, DMG, Ds, Ma, Mi, relação Ma/Mi e variáveis biométricas de nutrição e produção como altura de plantas, diâmetro do tronco a 0,20 m de altura, altura de inserção do primeiro fruto, sexo das plantas, teores foliares de macro e micronutrientes bem como número de frutos por planta com separação de frutos comerciais e não comerciais. O tratamento estatístico dos dados constou de cálculo do erro padrão da média para os dados de RP e para os demais dados, análise de variância e teste de Tukey a nível de 5% de probabilidade. Houve diferenças de resistência à penetração entre os tratamentos. O subsolador mostrou-se mais efetivo na diminuição da RP até 0,35 m de distância da planta no sentido transversal à linha de plantio. O escarificador resultou em menores RP do que GA ou SF, mesmo a 0,40 m de profundidade, e foi mais eficiente a maiores distâncias transversalmente à planta. Todos os preparos provocaram RP menores do que 2,5 MPa na profundidade de maior concentração de raízes do mamoeiro (0 0,25 m) fornecendo boas condições físicas até essa profundidade. Não houve diferença estatística entre os tratamentos para Ds, Ma, Mi, relação Ma/Mi, DMP e DMG a 0,20 m de profundidade e teores foliares de macro e micronutrientes aos 197 dias após transplantio. A altura de plantas em duas épocas foi menor para o SF e igual estatisticamente para os outros tratamentos. A grade aradora alterou os atributos físicos do solo em maior intensidade até 0,20 m de profundidade. A produção total de frutos e de frutos comerciais foi maior nos preparos GA c/ CAM, GA s/ CAM, GA+ELP e GA+EAT, os quais não diferiram entre si. Não houve diferenças para produtividade de frutos não comerciais. Não se justificou o uso do camalhão sobre a linha de plantio confeccionado após o transplantio. Do ponto de vista de conservação do solo, quando considerados os dados de estabilidade de agregados, os preparos foram semelhantes. A relação entre o crescimento e desenvolvimento das plantas e diferentes preparos de solo deve ser avaliada considerando o conjunto de atributos físicos e químicos do solo
The effects of five tillage systems on soil physical attributes, growth, development and nutrition of Formosa papaya Tainung 01 were evaluated on cohesive Alfisol of Coastal Tableland. The experiment was planted on january 21, 2011 and remained in field for 260 days, in an area previously used with Brachiaria never corrected nor fertilized before and irrigated by low pressure sprinkler system. Treatments were applied in five replicates and statistical design of random blocks were: 1) heavy disc harrow (twice) + offset disc harrow + ridge on row planting made 135 days after transplanting (GA c/ CAM); 2) heavy disc harrow (twice) + offset disc harrow (GA s/ CAM); 3) forester subsoiler (SF); 4) heavy disc harrow (twice) + offset disc harrow + chisel plow on row planting (GA+ELP); 5) heavy disc harrow (twice) + offset disc harrow + chisel plow on total area (GA+EAT). All tillage systems received mechanized furrower and a bench made with loose soil and fertilizers and over which the seedlings were planted. As a characterization of experimental area before application of treatments, were determined penetration resistance (RP) followed by soil moisture, mean weight diameter (DMP), geometric mean diameter (DMG), bulk density (Ds), macroporosity (Ma), microporosity (Mi), Ma/Mi ratio, soil texture and fertility. After application of treatments were determined RP, accompanied by soil moisture, DMP, DMG, Ds, Ma, Mi and Ma/Mi ratio and biometric variables of nutrition and production as plant height, stem diameter at 0,20 m height, height of insertion of the first fruit, plant sex, foliar contents of macro and micronutrients as well as number of fruits per plant with separation of commercial and non-commercial ones. Statistical treatment of data included calculation of mean standard error for RP and analysis of variance for all other data accompanied by the Tukey test for comparison of means at 5% level of probability. There were differences in penetration resistance between treatments. Subsoiler showed to be more effective in the decrease of RP up to 0,35 m away from the plant in the direction transverse to the rows. Chisel plow produced smaller RP than GA or SF, even at 0,40 m depth and was more effective at greater distances from the plant. All tillage systems produced RP smaller than 2.5 MPa at a depth with the greater concentration of papaya roots (0 0.25 m) and provided good physical conditions up to this depth. There was no statistical difference between treatments for Ds, Ma, Mi, Ma/Mi ratio, DMP e DMG at 0.20 m depth and foliar contents of macro and micronutrients at 197 days after transplanting. Height of plants in two stages were lower for the SF and statistically equal to the other treatments. Heavy disc harrow altered soil physical attributes at a higher intensity up to 0.20 m depht. Total fruit yield and commercial fruit yield was higher in GA c/ CAM, GA s/ CAM, GA+ELP and GA+EAT, which did not differ. There were no differences for non-commercial fruit yield. There was no justification for the building of the ridge on the planting row after instalation of the orchard. From the standpoint of conservation of soil, when considering the stability of aggregates data, all tillage systems were similar. The relationship between growth and development performance of plants and tillage systems should be evaluated considering whole physical and chemical properties of soil
VASCONCELOS, Romero Falcão Bezerra de. "Comportamento mecânico de um Latossolo Amarelo Distrocoeso não saturado sob diferentes sistemas de manejo culturais da cana-de-açúca". Universidade Federal Rural de Pernambuco, 2009. http://www.tede2.ufrpe.br:8080/tede2/handle/tede2/5378.
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The soils of the Coastal Plains cultivated with sugarcane for a long period of time under different management systems may make changes in physical and chemical properties and the state of soil aggregation. Considering the above, the objective of this study was to evaluate the effects of different management systems with sugarcane on the chemical and physical properties of a dystrophic cohesive Yellow Latosol of coastal tablelands of Alagoas. Plots were selected in areas of production in the growing of sugarcane, and the object of experimental research three areas, representative of three management systems adopted by sugarcane production unit, namely: a cultivated area under irrigation management system (SMI), an area under the management system of fertirrigation with vinasse (SMV) and area under a management system with application of vinasse + filter tart (SMVT). These management systems were compared and on the witness pattern represented by native forest (NF). To assess the physical and chemical properties and aggregation state of the soil, the soil samples were collected at random in the areas subject to different management systems, in the depths of 0- 0,20; 0,20-0,40 and 0,40-0,60 m, being withdrawn at a point between the lines of sugarcane. The results were submitted to analysis of variance and the averages compared by Tukey test to 5% significance. Study of simple correlations were performed between some variables measures. The results showed that the different management systems promoted investigated changes in physical and chemical properties and the state of soil aggregation. The parameters of consistency of the soil tended to increase the humidity in their values with the increase of total organic carbon (TOC) of soil, promoted by the addition of waste from sugar cane. The studies of simple correlations between the total organic carbon (TOC) and the rates of stability of aggregate investigated, showed significant (p<0,01) correlation and positive. The management systems that received the addition of waste from sugarcane showed less deterioration in physical and chemical properties of soil in the soil under native forest (NF).
Os solos dos tabuleiros costeiros cultivados com cana-de-açúcar, durante longo período de tempo, sob diferentes sistemas de manejo, podem apresentar alterações nas propriedades físicas e químicas e no estado de agregação. O objetivo do trabalho foi avaliar os efeitos de diferentes sistemas de manejo com cana-de-açúcar sobre as propriedades físicas e químicas de um Latossolo Amarelo Distrocoeso dos tabuleiros costeiros de Alagoas. Foram selecionadas áreas em talhões de produção com a cultura da cana-de-açucar, sendo objeto de pesquisa experimental três áreas, representativas de três sistemas de manejo adotados pela unidade sucroalcooleira, a saber: uma área cultivada sob sistema de manejo irrigado (SMI), uma área sob sistema de manejo de fertirrigação com vinhaça (SMV) e uma área sob sistema de manejo com aplicação de vinhaça + torta de filtro (SMVT). Esses sistemas de manejo foram comparados entre si e em relação a uma testemunha padrão, representada por uma mata nativa (MN). Para avaliar as propriedades físicas e químicas e o estado de agregação do solo, amostras de solo foram coletadas ao acaso, nas áreas submetidas aos diferentes sistemas de manejo, nas profundidades de 0-0,20; 0,20-0,40 e 0,40-0,60 metros, sendo retiradas num ponto situado nas entrelinhas da cana-de-açúcar. Os resultados obtidos foram submetidos a análise de variância e as médias comparadas pelo teste de Tukey, a 5% de significância. Estudos de correlações simples foram realizados entre algumas variáveis medidas. Os resultados permitiram concluir que os diferentes sistemas de manejo investigados promoveram alterações nas propriedades físicas e químicas e no estado de agregação do solo. Os parâmetros de consistência do solo apresentaram tendência de aumento em seus valores de umidade com o incremento do carbono orgânico total (COT) do solo, promovido pela adição de resíduos da cana-de-açúcar. Os estudos de correlações simples entre o carbono orgânico total (COT) e os índices de estabilidade de agregados investigados apresentaram correlações significativas (p<0,01) e positivas. Os sistemas de manejo que receberam adição de resíduos da cana-de-açúcar denotaram menor degradação nas propriedades físicas e químicas do solo, em relação ao solo sob mata nativa (MN).
Santos, Joildes Brasil. "Parâmetros físico-ambientais para compartimentação geoambiental e delimitação da ocorrência de solos coesos na depressão do São Francisco, BA". Universidade Federal de Goiás, 2014. http://repositorio.bc.ufg.br/tede/handle/tede/4645.
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Conselho Nacional de Pesquisa e Desenvolvimento Científico e Tecnológico - CNPq
Studies on cohesive soils in Brazil and worldwide indicate that cohesion in the soil is a factor of natural limitation to agricultural use. However, in the region of the Coastal Tablelands in Northeast Brazil these soils are used through use and management techniques adapted to their natural limitations, such as high resistance to penetration, hard when dry and friable when moist, with high density and reduced effective depth, depending of dense horizon. As for the cohesion process in the soil, would be related to the accumulation clay soil filling the pores and increase its density, making them more resistant to penetration of roots. The silicification process could also be related to the formation of cohesive horizon because that silica is one of the principal cementing agents in this process in various regions of the planet. In addition, climate alternating between dry season and wet season this would also enhance soil compaction. In this study we discuss the presence of soils with cohesive horizon in Oxisols and Ultisols Yellow Yellows geomorphological unit called Depression of the San Francisco-BA, focusing on the area of the snail farm that featured a soil survey in detail. From a geo-environmental partitioning was presented a summary with the main features of the landscape, in order to understand the environment in which this type of soil occurs. And with the help of physical and environmental parameters of the relief (hipsometria, slope and curvature of the sides), use and vegetation and soil properties (isovalue of clay and silica content), it was possible to create a map with the location of the area with potential occurrence of cohesive soils for Farm Caracol, which certainly extends outside its boundaries.
Estudos sobre solos coesos no Brasil e no mundo apontam que a coesão no solo é um fator de limitação natural à utilização agrícola. Entretanto, na região dos Tabuleiros Costeiros no Nordeste Brasileiro esses solos são utilizados mediante técnicas de uso e manejo adaptados às suas limitações naturais, como alta resistência a penetração, duro quando secos e friáveis quando umedecidos, com alta densidade e profundidade efetiva diminuída, em função de horizonte adensado. Quanto ao processo de coesão no solo, estaria relacionado ao acúmulo de argila preenchendo os poros do solo e aumentando sua densidade, tornando-os mais resistentes à penetração de raízes. O processo de silicificação também poderia ser relacionado à formação do horizonte coeso, pois que a sílica é um dos principais agentes cimentantes nesse processo em várias regiões do planeta. Em adição, a alternância climática entre estação seca e estação úmida também intensificaria esse adensamento do solo. Nesta pesquisa é discutida a presença de solos com horizonte coeso em Latossolos Amarelos e Argissolos Amarelos da Unidade Geomorfológica denominada Depressão do São Francisco-BA, com foco na área da Fazenda Caracol que contou com um levantamento de solos em detalhe. A partir de uma compartimentação geoambiental foi apresentada uma síntese com as principais características físicas da paisagem, com o objetivo de entender o ambiente em que esse tipo de solo ocorre. E com auxílio de parâmetros físico-ambientais do relevo (hipsometria, declividade e curvatura das vertentes), do uso e vegetação e alguns atributos do solo (isovalores dos teores de argila e sílica), foi possível criar um mapa com a localização da área com potencial de ocorrência dos solos coesos para a Fazenda Caracol, a qual certamente se prolonga para fora de seus limites.
Muller, Eugene 1951. "In situ measurement of the cohesion of a cemented alluvial soil". Thesis, The University of Arizona, 1989. http://hdl.handle.net/10150/277090.
Texto completoParks, Olivia Waverly. "Effect of water temperature on cohesive soil erosion". Thesis, Virginia Tech, 2013. http://hdl.handle.net/10919/49663.
Texto completoeffect of water temperature on cohesive soil erosion should be explored. The objectives of this study are to: determine the effect of water temperature on the erosion rates of clay; determine how erosion rates vary with clay mineralogy; and, explore the relationship between zeta potential and erosion rate. Samples of kaolinite- and montmorillonite-sand mixtures, and vermiculite-dominated soil were placed in the wall of a recirculating flume channel using a vertical sample orientation. Erosion rate was measured under a range of shear stresses (0.1-20 Pa) for a period of five minutes per shear stress at water temperatures of 12, 20, and 27�"C. The zeta potential was determined for each clay type at the three testing temperatures and compared to mean erosion rates. The kaolinite erosion rate doubled when the temperature increased from 12 to 20�"C, and erosion of vermiculite samples tripled when the temperature increased from 20 to 27�"C. The montmorillonite samples generally eroded through mechanical failure rather than fluvial erosion, and the limited fluvial erosion of the montmorillonite-sand mixture was not correlated with water temperature. The data suggest correlation between zeta potential and erosion rate; however, due to the small sample size (n=3), statistically significant correlation was not indicated. Research should continue to explore the influence of water temperature on cohesive soil erosion to better understand the influence of clay mineralogy. Due to the high degree of variability in cohesive soil erosion, multiple replications should be used in future work. The vertical sample orientation enabled discrimination between fluvial erosion and mass wasting and is recommended for future studies.
Master of Science
Khasawneh, Mohammad Ali. "LABORATORY CHARACTERIZATION OF COHESIVE SUBGRADE MATERIALS". University of Akron / OhioLINK, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=akron1124387175.
Texto completoIngram, Ronald J. "Geosynthetic-soil interface properties for cohesionless and cohesive media". Morgantown, W. Va. : [West Virginia University Libraries], 2006. https://eidr.wvu.edu/etd/documentdata.eTD?documentid=4813.
Texto completoTitle from document title page. Document formatted into pages; contains xv, 150 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 137-140).