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Fan, Tailin. "Multi-plate penetration tests to determine soil stiffness moduli". Thesis, McGill University, 1985. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=63172.
Pełny tekst źródłaFinke, Kimberly Ann. "Piezocone penetration testing in Piedmont residual soils". Thesis, Georgia Institute of Technology, 1998. http://hdl.handle.net/1853/21452.
Pełny tekst źródłaBrown, Douglas Neil. "The prediction of clay soil properties using the piezocone penetration test". Thesis, Georgia Institute of Technology, 1993. http://hdl.handle.net/1853/20969.
Pełny tekst źródłaLee, Wai-ming. "Correlation of PCPT and SPT data from a shallow marine site investigation /". View the Table of Contents & Abstract, 2004. http://sunzi.lib.hku.hk/hkuto/record/B30110385.
Pełny tekst źródłaLee, Wai-ming, i 李慧明. "Correlation of PCPT and SPT data from a shallow marine site investigation". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2004. http://hub.hku.hk/bib/B44570077.
Pełny tekst źródłaCargill, Patrick Ethan. "The influence of friction sleeve roughness on cone penetration test measurements". Thesis, Georgia Institute of Technology, 1999. http://hdl.handle.net/1853/23002.
Pełny tekst źródłaWong, Kan-hok Ken. "Review of Menard pressuremeter test in weak rocks". Click to view the E-thesis via HKUTO, 2003. http://sunzi.lib.hku.hk/hkuto/record/B4257724X.
Pełny tekst źródłaTeeter, Russell Daniel. "Two dimensional mesoscale simulations of projectile instability during penetration of dry sand". Online access for everyone, 2007. http://www.dissertations.wsu.edu/Thesis/Fall2007/r_teeter_121107.pdf.
Pełny tekst źródłaYang, Wenwei. "Development and application of automatic monitoring system for standard penetration test in site investigation". Click to view the E-thesis via HKUTO, 2006. http://sunzi.lib.hku.hk/hkuto/record/B36811919.
Pełny tekst źródłaWong, Kan-hok Ken, i 王勤學. "Review of Menard pressuremeter test in weak rocks". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2003. http://hub.hku.hk/bib/B4257724X.
Pełny tekst źródłaEid, Walid Khaled. "Scaling effect in cone penetration testing in sand". Diss., Virginia Polytechnic Institute and State University, 1987. http://hdl.handle.net/10919/49849.
Pełny tekst źródłaPh. D.
incomplete_metadata
Greig, James William. "Estimating undrained shear strength of clay from cone penetration tests". Thesis, University of British Columbia, 1985. http://hdl.handle.net/2429/25076.
Pełny tekst źródłaApplied Science, Faculty of
Civil Engineering, Department of
Graduate
Chu, Lap-man Raymond. "Material identification and subsurface stratigraphy of Penny's Bay reclamation site : by the method of subsurface exploration : piezocone penetration test and drilling /". Click to view the E-thesis via HKUTO, 2002. http://sunzi.lib.hku.hk/hkuto/record/B42576660.
Pełny tekst źródłaZhuang, Peizhi. "Cavity expansion analysis with applications to cone penetration test and root-soil interaction". Thesis, University of Nottingham, 2017. http://eprints.nottingham.ac.uk/42772/.
Pełny tekst źródłaRahardjo, Paulus P. "Evaluation of liquefaction potential of silty sand based on Cone Penetration Test". Diss., Virginia Polytechnic Institute and State University, 1989. http://hdl.handle.net/10919/53844.
Pełny tekst źródłaPh. D.
Yang, Wenwei, i 楊文衛. "Development and application of automatic monitoring system for standard penetration test in site investigation". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2006. http://hub.hku.hk/bib/B36811919.
Pełny tekst źródłaNciizah, Adornis Dakarai. "Cattle manure, scalping and soil wetness effects on some physical properties of a hardsetting soil and associated early maize growth". Thesis, University of Fort Hare, 2011. http://hdl.handle.net/10353/349.
Pełny tekst źródłaFransson, Johan. "A study of the correlation between soil-rock sounding and column penetration test data". Thesis, KTH, Jord- och bergmekanik, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-40853.
Pełny tekst źródłaLu, Dandan, i 卢丹丹. "Effects of static pile penetration on an adjacent earth retaining structure". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2011. http://hub.hku.hk/bib/B47054670.
Pełny tekst źródłaMo, Pin-Qiang. "Centrifuge modelling and analytical solutions for the cone penetration test in layered soils". Thesis, University of Nottingham, 2014. http://eprints.nottingham.ac.uk/14319/.
Pełny tekst źródłaOzan, Cem. "Estimation Of Grain Characteristics Of Soils By Using Cone Penetration Test (cpt) Data". Master's thesis, METU, 2003. http://etd.lib.metu.edu.tr/upload/1088988/index.pdf.
Pełny tekst źródłaSun, Tek-kei, i 孫廸麒. "Numerical modeling of skin friction and penetration problems in geotechnical engineering". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2013. http://hdl.handle.net/10722/195991.
Pełny tekst źródłapublished_or_final_version
Civil Engineering
Doctoral
Doctor of Philosophy
Liao, Tianfei. "Post processing of cone penetration data for assessing seismic ground hazards, with application to the New Madrid seismic zone". Diss., Available online, Georgia Institute of Technology, 2005, 2005. http://etd.gatech.edu/theses/available/etd-05042005-133640/.
Pełny tekst źródłaMayne, Paul W., Committee Chair ; Goldsman, David, Committee Member ; Lai, James, Committee Member ; Rix, Glenn J., Committee Member ; Santamarina, J. Carlos, Committee Member.
Wang, Chwen-Huan. "Prediction of the residual strength of liquefied soils /". Thesis, Connect to this title online; UW restricted, 2003. http://hdl.handle.net/1773/10138.
Pełny tekst źródłaSchneider, James A. "Liquefaction response of soils in Mid-America evaluated by seismic cone tests". Thesis, Georgia Institute of Technology, 1999. http://hdl.handle.net/1853/20147.
Pełny tekst źródłaPerez, Waldo Flores, Jorge Chavez Cerdena, Gary Duran Ramirez i Maggie Martinelli Montoya. "Correlation of dynamic probing light (DPL) and standard penetration test (SPT) for sandy soil of alluvial origin". Institute of Electrical and Electronics Engineers Inc, 2020. http://hdl.handle.net/10757/656568.
Pełny tekst źródłaIn geotechnical studies, the dynamic probing light (DPL) turns out to be an alternative method to the Standard Penetration test (SPT) for the determination of soil parameters. The requirement of various regulations for correlating both tests in the same field and not establishing a methodology to carry it out, limits the practical scope of dynamic probing light. Thus, this research presents a correlation methodology between the dynamic probing light (DPL) and the Standard Penetration test (SPT) specifically for sandy soils (SP and SP-SM) located in an area of Chilca, located in Cañete. - Lima Peru. For the analysis, more than 400 data pairs were used, obtaining two linear correlations between the count blow of Standard Penetration-NSPT test and the dynamic probing light method-N10, which presented an adjustment correlation between 84% and 87 %.
Chu, Lap-man Raymond, i 朱立民. "Material identification and subsurface stratigraphy of Penny's Bay reclamation site: by the method of subsurfaceexploration : piezocone penetration test and drilling". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2002. http://hub.hku.hk/bib/B42576660.
Pełny tekst źródłaMupambwa, Hupenyu Allan. "Winter rotational cover crops effects on soil strength, aggregate stability and water conservation of a hardsetting cambisol in Eastern Cape Province, South Africa". Thesis, University of Fort Hare, 2012. http://hdl.handle.net/10353/453.
Pełny tekst źródłaMcGillivray, Alexander Vamie. "Enhanced Integration of Shear Wave Velocity Profiling in Direct-Push Site Characterization Systems". Diss., Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/19714.
Pełny tekst źródłaChung, Shin Fun. "Characterisation of soft soils for deep water developments". University of Western Australia. School of Civil and Resource Engineering, 2005. http://theses.library.uwa.edu.au/adt-WU2005.0079.
Pełny tekst źródłaLow, Han Eng. "Performance of penetrometers in deepwater soft soil characterisation". University of Western Australia. School of Civil and Resource Engineering, 2009. http://theses.library.uwa.edu.au/adt-WU2010.0008.
Pełny tekst źródłaSchneider, James A. "Analysis of piezocone data for displacement pile design". University of Western Australia. School of Civil and Resource Engineeringd%695 Electronic theses, 2008. http://theses.library.uwa.edu.au/adt-WU2008.0207.
Pełny tekst źródłaHolko, Jeffrey M. "Shear Strength Correlations for Ohio Highway Embankment Soils". Ohio University / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1205248711.
Pełny tekst źródłaYaman, 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.
Pełny tekst źródłaPressuremeter 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.
Peri, Elena. "An investigation on the behaviour of a shallow foundation resting on a layered soil near a slope". Master's thesis, Alma Mater Studiorum - Università di Bologna, 2016.
Znajdź pełny tekst źródłaAvila, Iana Carmem de Souza e. Silva. "Caracterização preliminar do subsolo da área urbana de Boa Vista-RR, a partir de sondagens de simples reconhecimento". Universidade Federal de Roraima, 2007. http://www.bdtd.ufrr.br/tde_busca/arquivo.php?codArquivo=40.
Pełny tekst źródłaO trabalho foi desenvolvido na área urbana de Boa Vista, as variáveis estudadas foram: altitude, nível da água e limite de sondagem objetivando a caracterização preliminar do subsolo de Boa Vista, através de sondagens de simples reconhecimento. Foram utilizados 75 pontos dos quais 47 do banco de dados da empresa A.P. Engenharia e RC engenharia nos anos de 1994 à 2007 e mais 28 dados levantados durante a pesquisa. Foi realizado a análise multivariada para o conhecimento de padrões não supervisionados as técnicas de Análise de Componentes Hierárquicos confirmados pela Análise de Componentes Principais. Com isto foram identificadas 3 Zonas para a Cidade de Boa Vista: Menos Vulneráveis; Zona 1 - englobando somente o bairro Cidade Satélite e Zona 3 - os bairros Aquilino da Mota Duarte, bairro Centro e seu transecto até o bairro Caçari, bairro Caçari e bairro Paraviana.; Mais vulneráveis: Zona 2 - todos os bairros localizados após o limite da BR 174, sentido leste, com exceção do Bairro Aquilino da Mota Duarte e os bairro entre a BR 174, Centro, Caçari e Paraviana. A média do Nível de água (NA) da cidade foi de 6,3m, os bairros com maior curva de nível se enquadraram nos bairros de menos vulnerabilidade; nos pontos Cecília Brasil, Cel Mota, Ig Mirandinha, Av Gen Sampaio registraram NA na superfície; o solo mais resistente foi o ponto Centro SEFAZ, no bairro Centro com limite de sondagem de 1,1m, o solo com menor resistência foi o ponto BR 174 localizado em área de cerrado após a ponte do Cauamé. Após a determinação das zonas menos e mais vulneráveis foi realizada uma análise de granulometria para representar cada zona, que classificou o material do ponto mais vulnerável como areia franca e franco arenoso e para o ponto representante da zona menos vulnerável apresentou a classificação do material como franco argilo arenoso e franco arenoso
Considering all the urban construction of Boa Vista, the following variables had been studied: altitude, water level and limit of probing, objectify the preliminary characterization of the subsoil of Boa Vista through probing of simple recognition. Had been used 75 point whose 47 were from the data base of the company A.P Engineering and RC engineering in the year of 1994 to the 2007 and more 28 data raise during the research. Was accomplished the analysis of multivary for the knowledge of standard not supervised according to the technique of Analysis of Hierarchic Component confirm by the Analysis of the Major result. With this 3 Zones for the City of Boa Vista had been identified: Less Vulnerable; Zone 1 - only englobando the Cidade Satelite districts and Zone 3 - the Aquilino da Mota Duarte districts, Centro districts and its transecto until the Caçari districts , Caçari districts and Paraviana districts; More vulnerable: Zone 2 - all the districts located after the limit of BR 174, felt east, with exception of the Aquiline districts of the Mota Duarte and the districts between BR 174, Center, Caçari and Paraviana. The average of the water Level (In) of the city was of 6,3m, the districts with bigger curve of level if they had fit in the districts of little vulnerability; in the points Cecília Brasil, Cel Mota, Ig Mirandinha, Av Gen Sampaio they had registered In the one in the surface; the ground most resistant was the point Center SEFAZ, in the Center districts with limit of sounding of 1,1m, the ground with lesser resistance was located point BR 174 in area of after closed the bridge of the Cauamé. After the determination of the zones and less vulnerable was carried through a granulometria analysis to represent each zone, that classified the material of the point more vulnerable as frank sand and frank arenaceous and for the representative point of the zone less vulnerable it presented the classification of the material as frank argilo arenaceous and frank arenaceous
Fletcher, William. "Potential Replacement of the US Navy's Rapid Penetration Test with the Method of Multichannel Analysis of Surface Waves". UNF Digital Commons, 2018. https://digitalcommons.unf.edu/etd/841.
Pełny tekst źródłaMasada, Teruhisa. "Structural performance of profile-wall plastic pipes under relatively shallow soil cover and subjected to large surface load". Ohio : Ohio University, 1996. http://www.ohiolink.edu/etd/view.cgi?ohiou1174611925.
Pełny tekst źródłaHassan, Zehtab Kaveh. "An Assessment Of The Dynamic Properties Of Adapazari Soils By Cyclic Direct Simple Shear Tests". Master's thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/12612228/index.pdf.
Pełny tekst źródłaOzkahriman, Fatma. "Cpt Based Compressibilty Assessment Of Soils". Master's thesis, METU, 2004. http://etd.lib.metu.edu.tr/upload/12605144/index.pdf.
Pełny tekst źródłaHosseini, Sadr Abadi Hamid. "Identificiation in-situ des sols liquéfiables par pénétromètre statique cyclique : modélisations physiques et numériques". Thesis, Université Grenoble Alpes (ComUE), 2019. http://www.theses.fr/2019GREAI078.
Pełny tekst źródłaThe identification of liquefiable soils and the behaviour of soils in response to cyclic stresses are important challenges in geotechnical engineering. Various laboratory and in-situ tests are used to evaluate this phenomenon. The Equaterre group, in particular, is developing a static penetrometer with a cyclic tip that allows a cyclic variation of the force to be imposed on the tip by means of sliding central rods and the resulting deformations to be measured. This provides direct access to the response of the soil in place, and potentially highlights a tendency towards liquefaction or cyclic mobility. This thesis has two main parts: physical modeling in a calibration chamber and numerical modeling.Physical modelling consists in carrying out feasibility tests of the method developed by Equaterre in a calibration chamber in the 3SR Grenoble laboratory. The tests in the calibration chamber were carried out on Fontainebleau sand, with two states of medium density and loose. CPTU tests and Equaterre cyclic penetrometer were performed in both situations. The results showed the good potential of this method to identify the risk of liquefaction.Numerical modelling is based on a coupling between the discrete element method (DEM) for the solid phase and a finite volume method defined at pore scale (PFV method) for internal flow. The geometry of revolution is used to reduce the modelled domain to a quarter of the problem, and a gradation of particle sizes according to the distance to the tip is also implemented to reduce the total number of particles (and therefore the computation times) while maintaining a fine discretization in the immediate vicinity of the tip. Two types of materials, dense and loose, are simulated and for each one the mechanical response is analyzed for the dry case and for the saturated case, under monotonous and cyclic loading. The analysis of the responses in terms of force and interstitial pressure shows a good qualitative agreement with the results in the calibration chamber.Keywords: Static cyclic penetrometer; Calibration chamber; Soil liquefaction; Discrete element method (DEM); Pore-scale finite volume method (PFV)
Talbot, Michael H. "Dynamic Cone Penetration Tests for Liquefaction Evaluation of Gravelly Soils". BYU ScholarsArchive, 2018. https://scholarsarchive.byu.edu/etd/7542.
Pełny tekst źródłaSangtian, Note. "Miniature piezocene tests and effects of smear due to vertical penetration in layered soils". Thesis, University of Sheffield, 2001. http://etheses.whiterose.ac.uk/10261/.
Pełny tekst źródłaŽaržojus, Gintaras. "Analysis of the results and it influence factors of dynamic probing test and interrelation with cone penetration test data in Lithuanian soils". Doctoral thesis, Lithuanian Academic Libraries Network (LABT), 2010. http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2010~D_20101230_093807-41798.
Pełny tekst źródłaDisertacijos objektas yra Lietuvos teritorijoje slūgsantys gruntai, kurie gali būti statinių pamatų pagrindu. Disertacijoje nagrinėjama grunto tyrimo dinaminiu (DPT) ir statiniu (CPT) zondavimu rezultatų interpretacija, tiesioginio (smūgių skaičiaus (Nx)) ir išvestinio (dinaminės kūgio smigos (qd)) DPT rodiklių patikimumas, analizuojami rezultatus įtakojantys veiksniai ir sąsajos tarp DPT bei CPT zondavimo rodiklių. Duomenų analizė atlikta matematiniais statistiniais metodais, taip pat panaudojant analitinius ir empirinius sprendinius. Išnagrinėjus skaičiavimo duomenis buvo nustatyta, kad netiesioginis dinaminio zonda-vimo rodiklis – dinaminė kūgio smiga (qd) dėl skaičiavimo trukumų yra nenaudotinas ir keisti-nas į tiesioginį rodiklį – smūgių skaičių (Nx). DPT rezultatus įtakojančių veiksnių analizė paro-dė, kad zondavimo duomenims didžiausią įtaką turi gruntų šoninis geostatinis slėgis ir kartu zondavimo štangų trintis į gruntą. Darbo metu buvo gauta, kad egzistuoja tamprus koreliacinis ryšys tarp smūgių skaičiaus (Nx) ir statinės kūgio spraudos (qc), kuris priklauso nuo grunto gra-nuliometrinės sudėties, mechaninių savybių ir slūgsojimo gylio.
Lobo, Bianca de Oliveira. "Mecanismos de penetração dinâmica em solos granulares". reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2009. http://hdl.handle.net/10183/24717.
Pełny tekst źródłaDynamic penetration tests are simple, economic and easily performed geotechnical investigation tools. Due to these general characteristics, the test has been used systematically in many countries such as Canada, United States, Japan and Brazil. Despite the attractive conditions of performing a simple test, dynamic penetration of a any tool into a soil mass produces a complex soil reaction mechanism that depends on the energy delivered to the soil, as well as the capability of the soil to absorb this energy. Given this complexity a simple approach of interpreting the test by using empirical correlations has prevailed. In 1970, Schmeertmmann & Palacius (1979) and Schmertmmann (1979) develop the first rational methodology to compute the energy delivered to the rod-sampler system that has been incorporated to engineering practice by normalizing different practices in terms of a reference energy. Most recent researches of SPT test interpretation make uses of energy concepts and work to compute the mobilized soil-resistance due to the sampler penetration (e.g. Oderebrecht, 2003; Odebrecht et al, 2005; Schnaid, 2005). In present research these recent approaches are extended through the use of energy concepts associated with dynamic equilibrium equations and cavity expansion theory (Vésic, 1972). Constitutive equations have been incorporated to a numerical simulation routine able to reproduce the some of the most important processes of soil reaction during dynamic in cohesionless soil. The model validation for different dynamic penetration test geometries (SPT, ILPT, NALPT and RLPT) enabled the energy delivered to soil to be evaluated and the effects of soil density, blow efficiency, hammer geometry, rod type and length to be assessed. From a number of simulations, it was possible to describe the differences related typical geometrical changes (i.e. hammer length, rod cross section and length). Conclusions from the analysis are that small geometrical changes in hammer and rod characteristics - typically observed in different SPT practices - produce differences into the measured blow count. As consequence, it is suggested that interpretation of dynamic penetration test results will depend on a model capable of incorporating all these effects when attempting to derive soil constitutive parameters. This is one of the outputs of the present study that lead to the development of two rational methodologies to assess the internal friction angle of cohesionless soils from dynamic penetration blow count. The first one uses the numerical simulation routine as a Inverse Boundary Value problem while the second one uses the Buckingham’s Theorem to develop an analytical equations that correlates the N-SPT with the soil shear strength. Both methodologies have been validated by a series of case studies designed to demonstrate that the proposed solution produces friction angle values of the same order of magnitude of other approaches and compatible to measurements produced by laboratory and in situ tests.
Pauly, Nicole M. "Thermal Conductivity of Soils from the Analysis of Boring Logs". Scholar Commons, 2010. http://scholarcommons.usf.edu/etd/3614.
Pełny tekst źródłaShamsabadi, Pegah Jarast. "Numerical and Physical Modeling of Cone Penetration in Unsaturated Soils and Numerical Simulation of Fracture Propagation in Shale Rock during Brazilian Test". Thesis, University of New Hampshire, 2018. http://pqdtopen.proquest.com/#viewpdf?dispub=10622976.
Pełny tekst źródłaPartially water saturated condition in soils may change the cone penetration resistance comparing with that of dry or saturated conditions. This effect was investigated in this study using numerical finite element modeling and experimental centrifuge testing. The results showed suction in unsaturated soil significantly influenced the soil resistance to cone penetration. Two approaches were implemented to numerically consider the partially saturated soil condition; i.e. modifying simple constitutive models using an apparent cohesion strategy and implementing Barcelona Basic Model for unsaturated soils. Both successfully captured the cone resistance profiles inside a calibration chamber and also in free field. In addition, details of developing a miniature cone setup capable of for cone penetration inside geotechnical centrifuge was explained. Further, the use of Linear Softening Cohesive Model (LCFM) to predict the fracture growth in shale rocks during Brazilian Test was examined. The application and importance of considering two different compressive and tensile elastic modulus and soil anisotropy during the fracture modeling of shales were demonstrated.
Lau, Chi Keung. "Scale effects in tests on footings". Thesis, University of Cambridge, 1988. https://www.repository.cam.ac.uk/handle/1810/245006.
Pełny tekst źródłaQuintero, Natalia M. "Validation of the Enhanced Integrated Climatic Model (EICM) for the Ohio SHRP Test Road at U.S. 23". Ohio University / OhioLINK, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1195142855.
Pełny tekst źródłaColet, Marcelo Jose. "Alteração de atributos fisicos de um solo, sob pastagem degradada, submetido a escarificação". [s.n.], 2006. http://repositorio.unicamp.br/jspui/handle/REPOSIP/257167.
Pełny tekst źródłaDissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Agricola
Made available in DSpace on 2018-08-06T11:40:15Z (GMT). No. of bitstreams: 1 Colet_MarceloJose_M.pdf: 1345316 bytes, checksum: eab5245a765385f0518aa0e4b50988db (MD5) Previous issue date: 2006
Resumo: O uso intensivo do solo, associado ao emprego de práticas de manejo inadequadas, implica em sua degradação. Este problema é de comum ocorrência em áreas de pastagens, onde usualmente o produtor prioriza investimentos no rebanho, negligenciando o manejo do solo. Nessas áreas, a compactação do solo pode ser considerada uma das principais causas de limitação da capacidade de produção da forrageira. Várias técnicas podem ser utilizadas para romper camadas compactadas do solo, dentre elas a escarificação. Sendo assim, o objetivo deste trabalho foi avaliar as alterações ocorridas em atributos físicos de um solo sob pastagem mediante sua escarificação, visualizando a recuperação de pastagens degradadas. Para tal, implementou-se um experimento em uma área de Brachiaria decumbens no Instituto de Zootecnia em Nova Odessa (SP), utilizando um protótipo de máquina agrícola desenvolvido na Feagri/Unicamp, que permite a escarificação do solo e distribuição de corretivos simultaneamente. O efeito da escarificação do solo foi avaliado pela resistência do solo à penetração, determinada com um penetrógrafo hidráulico eletrônico, e pelos atributos físicos macroporosidade, microporosidade, porosidade total e densidade do solo, em avaliação aos 60 dias após instalação do experimento. A escarificação do solo propiciou o aumento da macroporosidade e da porosidade total e, redução da densidade do solo nos 100 milímetros superficiais, quando observados na entrelinha da passagem do escarificador, porém, não afetou as propriedades macroporosidade, microporosidade e densidade do solo na profundidade de 100-200 milímetros. Para a condição deste experimento, a escarificação do solo provocou uma leve compactação logo abaixo da profundidade de trabalho, evidenciada pela redução na macroporosidade. A metodologia de análise da área sob a curva possibilitou comparar estatisticamente a resistência do solo à penetração. A escarificação do solo reduziu os valores de resistência do solo à penetração, evidenciada de forma estatisticamente significativa quando comparados pela metodologia de análise da área sob a curva de resistência
Abstract: The intensive use of the soil combined with inadequate management practices leads to soil degradation. This problem is common with pasturelands, where the farm manager specializes in animal husbandry, and not in soil management. Soil compaction in such areas can be considered as one of the main limitations to forage production capability. Several techniques may be applied to break through compacted soil layers, and scarification is one of them. The objective of this study is to evaluate the changes to soil physical properties in pasture areas after scarification, aiming at the recovery of degraded pasturelands. The experiment was set up at the Zootechny Institute in Nova Odessa (SP) on a Brachiaria decumbens field. The machine used in the study was a prototype developed at Feagri/Unicamp for simultaneous soil scarification and fertilizer distribution. The effect of scarification on the soil was evaluated by soil resistance to penetration with an electronic hydraulic penetrographer, and by the physical attributes of macroporosity, microporosity, total porosity and soil density 60 days after setup. Scarification increased soil macro and total porosity, and reduced soil density on the top 100 mm, observed between scarification rows. Macroporosity, microporosity and soil density was not affected in the depth of 100-200 mm. Scarification caused a slight compaction immediately below the work-depth, made evident by the higher macroporosity in this section of the soil. The methodology of analyzing the area below the resistance curve allowed the statistical comparison of soil resistance to penetration. This methodology showed that scarification caused statistically significant reduction of the figures on soil resistance to penetration
Mestrado
Agua e Solo
Mestre em Engenharia Agrícola