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Evaluation and calibration of soil tests for available zincAlley, Marcus M. 11 May 2010 (has links)
The results of the research show that either the EDTA-(NH4)C03 procedure or the multivariate regression equation could be used to estimate the Zn supplying powers of Virginia soils. It was pointed out that the critical levels obtained for the procedures are considered tentative and that the calibration should be continued as more field data become available. / Master of Science
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The design and construction of a large plane strain apparatus for testing reinforced soil specimensDove, Joseph E. January 1986 (has links)
The increased popularity of using reinforcement in embankment fills and slopes has created a need for studies of the interaction between the reinforcement and surrounding soil to provide an improved basis for limit equilibrium design methods. The purpose of this study was to develop a plane strain triaxial apparatus and associated equipment to study the interaction of soil and reinforcement.
The plane strain apparatus was designed to model an element of soil situated along a slip surface in a reinforced embankment. The device constructed is capable of testing a sample 9.4 inches square and 23 inches high with full-size reinforcing materials included. A 30,000-pound capacity load frame and a 20,000-pound capacity electric load cell were also constructed during this study. Drawings of the equipment constructed and a design method for the load cell are included.
Preliminary tests on unreinforced and reinforced samples under a confining pressure of 10 psi were performed to check the equipment operation. These tests show that the equipment functions as planned. Modifications desirable to improve the performance of the equipment are given. / M.S.
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Applications of cone, vane and vane-cone to predict stress-strain behaviour of unsaturated cohesive soilLiao, Chung-Lon January 1986 (has links)
No description available.
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Applications of cone, vane and vane-cone to predict stress-strain behaviour of unsaturated cohesive soilLiao, Chung-Lon January 1986 (has links)
No description available.
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Analysis of the pressuremeter test by FEM formulation of the elasto-plastic consolidationJain, S. K. January 1985 (has links)
A decade has passed since the development of the self-boring pressuremeter (SBPM). Even though the device has been recognized by the geotechnical engineering profession as having high promise for evaluating in-situ stress-strain behavior of soils, its use is limited. In large part, this is due to the fact that there are important unanswered questions about the SBPM test. One of the major issues concerns the influence of drainage in the soil as it is sheared. In clays, the test is assumed to be undrained, but there is no way to control this other than by the rate of loading and no method has been put forth heretofore to define the required rate.
This dissertation addresses the drainage issue by applying a numerical model capable of simulating the pressuremeter test under variety of conditions. To develop parameters for the soil model, a comprehensive laboratory testing effort was needed. The validity of the numerical model and the soil parameters is established by comparing it to SBPM tests performed in the field.
The numerical model uses the finite element method in a special code capable of handling large strains, consolidation effects, and nonlinear soil behavior. Particular attention is addressed to the issue of pore pressure development and its dissipation. Relative influences of important soil parameters such as the permeability are checked against various rates of loading in the SBPM test. The results demonstrate that drainage likely occurs in most cases using conventional test procedures, and that this, in turn, leads to an error in interpretation of SBPM data. Based on the findings in the analyses, a procedure is proposed which should lead to a more rational method of performing the SBPM test where nearly undrained conditions are desired. / Ph. D.
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The influence of joint-planes on the strength of undisturbed residual soilAu, Wai-cheung, Stanley., 歐偉長. January 1974 (has links)
published_or_final_version / Civil Engineering / Master / Master of Philosophy
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Experimental study of shear behavior of soils with abundant coarse particles associated with slip zones of large landslides in the ThreeGorges reservoir, ChinaLi, Yanrong, 李彥榮 January 2009 (has links)
published_or_final_version / Earth Sciences / Doctoral / Doctor of Philosophy
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Failure of saturated sandy soils due to increase in pore water pressureJunaideen, Sainulabdeen Mohamed. January 2005 (has links)
published_or_final_version / abstract / toc / Civil Engineering / Doctoral / Doctor of Philosophy
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Soil property determination through a knowledge-based system with emphasis on undrained shear strength馮可達, Fung, Ho-tat. January 1997 (has links)
published_or_final_version / Civil and Structural Engineering / Doctoral / Doctor of Philosophy
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Development of sounding equipment for the assessment of the time- settlement characteristics of recent alluvial deposits when subjected to embankment loads.Jones, Geraint Alan. January 1992 (has links)
The whole of this thesis is my work unless specifically indicated to the contrary in the text,
and has not been submitted in part or in whole to any other University.
Some thirty years ago the author operated a deep sounding machine, one of the first in
the country, on a misty lake in Ireland and marvelled at the way subsoil information could
be garnered. The magic of the moment never entirely passed and when the opportunity
arose to use the technique in Natal the die was cast.
The development of the national road system surged in the early 1970's and since many
of these roads on the Natal coastal routes crossed extensive recent alluvial deposits, the
geotechnical problems of instability and settlement became major factors in the road
design. Traditional methods of investigation consisted of boreholes with sampling and
laboratory testing. Whilst these were satisfactory, provided they were of adequate quality,
they were relatively expensive if sufficiently detailed models of the subsoil were to be
obtained for design purposes.
Cone penetration testing provided a potential a solution and this led to research work
conducted over a period of twenty five years which continues today. The initial
development of ideas for improvements to the mechanical equipment took place whilst the
author was carrying out preliminary investigations for freeway routes over the coastal
alluvial deposits. This was followed by a period devoted largely to cone penetration testing
research and deVelopment and to embankment design methods at the National Institute
for Transport and Road Research, and to the initial registration for a Master's degree
under the supervision of Professor K Knight in 1975. This research programme was
completed as originally envisaged, but not submitted because during its course the author
conceived the idea of the piezometer cone. This proved to be such an exciting prospect
that the research and development continued for a number of years until piezometer cone
testing has now become almost routine for geotechnical investigations on alluvial deposits.
In 1983, due to Professor Knight's retirement from the University, Mr Phillip Everitt was
appointed as the supervisor.
At that stage piezometer testing was becoming accepted internationally and new aspects
and information frequently appeared. It was apparent, however, that the essential proof
of the system for the prediction of embankment performance was to use it at
embankments where the performance had been monitored. Eventually grants were
provided by the Department of Transport for this, which enabled two research projects to
be conducted during 1989 - 1990 and 1991 - 1992. After completion of the first of these
a presentation of the author's work on cone penetration testing since the mid 1960's was
made to the Faculty of Engineering at the University of Natal. The Executive Committee
of the University Senate subsequently approved, in August 1991, that the registration be
upgraded to doctoral status.
Mr Everitt's encouragement during this extended period has been a vital factor in ensuring
an outcome for this task and the author wishes to express his gratitude for this. / Thesis (Ph.D.)-University of Natal, Durban, 1992.
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