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035 _a.b10229851
099 9 _aAIT Thesis no. 760
100 1 _aChaudhry, A. Rauf
245 1 0 _aEffects of applied stress path on the stress-strain behaviour and strength characteristics of soft Nong Ngoo Hao clay
260 _aBangkok :
_bAsian Institute of Technology,
_c1975
300 _a199 p.
490 1 _aThesis ;
_vno. 760
500 _aA thesis submitted in partial fulfillment of the requirements for degree of Master of Engineering at the Asian Institute of Technology, Bangkok, Thailand.
502 _aThesis (M.Eng.) - Asian Institute of Technology,1975
520 _aThis thesis presents the experimental investigation on the stress-strain behaviour and strength characteristics of normally consolidated saturated specimens of Soft Bangkok Clay. The specimens were taken from the Nong Ngoo Hao Clay deposit (at depths of 5.5-6.0 m) and were tested under different applied stress paths in the conventional axi-symmetric triaxial apparatus. The different types of tests carried out are (i) Consolidated undrained tests (CIU) (ii) Consolidated drained tests (CID) (iii) Constant mean normal stress tests (CIP*) (iv) Anisotropic consolidation tests (c~) All tests were carried out under controlled stress conditions. The experimental observations from each series of tests are presented in the normalized stress-strain plots. Unique relationships are observed between the normalized stresses and strains. Also for each types of tests unique relationships are obtained between the stress ratios (q*/p* and o1/03) and the strains. The end points of all the specimens sheared under constant p* conditions and fully drained (with constant cell pressure) conditions lie on the same straight lines in the (q, p) and (q*, p*) plots. The value of critical state t parameter M is about 0.925 and the values of strength parameters are c = O, = 23.7°. The corresponding values for undrained tests are M = 1.05, c = O, and 6 = 27°. The experimental observations obtained in the author's testing program are also compared with the results of other research workers, who have carried out extension tests on the same clay. The strength parameters for undrained tests under extension conditions are c = 0 and i = 37°. The corresponding values for drained tests under extension conditions being 26.2°. Unique water content strength relationship exists for all types of tests when plotted in the (wf, log q*) plot. Also, the projection of the critical state line was unique and parallel to the isotropic consolidation line in the (wf, log p*f) space, During anisotropic consolidation, the strain increment ratio was a constant and the void ratio varied linearly with the logarithm of the mean normal stress (the slope of the line is the same, A = 0.51 as that for isotropic consolidation. Unique state boundary surface was obtained for all types of tests when plotted in the (q*/p*e, p*/p*e) space. Strains were predicted using the concept of unique state boundary surface and were compared with the experimental observations. The incremental stress-strain theory and the Revised Theory successfully predicted the strains for constant p* and fully drained (constant cell pressure) tests.
650 0 _aClay
_xThailand
_xNong Ngoo Hao
_xAnalysis
700 1 _aBalasubramaniam, A.S.,
_eChairperson
700 1 _aMoh, Za-Chieh,
_eExamination Committee
700 1 _aBrenner, R.P.,
_eExamination Committee
710 2 _aBritish Government,
_eScholarship Donor
810 2 _aAsian Institute of Technology.
_tThesis ;
_vno. 760
856 _3Full-Text
_uhttp://203.159.5.9/ait-thesis/detail.php?q=B24019
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