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| 008 | 191197s1990 th uzm rtt 00| a1eng d | ||
| 035 | _a.b10245613 | ||
| 099 | 9 | _aAIT Diss. no. GT-89-02 | |
| 100 | 1 |
_aBuensuceso, Benjamin Ramos, _cJr. |
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| 245 | 1 | 0 | _aEngineering behavior of lime treated soft Bangkok clay |
| 260 |
_aBangkok : _bAsian Institute of Technology, _c1990 |
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| 300 | _a208 p. | ||
| 490 | 1 |
_aDissertation ; _vno. GT-89-02 |
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| 500 | _aA dissertation submitted in partial fulfillment of the requirements for the degree of Doctor of Engineering, School of Engineering and Technology | ||
| 502 | _aThesis (Ph.D.) - Asian Institute of Technology, 1990 | ||
| 520 | _aThe strength and deformation characteristics of lime treated soft cl ay were studied through a comprehensive series of unconfined, oedometer and triaxial tests, in which the effects of lime content and curing time were considered. The base cl ay used were samples of lightly over consolidated soft Bangkok clay, with an organic content of 4.3%. Quicklime powder was used to stabilize the soft clay, and lime contents were varied from 2.5 to 15%. For the unconfined compression and oedometer tests, the soil properties were monitored for a period of 6 months , while the triaxial tests were conducted at one and two months curing time. The range of pre-shear consolidation pressures employed in the triaxial compression tests were from 5 to 60 t/m2 {u2022} The unconfined compressive strength of lime treated clays was found to increase with curing time, and that a lime content of 10% can be regarded as an optimum lime content to result in the highest relative strength gain. Results of the oedometer tests revealed that lime treatment also resulted in improved consolidation properties, considering the apparent increase in vm, the lower Cc and the higher cv after lime treatment. Based on the triaxial stress-strain characteristics, stress paths, pore pressure development and volume change characteristics , it was established that the main effect of lime treatment was to change the strength and deformation characteristics of the soft clay from normally consolidated to over consolidated cl ay behavior. The degree of over consolidation was influenced by the lime content, curing time, jo, and the applied stress path. Heavily over consolidated (rigid) behavior was observed for stress states inside the volumetric yield locus obtained from the anisotropic consolidation tests. The volumetric yield loci of lime treated clays are similar in shape and orientation to the limit state curves for natural clays, presented by MITCHELL (1970). Outside the volumetric yield locus, the behavior was found to consist of an initial pseudo-elastic phase (wherein the pore pressure development and volume changes were small), followed by a stage wherein the behavior appears to be similar to that of a work-hardening material as the stress paths proceed towards curved failure envelopes. The treated clays strained-softened after failure , with the residual stress states lying close to the critical state line of the untreated clay. The strength and water content relationships were analyzed in terms of the Critical State concept, and it was found that t he initial, peak and residual states of treated clays have curved projections on the (q, ~) and water content- effective stress plots. A conceptual mod el to describe the mechanical behavior of lime treated clay was introduced , in which t he presence of a distortional yield locus which shifts with t he lime content and curing period was considered. The conceptual model was t hen used in conjunction with the Revised Theory of ROSCOE & BURLAND (1968) , specifically to analyze t he work- hardening behavior of lime treated clays. The strains predicted using the Revised Theory were found to be in general agreement with the experimentally observed strains. | ||
| 650 | 0 |
_aClay _xThailand _xBangkok |
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| 700 | 1 |
_aBalasubramaniam, A.S., _eChairperson |
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| 700 | 0 |
_aNoppadol Phien-Wej, _eCo-Chairperson |
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| 700 | 1 |
_aHonjo, Yusuke, _eExamination Committee |
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| 700 | 0 |
_aPichai Nimityongskul, _eExamination Committee |
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| 710 | 2 |
_aThe Government of Japan, _eScholarship Donor |
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| 810 | 2 |
_aAsian Institute of Technology. _tDissertation ; _vno. GT-89-02 |
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| 856 |
_3Full-Text _uhttp://203.159.5.9/ait-thesis/detail.php?q=B18152 |
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