Stress-strain behavior of soft Bangkok clay below the state boundary surface under anisotropic conditions | |
| Author | Khan, Mohammod Ruhul Amin |
| Call Number | AIT Thesis no.GE-98-28 |
| Subject(s) | Strains and stresses Clay--Thailand--Bangkok--Testing |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Engineering and Technology |
| Publisher | Asian Institute of Technology |
| Abstract | The Stress-strain behavior of soft Bangkok clay within the State Boundary Surface has been studied by carrying out eighteen anisotropically overconsolidated drained (16) and undrained (2) and two isotropically normally consolidated undrained tests in compression and extension mode. All OC specimens sheared with different applied stress paths at the same OCR of 2. Pre-shear void ratio was 1.98 to 2.10 with average water content of 92%. A. and K values were 0.528 and 0.121 respectively. The consistency and trend of all (q, Es), (p, Ev), (n,Es), (Ev, Es) curves added credibility to the accuracy of the test data. Based upon the total and plastic strains, shear strain contours within the wet side o.f critical state point are nearly parallel to each other while at the dry side they converge to a point. The total and plastic volumetric strain contours within the SBS has been divided into two and three zones respectively. In total volumetric strain contours, strain in zone-I is compressive and in zone-II is dilatational. In plastic volumetric strain contours, strain in zone-I is zero, i.e., purely elastic, in zone-II compressive and in zone-III is dilatational. Shapes of both volumetric strain contours are similar to the undrained stress path of different OCR. Contours of ~8~ + 8: and ~8:2 + 8:2 are elliptical in shape. Total and plastic strain contours corresponding to the stress circles and stress contours corresponding to the total and plastic strain circles, both categories of contours are also elliptical in shape. The reasonable prediction by PENDER model is also compared with the test results. Analysis and the experimental results from this investigation will provide useful contribution to the formulation of theories and models dealing with critical state soil mechanics and associated and non-associated flow rule as generally conceived in the elasto-plastic behavior of soil. |
| Year | 1999 |
| Type | Thesis |
| School | School of Engineering and Technology (SET) |
| Department | Department of Civil and Infrastucture Engineering (DCIE) |
| Academic Program/FoS | Geotechnical Engineering (GE) |
| Chairperson(s) | Balasubramaniam, A. S. |
| Examination Committee(s) | Seah, Tian Ho;Der Guey, Lin;Otsu, Hiroyasu |
| Scholarship Donor(s) | His Majesty the King |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1999 |