| Author | Trani, Laricar Dominic O. |
| Call Number | AIT Thesis no.GE-05-13 |
| Subject(s) | Clay--Thailand--Bangkok
|
| Note | A thesis submitted in pa1iial fulfillment of the requirements for the degree of Master of Engineering, School of Engineering and Technology |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. GE-05-13 |
| Abstract | A series of laboratory tests on normally consolidated soft Bangkok clay specimen had been directed to study the influence of elevated and cyclic thermal loading on its thermo-mechanical behavior. The amount of irreversible thermal contraction of normally consolidated soft Bangkok clay amounts to 4.25 and 6.5% after cyclic thermal loading at a maximum temperatures of 70 and 90 °C, respectively. Undrained shear strength is dependent on temperature as it increases as the temperature increases or after subjecting to cyclic thermal loading. The corresponding excess pore water pressure mobilization is temperature-dependent as well. In drained shearing conditions, deviatoric stresses sustain higher peak values when subjected to higher thermal loading but exhibit thermal independence at large strains. The calculated stress-strain secant modulus is temperaturedependent since it increases as the temperature increases. The critical state line is temperature-independent in q. -p plane. The stress paths of the heated NC specimens sheared at same stress level tend to move to the right of the unheated specimen as the temperature increases leading to change in the geometry of the Roscoe surface. In undrained heating, the amount of thermally induced pore water pressure is dependent -on the stress history and current stress level. The pore pressure build up dissipated during the cooling phase and exhibits full reversibility. The compression line of the consolidation curve of soft Bangkok clay shifts to the left with approximately similar slope (A.). The slope of the swelling line (K) is temperatureindependent as long as the application of heat is in the normally consolidated (NC) state. The movement of the compression line denotes reduction in the elastic zone size. The observed increase in the undrained shear strength of NC clays is due, in part, to the volume contraction induced by thermal load and possibly from the microstructural changes in the soil fabric. The experimental results show that the strength induced by volumetric changes alone only comprises 60% of the total developed thermally induced shear strength increase. It is believed that the remaining 40% comes from the restructuring of the soil fabric activated due to thermal exposure up to 90 °C. The proposed thermo-elasto-plastic model that predicts the shear strength behavior at elevated temperature is valid only in states wetter than critical condition. There is a reasonable agreement between the proposed model and the test results. |
| Year | 2005 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. GE-05-13 |
| Type | Thesis |
| School | School of Engineering and Technology (SET) |
| Department | Other Field of Studies (No Department) |
| Academic Program/FoS | Geotechnical Engineering (GE) |
| Chairperson(s) | Bergado, Dennes T.; |
| Examination Committee(s) | Glawe, Ulrich;
Pham Huy Giao; |
| Scholarship Donor(s) | His Majesty the King of Thailand |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 2005 |