| Author | Alea, Roque C., Jr. |
| Call Number | AIT Thesis no.GE-06-03 |
| Subject(s) | Clay--Thailand--Bangkok
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| 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 |
| Series Statement | Thesis ; no. GE-06-03 |
| Abstract | This study verified the innovative technique thermo-PVD to improved soft Bangkok clay or enhanced the PVD efficiency associated with the reduction of smear effect. A series of laboratory test were conducted utilizing large and small consolidometer with undisturbed and reconstituted specimen. In addition, two full scale embankment were built to distinguished the performance on the actual field of application Analysis were carried out to compare the compressibility parameter and consolidation behavior. Microstructure of laboratory specimens have been evaluated also using the Scanning Electron Microscope (SEM) after the consolidation test. It has been found that higher magnitude of settlement of thermo-PVD improved soft Bangkok clay than those ordinary PVD. When the specimens are heated, faster rates of consolidation and higher magnitude of settlements were achieved. Moreover, reduction of water content occurred with the increased in temperature. High reduction of water content was achieved around heat source, within 2.5 times the radius of heat source, while at farther distances the water content reduces slightly. On the other hand, shear strength increase with increasing temperature and decreasing water content. Then, high increase in shear strengths were achieved within the same limited zone at distance 2 times the radius of heater away from heat source. The Ch and Kh/Ks values for undisturbed specimens without heat were 3.13 m2/yr and 5.21, respectively. Upon subjecting to heat the corresponding values were 3.66m2/yr and 4.0. The Ch and Kh/Ks values for reconstituted specimens without heat ranges from 2.19-2.25 m2/yr and 1.75, respectively. Upon subjecting to heat the corresponding values were 2.62 -2.74 m2/yr and 1.45. Scanning electron microscope (SEM) evaluation of soil sample improved with thermo-PVD demonstrated a random particle arrangement than the ordinary improvement. Higher shear strength generated had been attributed to more contacts between clay particles which was due to the collapse of smectite clay minerals subjected to the load and temperature change. Numerical analysis of large scale laboratory model was carried out and their is good agreement between experimental results using the drain element to model PVD. The full scale analysis based from the back-calculated results showed that the Kh/Ks are 10 and 5.75 from nonheated and heated respectively. The Ch values is about 6.62 m2/yr. and 12.27 m2/yr. from the PVD and thermo-PVD respectively. Time is shorter to reach 90% degree of consolidation of thermo-PVD than PVD and is about one half, Therefore thermo-PVD can be one of the most economical and viable method in ground improvement of soft clay technology |
| Year | 2006 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. GE-06-03 |
| 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) | Bergado, Dennes T.; |
| Examination Committee(s) | Noppadol Phien-wej;Giao, Pham Huy; |
| Scholarship Donor(s) | His Majesty the King of Thailand; |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 2006 |