| Author | Guan, Khaw Lai |
| Call Number | AIT Thesis no.GT-85-34 |
| Subject(s) | Subsidences (Earth movements)--Asian Institute of Technology
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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 |
| Abstract | Ground failure related to depletion of ground water and the resultant subsidence associated deformations occur in AIT at many locations and at various degrees. The magnitude of subsidence in relating to soil properties and soil stratification were investigated. Eight exploratory boreholes were drilled and continuous undisturbed samples recovered were tested to furnish data needed in predicting the soil compressibility parameters. Field monitoring and known records of subsidence, including the most recent precision levelling in AIT Campus last July, 1985 were compiled to determine the rate and pattern of subsidence. A program based on one-dimensional consolidation theory using finite difference implicit scheme was developed to predict the settlement due to drawdown in the soft clay layer. Variation of thickness and soil properties in space and time as consolidation proceeds is fully accounted for in the program. The experimental investigation shows that the different pattern of drawdown at different locations as well as the presence of permeable macrofabric system in the clay and the thick compressible layer with higher compressibility were responsible for the unequal magnitude of subsidence registered at different points in AIT Campus . The subsidence rate during dry season for a period of four months was found to be high of 8 . 39 cm per year whilst the average rate for a period of 15 months which includes the slow subsidence rate in the rainy season was found to be much lower of 2 . 35 cm per year. The calculated subsidence rate based on field measurements at Football Field, NZ -Housing and Tennis Court near AIT Center were found to be 3.39, 1.9 and 3.96 cm per year respectively while the predicted rates for the above mentioned locations were estimated to be 2.6, 1.9 and 3.9 accordingly. The predicted subsidences were found to have closed agreement with actual field measurements. |
| Year | 1986 |
| Type | Thesis |
| School | School of Engineering and Technology (SET) |
| Department | Other Field of Studies (No Department) |
| Academic Program/FoS | Geotechnical and Transportation Engineering (GT) |
| Chairperson(s) | Bergado, Dennes T. |
| Examination Committee(s) | Balasubramaniam, A.S. ;Prinya Nutalaya ;Chandra, Sarvesh |
| Scholarship Donor(s) | Royal Danish Government (DANIDA) |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1986 |