| Author | Uba Sirikaew |
| Call Number | AIT Thesis no. GT-93-25 |
| Subject(s) | Rock mechanics
Lam Ta Khong Project
|
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Science, School of Civil Engineering |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. GT-93-25 |
| Abstract | Strength and defonnability of siltstone and sandstone of the Lam Ta Khong Pumped Storage
Project were evaluated from the results of laboratory and field in situ tests. Preserved rock core
samples were collected from a drilled hole for determining the strength, static and dynamic elastic
modulus and the triaxial property. The rest of the data were mainly obtained from the previous
and concurrent testing made by IlCA and EGAT. In situ modulus of defonnation was measured
by using the flexible dilatometer and plate load tests and was compared to the laboratory value.
Hydraulic fracturing tests were carried out in drilled holes to determine the in situ stress and
tensile strength of rock mass. The trend of a decrease in the point load strength index with
increasing in water content of intact siltstone was recognized in this study. The influence factors
caused the variation of the defonnation modulus of rock were discontinuity conditions at the test
areas which could be quantified by RQD or RMR According to the typical pressure-defonnation
curve obtained from plate load test siltstone could be classified as strong but cracked rock. The in
situ stress of the study area showed the ratio of the major principal horizontal stress to the vertical
stress as approximately 1. 7. The orientation of the major principal horizontal stress was parallel to
the mountain crut: N 5° E-S 5°W, with about 14 MPa in the magnitude. Lugeon values and the
records of water loss during drilling, clearly showed that sandstone bedding was more pe1meable
than siltstone due to their nature of joint openness. |
| Year | 1993 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. GT-93-25 |
| Type | Thesis |
| School | School of Civil Engineering |
| Department | Department of Civil and Infrastucture Engineering (DCIE) |
| Academic Program/FoS | Geotechnical and Transportation Engineering (GT) |
| Chairperson(s) | Noppadol Phienwej; |
| Examination Committee(s) | Prinya Nutalaya;Orsmael, J.L. Van; |
| Scholarship Donor(s) | The Government of the Republic of Korea; |
| Degree | Thesis (M.Sc.) - Asian Institute of Technology |
