| Author | Ali, Justin |
| Call Number | AIT Thesis no.GE-96-06 |
| Subject(s) | Shear strength of soils--Testing
|
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Civil Engineering |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. GE-96-06 |
| Abstract | A series of constant volume direct shear tests was performed on soil samples collected from Nong Ngoo Hao and AIT site in the soft clay layer as to investigate the undrained shear strength parameter and to investigate the aging and structure effects on the undrained shear strength. Three types of the clay samples have been prepared in order to examine the above-mentioned effects on the undrained shear strength. These reconsolidation procedures are, reconsolidated the samples intact samples with the vertical stress being equal to the in-situ effective stress, reconsolidated far beyond in-situ effective stress and reconsolidated the reconstituted specimen to its normally consolidated state prior to shear. It was found that the ds and cu for undisturbed Nong Ngoo Hao clay was about 29.5 ° and 20.5 ° and for undisturbed AIT clay was about 31.5 ° and 24.8 ° respectively. For both Nong Ngoo Hao and AIT site, the undisturbed clay showed the brittle behaviour as observed in the peak shear stress in normalized shear stress versus diplacement relationship. This relationship also showed that peak shear stress in the field as twice as the peak shear stress observed in the normally consolidated state. Both for undisturbed samples and reconstituted samples exhibit the same shear stress-displacement and shear stress-normal stress relationship. TI1e aging effects caused by chemical bonding contributed almost the same magnitude both in Nong Ngoo Hao and AIT to the shear strength, but secondary compression took more portion in AIT clay compared to Nong Ngoo Hao. The k value which indicated the degree of secondary compression in Nong Ngoo Hao was found about 1.17, while in AIT was found about 1.88. Comparison and correlation of the undrained shear strengtl1 obtained from field vane and direct shear box gave close results as indicated by Suftv) I Suftd) in the range of 0.84 to 0.90 in Nong Ngoo Hao and AIT respectively. |
| Year | 1997 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. GE-96-06 |
| Type | Thesis |
| School | School of Civil Engineering |
| Department | Department of Civil and Infrastucture Engineering (DCIE) |
| Academic Program/FoS | Geotechnical Engineering (GE) |
| Chairperson(s) | Shibuya, Satoru; |
| Examination Committee(s) | Balasubramaniam, A.S. ;Bergado, Dennes T.; |
| Scholarship Donor(s) | Slmnet Riyadi Foundation Yogyakarta, Indonesia; |
| Degree | Thesis (M. Eng.) - Asian Institute of Technology |