Laboratory investigation of stiffened deep cement mixed (SDCM) pile | |
| Author | Bhandari, Anil |
| Call Number | AIT Thesis no.GE-05-01 |
| Subject(s) | Concrete piling Soil cement--Testing |
| 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-05-01 |
| Abstract | The low tensile strength and stiffuess of Deep Cement Mixed (DCM) pile causes unexpected failure that has been mitigated with the introduction of stiffened deep cement mixed (SDCM) pile. The SDCM is a new type of DCM pile reinforced by concrete core pile. In this research, the interface behavior of SDCM pile and its strength has been studied by various tests in the laboratory. Based upon the findings of the previous researches, the cement content on the clay cement was varied from 10% to 20% by dry weight of clay while it was remolded at its liquid limit for optimum strength. The friction between the concrete core pile and soil cement has been studied by direct shear test and interface shear test. The 15% cement content can be regarded as optimum cement content for interface strength. The ratio of diameter of concrete core pile to DCM affected the interface strength measured in laboratory. The CU triaxial test of model SDCM pile revealed that the concrete core pile length should be more than 75% of the DCM pile length to have significant improvement. The concrete core pile extending 90% of the DCM length yielded significant improvement on the strength of SDCM. The study also revealed that the failure was in DCM pile with shorter core pile length (60% and 75%). In contrast, the longer core pile length (90%) with relatively smaller cross-sectional areas shifted the failure to the core pile. The laboratory modeling of SDCM pile verified the possibility of further reduction on settlement than DCM only. The settlement reduction was linearly proportional to the increase in length of the concrete core pile. The numerical study of the influence of pile cap rigidity on settlement behavior of SDCM pile suggests that the pile cap must be rigid enough to achieve equal strain conditions in order to obtain further improvements with SDCM pile. |
| Year | 2005 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. GE-05-01 |
| 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, D.T. |
| Examination Committee(s) | Noppadol Phien-wej; Glawe, Ulrich |
| Scholarship Donor(s) | His Majesty the King of Thailand |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 2005 |