Numerical analysis of pile responses to shield tunneling in Bangkok's subsoil | |
| Author | Medagoda, Chandana J. |
| Call Number | AIT Thesis no.GE-08-08 |
| Subject(s) | Shields (Geology)--Thailand--Bangkok Tunneling--Thailand--Bangkok |
| Note | A thesis submitted in partial fulfillment of the requirements for the Degree of Master of Engineering in Geotechnical and Geoenv ironmental Engineering, School of Engineering and Technology |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. GE-08-08 |
| Abstract | Soft ground tunneling induced single and group pile responses are evaluated by PLAXIS 2D and PLAXIS 3D TUNNEL finite element programs in Bangkok subsurface condition. Linear-perfectly plastic Mohr-Coulomb constitutive law is adapted to model the soil behavior. Undrained effective stress analyses with effective strength parameters are performed to evaluate single and group pile responses. Tunneling induced single pile responses are analyzed by varying the pile distance from the tunnel vertical axis, tunnel depth relative to the pile tip, pile dimension, pile axial load and pile length. Pile dimension shows predominant influences to tunneling induced soil movements while the pile axial load has comparatively less effect. Moreover, the tunneling induced responses of single pile depend on pile distance from the tunnel vertical axis and pile tip level relative to the tunnel horizontal axis. The 3D group piles analyses reveals that the significant reduction in pile responses in terms of shear force and bending moment in rear piles compared to the case of single pile. The 2D and 3D analyses were performed on selected four sections of MW A water transmission tunnel (Contract G-MC-7C) in Bangkok. Pile responses by 3D analyses are higher compared to the predictions by 2D analyses. The 3D analysis was carried out on shop house adjacent to the tunnel alignment in Downtown Extension (DTE) project in Singapore to evaluate the mixed foundation effects to tunneling induced soil movements. It is highlighted that tunneling underneath the pile foundation is critical since the tensile stress development in the piles |
| Year | 2009 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. GE-08-08 |
| 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) | Noppadol Phien-wej; |
| Examination Committee(s) | Bergado, Dennes T.;Park, Kyung-Ho;Davies, John; |
| Scholarship Donor(s) | Thailand (HM King); |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 2009 |