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Pile Response Adjacent to Braced Excavation |
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| Authors: | A. T. C. Goh K. S. Wong C. I. Teh D. Wen |
| Affiliation: | 1Associate Professor, Geotechnical Research Center, School of Civil and Environmental Engineering, Nanyang Technological Univ., Nanyang Ave., Singapore 639798. 2Associate Professor and Director, Geotechnical Research Center, School of Civil and Environmental Engineering, Nanyang Technological Univ., Nanyang Ave., Singapore 639798. 3Assistant Manager, Dept. of Geotechnical and Tunnels, Land Transport Authority, Singapore 219428. |
| Abstract: | The excavation of soil for the construction of basements or cut-and-cover tunnels results in ground movements. One particular concern is that the excavation-induced lateral soil movements may adversely affect any nearby pile foundation. The lateral loads imposed by the soil movements induce bending moments and deflections in the pile, which may lead to structural distress and failure. This paper presents the results of an actual full-scale instrumented study that was carried to examine the behavior of an existing pile due to nearby excavation activities resulting from the construction of a 16 m deep cut-and-cover tunnel. The pile was located 3 m behind a 0.8 m thick diaphragm wall. Excavation to the formation level that was 16 m below the ground surface resulted in a maximum lateral pile movement of 28 mm. A simplified numerical procedure based on the finite-element method was used to analyze the pile response. Generally, the theoretical predictions were in reasonable agreement with the measured results. |
| Keywords: | Piles Excavation Diaphragm wall Lateral loads |