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| 3-D FEM Back-Analysis of an Over Size and Deep Excavation |
| ZHANG Jun-Feng-1, WANG Jian-Hua-1, CHEN Jin-Jian-1, HOU Yong-Mao-2 |
| （1. Department of Civil Engineering, Shanghai Jiaotong University, Shanghai 200240, China; 2. Shanghai Tunnel Engineering Co. Ltd., Shanghai 200082, China） |
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Abstract The three dimensional finite element model was built up to simulate an over size and deep excavation traversing shield tunnels, and the effects on surroundings and tunnel heave due to excavation were analyzed. From monitored retaining wall horizontal displacements and tunnel heave, a simplex method was employed for back analysis of soil parameters. According to the backanalysis program based on simplex method, optimized soil parameters were attained after finite element analysis. The final tunnel heave was predicted by the optimized soil parameters. The results show that the predicted tunnel heave is close to monitored data, which guarantees the effectiveness of back analysis by this paper.
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Received: 04 June 2011
Published: 30 January 2012
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