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| STUDY OF GROUND HEAVE AND SUBSIDENCE INDUCED BY SHIELD TUNNELLING IN SOFT GROUND |
| LIN Cungang1，2，ZHANG Zhongmiao1，2，WU Shiming3，4，LI Zongliang3，LIU Guanshui4 |
(1. Institute of Geotechnical Engineering，Zhejiang University，Hangzhou，Zhejiang 310058，China；2. Key Laboratory of Soft Soils and Geoenvironment Engineering of Ministry of Education，Zhejiang University，Hangzhou，Zhejiang 310058，China；3. Hangzhou Qingchun Road Cross-river Tunnel Co.，Ltd.，Hangzhou，Zhejiang 310002，China；4. Hangzhou Yunhe Tunnel Co.，Ltd.，
Hangzhou，Zhejiang 310002，China) |
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Abstract Additional thrust at the excavation face，friction force imposed on the around soils by shield skin and excess pressure of tail grouting can cause ground surface movements. Based on Mindlin solution，ground surface displacements induced by these three forces are calculated through numerical integration. The calculation results are verified by case studies of in-situ monitored ground surface movements in construction of Hangzhou Qingchun road river-crossing tunnel. The analysis results indicate that superposition of ground loss settlement and calculated movements due to above three forces based on Mindlin solution can be used to predict ground surface heave and subsidence induced by shield tunnelling. Ground surface heave of cross-section caused by shield tail synchronous grouting accords with Gaussian distribution. A modified Peck equation taking grouting impact into account is proposed. Compared with the conversional Peck method，modified Peck equation is able to predict ground surface heave induced by shield tunnelling；and the fitting parameters of ground surface subsidence through back analysis are more accurate.
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Received: 22 July 2011
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2011, Vol. 30 
