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.
林存刚1,2,张忠苗1,2,吴世明3,4,李宗梁3,刘冠水4. 软土地层盾构隧道施工引起的地面隆陷研究[J]. 岩石力学与工程学报, 2011, 30(12): 2583-2592.
LIN Cungang1,2,ZHANG Zhongmiao1,2,WU Shiming3,4,LI Zongliang3,LIU Guanshui4. STUDY OF GROUND HEAVE AND SUBSIDENCE INDUCED BY SHIELD TUNNELLING IN SOFT GROUND. , 2011, 30(12): 2583-2592.
PECK R B. Deep excavations and tunneling in soft ground[C]// Proceedings of the 7th International Conference on Soil Mechanics and Foundation Engineering. Mexico:[s.n.],1969:225-290.
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