PREDICTION AND ANALYSIS OF LONG-TERM SURFACE SETTLEMENT CAUSED BY SHIELD TUNNELING SIDE-CROSSING ADJACENT ANCIENT BUILDINGS
ZHANG Dengyu1，2，ZHANG Zixin1，2，WU Changjiang3
(1. College of Civil Engineering，Tongji University，Shanghai 200092，China；2. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education，Tongji University，Shanghai 200092，China；3. Shanghai Institute of Architectural Design
and Research Co.，Ltd.，Shanghai 200041，China)
Abstract：Based on the project of Shanghai metro line 11's side-crossing the St. Ignatius Cathedral，some helpful predications and deep analysis about long-term surface settlements have been presented by employing numerical simulation approaches and in-situ measurement techniques. Furthermore，the strengthening effects of MJS piles and the complicated influences of adjacent architectures are evaluated and calculated prudently. The computation results indicate that long-term surface settlement increases gradually over time and achieves stabilization ultimately. Due to the existence of MJS piles and adjacent buildings，the settlement trough significantly differs from traditional forms and performs a remarkable asymmetry. Particularly，it should be emphasized that those MJS piles effectively protect the surrounding region from large settlements and other harmful effects. The numerical simulation results and in-situ measurement data reveal a matching physical discipline；so the method of numerical simulation is validated scientifically and reasonably. Finally，several influences which contribute to the long-term settlement are analyzed：MJS pile reinforcement，building，disturbed region and creep parameters. Obviously，the achievement in this paper would provide a valuable reference for future similar projects.
SHIRLAW J N. Observed and calculated pore pressures and deformations induced by an earth balance shield：discussion[J]. Canadian Geotechnical Journal，1995，32(1)：181-189
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2011, Vol. 30 
