隧道近接桩基的安全系数研究

›› 2010, Vol. 31 ›› Issue (S2): 260-264.

隧道近接桩基的安全系数研究

王成¹，徐浩¹，郑颖人²

1. 重庆交通大学隧道及岩土工程系，重庆 400074；2. 后勤工程学院建筑工程系，重庆 400041

收稿日期:2010-04-28 出版日期:2010-12-10 发布日期:2011-01-12
作者简介:王成，男，1962年生，博士，教授，主要从事岩土工程科研与教学方面的工作。

Study of safety factor of tunnel close to pile foundation

WANG Cheng¹，XU Hao¹，ZHENG Ying-ren²

1. Department of Tunnel and Geotechnical Engineering, Chongqing Jiaotong University, Chongqing 400074, China; 2. Department of Architectural Engineering, Logistical Engineering University of PLA, Chongqing 400041, China

Received:2010-04-28 Online:2010-12-10 Published:2011-01-12

摘要/Abstract

摘要：

针对近年来隧道近接建筑桩基的情况较多，且施工控制难度大和造价高的问题十分突出。运用有限元强度折减法，基于Mohr-Coulomb强度准则，计算了多种不同情况下桩基础与隧道相互影响的隧道安全系数，包括桩基距隧道水平距离的影响、桩基埋深的影响和桩基荷载的影响。总结并提出了有实际意义的安全系数变化规律，计算表明，隧道近接桩基的临界距离为1倍洞径，当隧道与桩基水平距离大于1倍洞径时，桩基与隧道之间的相互影响可以忽略不计；桩基荷载的变化对隧道安全系数有较大影响，荷载增大1倍，安全系数约减小1/4。结论为隧道近接桩基工程建设提供参考依据。

关键词: 隧道近接桩基, 有限元强度折减法, 安全系数, 浅埋隧道

Abstract:

Recently, cases of excavation tunnel close to pile foundations have significantly increased. Problems are arising with its difficult construction controlling and high costs. In this paper, the safety factors of interaction between the tunnel and pile foundation are computed by using the strength reduction FEM in a variety of different cases based on the Mohr-Coulomb strength criterion. Those cases include the level distant between the pile and the tunnel, the imbedded depth of pile and the loads of pile. Practical rules of the variation of the safety factors are summarized from the computed results. It is shown that the critical level distance of pile away from the side wall of tunnel is one time width of tunnel. The influences of the pile-tunnel interaction can be ignored while the level distant of the pile-tunnel is more than one time width of tunnel. The loads on the pile foundation have important influences on the safety factor of the tunnel. The safety factor will decreased about 1/4 while the loads on the pile is increased about one time. The conclusions provide strong references for constructions of excavation tunnel close to piles.

Key words: excavation tunnel close to pile, strength reduction FEM, safety factor, shallow tunnel

中图分类号:

U 452

王成，徐浩，郑颖人. 隧道近接桩基的安全系数研究[J]. , 2010, 31(S2): 260-264.

WANG Cheng，XU Hao，ZHENG Ying-ren. Study of safety factor of tunnel close to pile foundation[J]. , 2010, 31(S2): 260-264.

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