文档介绍：第 31 卷增刊 2 岩土力学
2010 年 11 月 Rock and Soil Mechanics Nov. 2010
文章编号:1000-7598 (2010)增刊 2-0260-05

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)

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
中图分类号:U 452 文献标识码:A

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)

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
puted 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 th