软弱岩体中圆形隧道挤压变形临界应变研究

长江科学院院报 ›› 2010, Vol. 27 ›› Issue (2): 42-45.

软弱岩体中圆形隧道挤压变形临界应变研究

温森, 张建伟

出版日期:2010-02-01 发布日期:2010-02-01

Critical Strain of Circular Tunnel Squeezing Deformationin Weak Rock Mass

WEN Sen, ZHANG Jian-Wei

Published:2010-02-01 Online:2010-02-01

摘要/Abstract

摘要： 预测隧道挤压程度对设计者至关重要，因此对挤压状态临界应变的研究是很必要的。由于软弱岩体中Q或RMR岩体分类使用效果欠佳，引入GSI代替Q或RMR，并在前人的基础上推导了圆形隧道发生挤压变形的临界应变公式。采用工程实例进行了验证，计算结果符合实际观测结果。最后，依据Hoek－Brown强度准则推导了静水压力状态下圆形隧道挤压变形的临界应变解析表达式。对于埋深很深的隧道，侧压系数近似为1，因此可以采用推导的解析解确定隧道挤压状态。

Abstract: It’s very important to predict the squeezing level of a tunnel for designer, so it’s necessary to study the critical strain of squeezing state. The use of Q and RMR can’t get ideal effect in weak rock mass, so GSI is introduced to replace the Q and RMR. The formula of critical strain is deduced based on other research results. An engineering example is used to demonstrate the formula and the calculated result is consistent with the practically observed result. In the end, according to Hoek-Brown strength criterion, the analytical formula which expresses the critical strain in squeezing state of a circular tunnel is derived in hydrostatic pressure state. The side-pressure coefficient is nearly equal to 1 in deep buried tunnel, so the analytical solution can be used to determine the squeezing state of tunnel.

温森, 张建伟. 软弱岩体中圆形隧道挤压变形临界应变研究[J]. 长江科学院院报, 2010, 27(2): 42-45.

WEN Sen, ZHANG Jian-Wei. Critical Strain of Circular Tunnel Squeezing Deformationin Weak Rock Mass[J]. Journal of Changjiang River Scientific Research Institute, 2010, 27(2): 42-45.