摘要
针对隧道修建过程中进洞段围岩稳定性相对较差的问题,基于Mohr-Coulomb屈服准则建立单元点安全系数定量计算方法,用于评估隧道洞口段的安全稳定性。该点安全系数计算方法基本原理是通过计算一点的应力Mohr圆到材料强度特征线的距离获得。西气东输二线工程二妹顶山隧道进洞段分步开挖过程中,对洞口段岩体的点安全系数演化过程的分析和对围岩支护参数的优化设计实践表明,该方法不仅可以方便地评价隧道洞口段的稳定性,还可为隧道洞口段围岩支护设计提供科学参考。
Considering the problem of instability of heading slope in opening of tunnel,a new quantitative safe index,named point safety factor,is put forward based on Mohr-Coulomb yield criterion.The point safety factor is gained by calculating the distance from the Mohr circle of stress to strength line of material.Application of a typical heading slope of tunnel at West-East natural gas transmission project engineering indicates that the point safety factor is convenient and scientific to evaluate the safety of heading slope during excavation of tunnel.
出处
《土工基础》
2010年第1期8-11,共4页
Soil Engineering and Foundation
关键词
进洞口
点安全系数
支护优化
opening of tunnel
safety factor of point
optimization of supporting
heading slope
