摘要
为了研究在强度折减法下的掌子面稳定性问题,基于极限分析上限定理,把切线法引入刚性块体的非线性破坏机制,同时结合强度折减理论,构建了掌子面安全系数上限解的目标函数。运用Matlab中的fmincon函数对目标函数进行优化,获得掌子面稳定安全系数的最小上限解,并研究了各参数对掌子面安全系数的影响。结果表明:隧道埋深越大其安全系数呈线性减小;随着土体容重的增加安全系数呈减小趋势。此外,掌子面的安全系数对非线性系数m的敏感性也不同,随着土体容重的增加,非线性系数m对掌子面稳定安全系数的影响减小。
In this paper,the stability of tunnel face is studied under the strength reduction method.Based on the upper bound theorem of limit analysis,the tangential method is introduced into the nonlinear failure mechanism of the rigid block.Combining the strength reduction theory,the objective function of the upper bound solution for the safety factor of tunnel face is constructed.The fmincon function in Matlab is used to optimize the objective function,and the minimum upper bound solution can be obtained.The influence of each parameter on the safety factor of tunnel face is also studied.The results show that the safety factor decreases linearly with the increase of the buried depth of the tunnel.The safety factor decreases with the increase of soil bulk density.In addition,the sensitivity of the safety factor of tunnel face to the nonlinear coefficient m is different.With the increase of soil bulk density,the influence of the nonlinear coefficient m on the safety factor of tunnel face is reduced.
作者
章志刚
ZHANG Zhigang(Xiamen Rail Transit Group Co.,Ltd.,Xiamen 361004,Fujian,China)
出处
《路基工程》
2018年第2期188-192,共5页
Subgrade Engineering
关键词
非线性破坏准则
强度折减法
上限分析
掌子面安全系数
nonlinear failure criterion
strength reduction method
upper bound analysis
safety factor of tunnel face
