摘要
为了分析岩土体的非线性破坏特性对盾构隧道的开挖面极限支护力的影响,利用FLAC3D提供的二次开发平台,开发基于非线性Mohr-Coulomb破坏准则的自定义本构模型。调用该本构模型对盾构隧道的施工过程进行数值模拟,得到非线性M-C破坏准则作用下盾构隧道开挖面极限支护力的数值解。利用切线法将非线性Mohr-Coulomb破坏准则引入上限分析的能耗计算中,获得非线性破坏准则作用下盾构隧道开挖面支护力的上限解。通过将数值解和上限解进行对比,证明采用自定义本构模型计算的盾构隧道开挖面极限支护力是正确的。
To study the influence of nonlinear failure characteristics on the ultimate support pressure of shield tunnel face,the user-defined constitutive model subjected to nonlinear failure criterion was developed by using the further developing platform in FLAC3 D.By invoking the constitutive model to simulate the excavation of a shield tunnel,the numerical solution of ultimate support pressure subjected to nonlinear failure criterion was ob-tained.Furthermore,the nonlinear failure criterion was introduced into the energy calculation by generalized tan-gential technique,and the upper bound solution of ultimate support pressure for shield tunnel was derived.By comparing the numerical solution and upper bound solution,the validity of ultimate support pressure calculated by user-defined constitutive model was proved.
出处
《铁道科学与工程学报》
CAS
CSCD
北大核心
2016年第5期891-897,共7页
Journal of Railway Science and Engineering
基金
国家自然科学基金资助项目(51308072
51278071)
长沙理工大学桥梁工程安全控制技术与装备湖南省工程技术研究中心开放基金资助项目(13KC04)
湖南省科技计划重点项目经费资助项目(2014FJ2005)
关键词
开挖面极限支护力
非线性破坏准则
数值模拟
极限分析上限定理
ultimate support pressure of tunnel face
nonlinear failure criterion
numerical simulation
upper bound theorem of limit analysis
