水资源与水工程学报

文章摘要

TAO Shuai,WANG Xuebin,PAN Yishan,WANG Wei.线性及非线性屈服函数交界处临界应力对隧洞围岩力学行为的影响Journal of Water Resources and Water Engineering[J].,2011,22(2):

线性及非线性屈服函数交界处临界应力对隧洞围岩力学行为的影响

Effects of critical stress corresponding to the tangential point between linear and nonlinear yield functions on the mechanical behavior of tunnel surrounding rock

DOI：

中文关键词: 临界应力塑性区位移剪切应变增量侧压系数

英文关键词: critical stress plastic zone displacement shear strain increment lateral confining coefficient

基金项目:国家自然科学基金，辽宁省教育厅高等学校科研项目，国家重点基础研究发展计划

Author Name	Affiliation
TAO Shuai,WANG Xuebin,PAN Yishan,WANG Wei	TAO Shuai,WANG Xuebin,PAN Yishan,WANG Wei(College of Mechanics and Engineering,Liaoning Technical University,Fuxin 123000,China)

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中文摘要:

利用C++对FLAC中的双线性的莫尔-库仑及非线性的虎克-布朗屈服函数进行了复合,复合后的线性及非线性屈服函数交界处的临界应力对计算结果的影响是一个值得研究的问题.针对圆形巷道围岩的塑性区、应力、位移及剪切应变增量进行了数值计算.计算结果表明,随着临界应力的值的增加,隧洞围岩的塑性区尺寸、被监测单元或节点的剪切应变增量及位移减小;塑性区内的被监测单元的应力增加.这是由于随着临界应力的值的增加,本文提出的非线性本构模型中线性剪切屈服部分的屈服极限提高所致.在高地应力(莫尔-库仑本构模型不再适用)及侧压系数不为1时的计算结果表明,隧洞围岩发生了拉破坏,非线性的虎克-布朗本构模型不能预测出这一点.

英文摘要:

Bilinear Mohr-Coulomb and nonlinear Hoek-Brown yield functions are combined in FLAC using C++.Influence of the critical stress corresponding to the tangential point of linear and nonlinear yield functions on numerical results is a key problem.Surrounding rock with a circular tunnel is modeled and results of plastic zones,stresses,displacements and shear strain increments are obtained.Results show that the plastic zone radius,the shear strain increment of monitored elements and the displacement of monitored ...

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