防灾减灾工程学报2012，Vol.32Issue(2)：131-137,7.
基于非线性屈服准则及主应力判据的圆形巷道围岩岩爆过程的数值模拟
Numerical Simulation of Rockburst Process of Surrounding Rock in Circular Tunnel Based on Nonlinear Yielding and Principal Stress Criteria
摘要
Abstract
Linear Mohr-Coulomb criterion with tension cut-off cannot consider the nonlinear yielding characteristics of rocks at high stresses. According to Hoek-Brown criterion, the linear Mohr-Coulomb criterion was modified as a nonlinear criterion in the compressive region. Three kinds of principal stress criteria of rockbursts were introduced to assess the distribution and evolution of weak, moderate and serious rock-bursts in the surrounding rock of a circular tunnel, respectively. In numerical simulation, a circular tunnel is excavated after the plane strain model has reached a static equilibrium state. Rock obeys an elastic-brittle-plastic constitutive model. It is found that the number of elements occurring serious rockburst is less than that of elements occurring weak rockbursts. Regions where weak rockbursts occur are very similar to plastic zones and zones with high shear strain increments. According to Barton criterion, the area of serious rockburst zones is larger and serious rockbursts in tension predominate. The numbers of elements occurring moderate and weak rockbursts based on Tao' s criterion are greater than those based on Gu and Tao' s criterion. For rockbursts in shear, serious rockbursts occur within the surrounding rock, while weak rockbursts can occur at the surface of the tunnel.关键词
非线性屈服准则/圆形巷道/莫尔-库仑准则/虎克-布朗准则/岩爆判据Key words
nonlinear yielding criterion 5 circular tunnel/ Mohr-Coulomb criterion/ Hoek-Brown criterion/ rockburst crite-rion分类
矿业与冶金引用本文复制引用
王学滨,陶帅,潘一山,王玮..基于非线性屈服准则及主应力判据的圆形巷道围岩岩爆过程的数值模拟[J].防灾减灾工程学报,2012,32(2):131-137,7.基金项目
国家自然科学基金项目(50974069)、国家重点基础研究发展计划项目(2010CB226803)资助 （50974069）
