基于D-P准则巷道围岩力学响应特征分析

Mechanical Response Characteristic of Roadway Surrounding Rock Based on D-P Criterion

基于D-P准则对巷道围岩力学特征进行了不同侧压系数的弹塑性分析,与基于Mobr-Coulomb准则的计算结果进行了对比分析,并对不同侧压系数下巷道围岩开挖后的应力场、位移场、塑性变形区进行了数值模拟研究。结果表明:巷道围岩应力场、位移场、塑性变形区均呈对称性分布;侧压系数λ<1时,随着λ的增大,应力峰值、应力集中程度、垂直位移量及垂直位移场的范围逐渐减小,巷道围岩塑性变形区亦逐渐减小。当0.1<λ<0.5时,巷道围岩应力和位移减小幅度较大,应力和位移对侧压系数的敏感性较大,当0.5<λ<1时,巷道围岩应力和位移减小幅度较小,应力和位移对侧压系数的敏感性较小。

Elastic and plastic analysis of different horizontal pressure coefficients was made for mechanical characteristic of roadway surrounding rock based on D-P criterion.Compared with result from Mohr-Coulomb criterion, stress field, displacement field and plastic deformation zone was numerically simulated under different horizontal pressure coefficients after roadway was excavated .Results showed that stress field, displacement field and plastic zone took on symmetrical distribution.When horizontal pressure coefficient λ＆lt;1, withλincreasing, stress summit value, stress concentration degree , vertical displacement and its range gradually reduced , plastic zone also reduced.When 0.1＆lt;λ＆lt;0.5 , reduction degree of stress and displacement was large , sensitivity of stress and displacement for horizontal pressure coefficient was large.When 0.5＆lt;λ＆lt;1, reduction degree of stress and displacement was small , their sensitivity was small.