考虑中间主应力的非均匀应力场圆形巷道围岩塑性区分析  

Analysis on Plastic Zone in Surround Rock of Mine Circular Type Gateway in Non-Uniform Stress Field with Centre Main Stress Considered

作　　者：李涛[1] 赵光明[1,2] 孟祥瑞[1] 张小波[1] 

机构地区：[1]安徽理工大学能源与安全学院,安徽淮南232001 [2]重庆大学西南资源开发及环境灾害控制工程教育部重点实验室,重庆400044

出　　处：《煤炭工程》2014年第3期68-71,共4页Coal Engineering

基　　金：国家自然科学基金项目(51174005;51134012;51374013);霍英东青年教师基金基础性研究课题(121050);安徽高校省级自然科学研究重点项目(KJ2011A085);教育部科学技术研究重点项目(210096)

摘　　要：基于Drucker-Prager准则,引入中间主应力系数,推导出不同侧压系数下巷道围岩塑性区边界线方程,用于预测不同侧压系数下巷道围岩塑性区的大小和形状。用单因素分析法,考虑不同中间主应力下,巷道围岩塑性区半径的变化规律。在侧压系数λ=1的时候,对在D-P准则下和在Mohr-Coulomb准则下巷道围岩塑性区的大小进行比较。侧压系数越偏离于1,巷道围岩塑性区水平方向和垂直应力侧差异增加,对围岩塑性区的大小和形状影响也越大;随中间主应力增大,塑性区范围越小。Based on the Drucker - Prager criterion, with the introduction of the centre main stress coefficient, a boundary line equation of the plastic zone in the surrounding rock of the mine roadway under different lateral pressure coefficients was derived and applied to predict the size and shape of the plastic zone in the surrounding rock of the mine roadway under different lateral pressure coefficient. A single factor analysis method was applied the radius variation law of the plastic zone in the surrounding rock of the mine roadway in consideration of the different centre main stress. In consideration of the lateral pressure coefficient, under the D - P criterion and Mohr - Coulomb criterion, a comparison was conducted on the size of the plastic zone in the surrounding rock of the mine roadway. When the lateral pressure coefficient more drifted to l, the lateral difference of the horizonta! and vertical stress in the plastic zone of the mine roadway surrounding rock would be increased and would be highly affected to the size and shape of the plastic zone in the surrounding rock. With the centre main stress increased, the scope of the plastic zone would be reduced.

关 键 词：非均匀应力场 圆形巷道 围岩塑性区 侧压系数 中间主应力 

分 类 号：TD313[矿业工程—矿井建设]