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.
出处
《煤炭工程》
北大核心
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)
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
non - uniform stress field
mine circular type roadway
plastic zone in surrounding rock
lateral pressurecoefficient
centre main stress
