摘要
基于Mogi-Coulomb强度准则推导了两向非等压下的圆形巷道塑性区隐式边界方程,分析了岩石内聚力、内摩擦角、中间主应力对塑性区的影响.研究表明:内聚力与内摩擦角均不改变塑性区的形态仅对塑性区的大小有影响,随着内聚力的增大,塑性区的半径逐渐减小,且随着内聚力的增大,塑性区半径减小的速度增加;内摩擦角与塑性区半径变化趋势相反,且塑性区半径减小的速度随内摩擦角的增大而减小;当中间主应力系数小于一定值时,随着中间主应力系数增大,塑性区的半径减小,当中间主应力系数超过一定值时,随着中间主应力系数增大塑性区的半径却开始增大.因此在巷道围岩支护设计中适当考虑中间主应力的作用对巷道围岩的稳定具有重要意义.
Based on the Mogi-Coulomb strength criteria, an implicit boundary equation for the plastic region of a circular road under uneven pressure in two directions is derived, and the effects of rock agglomeration, internal friction angle, and intermediate principal stress on the plastic region is analyzed. Studies have shown that neither cohesive force nor internal friction angle, but the size of the plastic zone changes the shape of the plastic zone. As the cohesive force increases, the radius of the plastic zone gradually decreases, and as the cohesive force increases, the radial deceleration rate of the plastic zone increases. The tendency of the internal friction angle and the radius of the plastic region to change is opposite, and the decrease rate of the radius of the plastic region decreases as the internal friction angle increases. If the intermediate principal stress factor is less than a certain value, the intermediate principal stress factor is proportional to the size of the plastic zone. Negative correlation, if the intermediate principal stress factor exceeds a certain value, the intermediate principal stress coefficient and the plastic zone The size is positively correlated. Therefore, proper consideration of the effects of intermediate principal stresses in the support design of rocks around the roadway is very important for the stability of the rocks around the roadway.
作者
欧阳蕊灿
王卫军
OUYANG Ruican;WANG Weijun(School of Resources,Environment and Safety Engineering,Hunan University of Science and Technology,Xiangtan 411201,China)
出处
《矿业工程研究》
2021年第4期1-6,共6页
Mineral Engineering Research
基金
国家自然科学基金资助项目(52074115)。
