非平行壁面采场充填体三维应力分布规律研究*

为研究上下盘非平行壁面倾斜采场充填体应力分布规律，选取倾斜采场中三维水平充填层作为微分计算单元，基于极限平衡法考虑其竖直方向的受力平衡，提出非平行壁面的倾斜采场充填体的三维应力解析解，并分析不同参数对应力分布规律的影响。研究结果表明:三维条件下非平行壁面倾斜采场充填体竖向应力分布形式同平面应变条件下类似，在计算深度较小时竖向应力为近线性分布，随着计算深度的增加竖向应力增加率逐渐减小，但应力数值相对平面应变条件下较低。上盘倾角一定时，下盘倾角越大则拱效应越不明显；采场高度一定时，高宽比越大，拱效应越显著。充填体—围岩界面内摩擦角对充填体内拱效应影响较大，界面黏聚力和充填体抗剪强度参数对充填体应力分布影响相对较小。研究结果可为充填体强度设计提供参考。

Study on three-dimensional stress distribution law of filling body in non-parallel wall stope

In order to study the stress distribution law of the filling body in the inclined stope with non-parallel wall of the hanging wall and footwall,taking the three-dimensional horizontal filling layer in the inclined stope as the differential calculation unit,and considering the force balance in the vertical direction based on the limit equilibrium method,the three-dimensional stress analytical solution of the filling body in inclined stope with non-parallel wall was proposed,and the influence of different parameters on the stress distribution law was analyzed.The results showed that the vertical stress distribution of filling body in the inclined stope with non-parallel wall under three-dimensional conditions was similar to that under plane strain condition.When the calculation depth was small,the vertical stress was nearly linear distribution.With the increase of calculation depth,the increase rate of vertical stress gradually decreased,but the stress value was lower than that under plane strain condition.When the hanging wall inclination was constant,the greater the footwall inclination,the less obvious the arch effect.When the stope height was constant,the greater the height-width ratio,the more significant the arch effect.The internal friction angle of the interface between filling body and surrounding rock had great influence on the arch effect in the filling body,while the interface cohesion and the shear strength parameters of the filling body had relatively small influence on the stress distribution of filling body.The research results can provide reference for the strength design of filling body.