充填体应力分布理论分析及数值模拟对比研究  

A Comparative Study on the Stress Distribution in Mine Backfill Through Theoretical and Numerical Analysis

作　　者：闫保旭 朱万成[1] 侯晨 贾瀚文 YAN Bao-xu;ZHU Wan-cheng;HOU Chen;JIA Han-wen(School of Resources & Civil Engineering,Northeastern University,Shenyang 110819,China)

机构地区：[1]东北大学资源与土木工程学院

出　　处：《东北大学学报（自然科学版）》2019年第12期1773-1778,共6页Journal of Northeastern University(Natural Science)

基　　金：国家重点研发计划项目(2016YFC0801607);国家自然科学基金资助项目(51525402,51874069,51761135102);中央高校基本科研业务费专项资金资助项目(N170108028,N170106003)

摘　　要：考虑充填采场上下盘倾角不等,以及围岩与充填体交界面处由于剪切摩擦作用力会发生主应力方向的偏转,在土力学理论的基础上,引入考虑主应力方向发生偏转时的侧压力系数;同时考虑水平微分单元体的受力平衡,推导得出了充填体中的竖向应力解析表达式.研究表明:考虑主应力方向发生偏转时的侧压力系数随采场高度发生变化;当充填采场下盘倾角相同时,上盘倾角越大,由围岩与充填体交界面处摩擦力引起的主应力方向偏转程度越小,成拱效应越不显著;充填体与围岩交界面处的摩擦角对充填体内部的成拱效应影响较大,而充填体的内聚力对成拱效应影响相对较小.Rotation of principal stress direction can occur due to the shear friction between the surrounding rock and the backfill,as well as the unequal wall inclinations of the backfilled stope.According to soil mechanics,the lateral pressure coefficient was introduced to consider the variation of the direction of the principal stress.Based on the force balance of the horizontal differential element,the analytical solution of vertical stress in backfill was derived.The results show that the introduced lateral pressure coefficient is a function of the backfilled stope height.For a constant footwall inclination angle,the larger the hang wall inclination angle is,the smaller the direction of the principal stress deflects due to the frictional forces in the interface between the surrounding rock and the backfill.Compared with the cohesion in the backfill,the friction angle at the interface between the backfill and the surrounding rock has a obvious influence on the arching effect of the backfill.

关 键 词：充填体 侧压力系数 理论解 数值模拟 成拱效应 

分 类 号：TD853.34[矿业工程—金属矿开采]