倾斜充填采场底板应力成拱估计及自立稳定性分析  

Estimation of Stress Arching Effect and Analysis of Self-Supporting Stability in Inclined Filling Stope Floor

作　　者：刘焕新 吴钦正 尹延天 闫保旭 LIU Huanxin;WU Qinzheng;YIN Yantian;YAN Baoxu(School of Civil and Resource Engineering,University of Science and Technology Beijing,Beijing 100083,China;Deep Mining Laboratory,Shandong Gold Group Co.,Ltd.,Laizhou,Shandong 261442,China;College of Energy Engineering,Xi’an University of Science and Technology,Xi’an,Shaanxi 710054,China)

机构地区：[1]北京科技大学土木与资源工程学院,北京100083 [2]山东黄金集团有限公司深井开采实验室,山东莱州市261442 [3]西安科技大学能源学院,陕西西安710054

出　　处：《矿业研究与开发》2022年第3期179-185,共7页Mining Research and Development

基　　金：中国博士后科学基金面上项目(2021M702015,2021MD703874)。

摘　　要：充填是金属矿山地下开采常用的采场地压管理方式,关键是研究充填体应力变化规律以及充填体受开挖影响产生暴露面后的自立稳定性。基于充填体中的应力成拱效应,运用极限平衡和数值模拟方法,分析了倾斜采场充填体中的应力分布规律与不同充填采场三维几何尺寸的关系;在考虑充填采场水力半径条件下,得出预估充填采场底板竖向应力的表达式;通过考虑充填体中应力成拱效应时得到的应力分布表达式,运用极限平衡以及数值模拟方法,分析了二步倾斜采场充填体具有自由暴露面时的自立稳定性,得到了充填体作为自立稳定人工矿柱时所需的黏聚力,研究成果可为金属矿山充填挡墙的初步设计提供理论依据。Backfill is a common method for stope ground pressure management in underground mining of metal mines.The key issues are the stress distribution in backfill and the self-supporting stability of filling body after forming the exposed surface under the influence of excavation.Based on the stress arching effect in the filling body,the relationship between stress distribution in the filling body of inclined stope and three-dimensional geometric size of different filling stopes was analyzed by using limit equilibrium and numerical simulation.Considering the hydraulic radius of the filling stope,the expression for estimating vertical stress of filling stope floor was obtained.Based on the stress distribution expression obtained by considering the stress arching effect in the filling body,the self-supporting stability of the filling body in two-step inclined stope with free exposed surface was analyzed by using limit equilibrium and numerical simulation.And the cohesion of filling body as a self-supporting artificial pillar was obtained.The research results can provide a theoretical basis for the preliminary design of filling retaining wall in metal mines.

关 键 词：充填体 数值模拟 水力半径 自立稳定性 应力分布 

分 类 号：TD853.34[矿业工程—金属矿开采]