考虑侧壁摩擦的采场矿沟顺序填埋计算分析  

Calculation analysis of mine stope in ordered backfills considering the friction of side wall

作　　者：张常光[1] 蔡明明 祁航 ZHANG Chang-guang;CAI Ming-ming;QI Hang(School of Civil Engineering, Chang an University, Xi an 710061,China)

机构地区：[1]长安大学建筑工程学院

出　　处：《广西大学学报（自然科学版）》2019年第4期1031-1037,共7页Journal of Guangxi University（Natural Science Edition）

基　　金：国家自然科学基金资助项目(41202191);中央高校基本科研业务费专项资金项目(310828173402)

摘　　要：为研究矿沟施工顺序及应力状态对采场填埋设计的影响,考虑实际两次填埋过程中矿沟下部填埋料所形成的较高黏聚力和矿石侧壁对填埋体所产生的竖向摩擦力的综合影响,对假定一次填埋完成的经典Mitchell解答进行修正,获得了填埋料所需黏聚力和填埋体安全系数的解析新表达式,并结合工程算例探讨了矿沟深度与侧壁摩擦角的影响特性。研究结果表明:下部填埋料的较高黏聚力能降低上部填埋料所需的黏聚力,这有利于降低填埋成本;矿沟深度对填埋计算的影响显著,填埋料所需黏聚力随侧壁摩擦角的增加而减小,而填埋体安全系数随侧壁摩擦角的增加而增大。本文结果可为矿沟填埋优化设计提供有益的参考。In order to study the influences of backfilled order and stress state on the mine stope design, both a larger cohesion of bottom backfill arising from two backfilled orders and the vertical friction of side wall are considered. Some modifications are made to the traditional solution proposed by Mitchell et al, and then new solutions for the required cohesion and safety factor of the backfill are presented. The effects of the stope depth and friction angle of side wall are discussed. The obtained results show that a smaller required cohesion of upper backfill is achieved due to the lager cohesion of bottom backfill, which can bring lower backfill cost;the influence of stope depth on the backfill design is significant. The required cohesion of upper backfill decreases with increasing the friction angle of side wall, whereas the variation of safety factor is on the opposite. The results obtained in this study can provide useful references for an optimal design of backfilled stope.

关 键 词：矿沟填埋 填埋顺序 侧壁摩擦 所需黏聚力 安全系数 

分 类 号：TD853[矿业工程—金属矿开采]