深部岩巷底鼓机理及底板超挖锚注回填技术

Floor Heave Mechanism and Over-Excavation & Grouting-Backfilling Technology in Rock Roadway of Deep Mine

基于深部软岩巷道底鼓问题严重这一状况,以望峰岗矿深部岩巷条件为工程背景,对如何有效控制深部软岩巷道的底鼓问题进行了试验研究.通过对底鼓影响因素的理论分析和原支护效果的数值模拟以及底板岩层移动规律的现场实测,掌握了底板无支护条件下巷道围岩塑性区范围、围岩变形移动规律和巷道周边应力分布状况,提出并试验了控制深部岩巷底鼓的新方法-超挖锚注回填技术.试验结果表明该技术取得了良好的底鼓控制效果,巷道底板基本无鼓起,取得了显著的经济和社会效益.

Based on the fact that the floor heave of soft rock roadway in deep mine is quite serious,we study factors of effectively controlling the floor heave in deep soft roadway in Wangfenggang coal mine.By numerical modeling with FLAC and in-situ measuring,we obtain the plastic region,laws of deformation and movement,and stress distribution around the roadway of which the floor is not supported.In addition,we propose a new method,the over excavation and grouting-backfilling technology,to control the floor heave.The experiment of this new method shows that good effect of floor heave controlling is obtained and the floor heave convergence is small.