软弱覆岩下煤柱开采注浆减沉技术及应用

Grouting and Sinking Reduction Technology and Application for Coal Pillar Mining Under Weak Overlying Rock

为保障软弱覆岩条件下开采工业广场煤柱注浆充填减沉效果,采用弯曲下沉带充填层注浆方法,将注浆充填过程分为注前、试注、动态充填、后方充填和压实排水五个阶段,并确定各阶段注采比取值范围,在回采过程中进行注浆充填减沉。结果表明:压煤区注浆充填后地面抬升0~150 mm,工广建筑物抬升控制在0~10mm,回收了建筑物下煤炭资源。

In order to ensure the effect of grouting and filling in reducing subsidence of coal pillars in mining industrial squares under weak overlying rock conditions,a curved subsidence zone filling layer grouting method is adopted.The grouting and filling process is divided into five stages:pre injection,trial injection,dynamic filling,rear filling,and compaction drainage.The range of grouting and mining ratio values for each stage is determined,and grouting and filling are carried out to reduce subsidence during the mining process.The results show that after grouting and filling in the coal pressing area,the ground is raised by 0-150 mm,and the uplift of industrial squares buildings is controlled at 0-10 mm,recovering coal resources under the buildings.