置换条带开采中充填体强度分析

Analysis on Backfill Material Strength of Replacement for Belt Coal Pillar Mining

为了进一步提高煤炭资源的采出率、实现安全开采,通过对原建筑物下以及水体上留设条带煤柱的水文地质条件分析,提出了利用高水材料充填置换煤柱进行二次复采的技术思路;并基于工程力学对充填体强度及其安全性进行了分析研究。结果表明,采用全采全充方式、充填体材料强度大于2 MPa、复采的工作面宽度20 m、充填体与小煤柱的宽度为25 m的情况下,可以实现建筑物下与承压水上安全开采。

In order to further improve the recovery rate of the coal resources and to have a safety mining,with the analysis on the hydrological conditions of the belt coal pillars left under the previous building structures and under the water bodies,the paper proposed the technical idea with the high water material backfill to replace the coal pillars for the secondary mining.An analysis study was conducted on the strength and safety of the backfill material based on the engineering mechanics.The results showed that under the conditions of the backfill material strength over 2 MPa,the face width of the secondary mining about 20 m and the width of the backfill material and the coal pillar about 25 m,the full mining and full backfill method could have a safety mining under the building structures or above the pressurized water strata.