榆神矿区覆岩岩土比对开采沉陷的影响分析

Influence Analysis of Overburden Rock-soil Ratio on Mining Subsidence in Yushen Coal Mining Area

以榆神矿区大保当普查区为研究区,分析了区域地质条件和典型钻孔数据资料,针对该矿区主采煤层构建了不同岩土比类型的数值模型,运用数值模拟实验的方法研究在地质条件和开采工艺相同的情况下,覆岩岩土比对开采沉陷的影响规律。结果表明：在不同的埋深水平下,下沉系数都会随着岩土比的增大而减小,且变化趋势有所不同;随着岩土比的增大,采高对下沉系数的影响程度呈现先增大后减小的变化趋势,一般当岩土比为4∶1-8∶1时,采高的变化对下沉系数的影响程度最大;基于数值模拟实验结果,发现超过100 m的巨厚土层具有降低下沉系数的效应。

Taking Dabaodang survey area of Yushen Coal Mining Area as study area, according to the regional geological occurrence conditions and typical drillings data, the influence laws of the rock -soil ratio impaeting the mining subsidence is researched with the method of numerical simulation under the same geological conditions and mining technology. The results show that： in different depth levels, the subsidence coefficient couht decrease with the increase of the rock - soil ratio, and the change process of the rock - soil raft- o impacting subsidence coefficient is different; in the different depth levels, with the increase of the rock -soil ratio, this influence ex- tent presents the trend of becoming larger firslly aml Ihen smaller, and becomes largest generally while the rock - soil ratio is from 4：1 to 8： 1. Aceording to the results of numerical simulation, the giant thick soil Ihat is more than 100 m could cut down the subsidence coefficient.