【摘要】 以榆神矿区小保当井田2-2煤层覆岩为地质原型,基于区域地质条件和3个代表性钻孔构建了30个不同岩土比类型的数值模型,运用数值模拟试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。研究结果表明:在250m和300m埋深水平下,下沉系数都会随着岩土比的增大而减小;在350m埋深水平下,下沉系数整体上呈现随岩土比增大而变小的趋势(岩土比为2∶1的点除外)。针对3种不同埋深水平建立了岩土比与下沉系数的量化关系;在不同的埋深水平下,岩土比对下沉系数的影响程度不同,随着埋深的增加,下沉系数的减小幅度基本表现为先变大后变小。更多还原

【Abstract】 Taking the overlying strata of 2-2 coal seam in Xiaobaodang mine field in Yushen mining area as geological model,30 numerical models with different rock-soil ratio were structured on the basis of regional geological conditions and 3typical drillings.With the method of numerical simulation,the effect law of the rock-soil ratio on the mining subsidence was researched under the same geological condition and mining technology.The results showed that the subsidence coefficient would decrease with the increase of the rock-soil ratio at the buried depth of 250 m and 300m;at the buried depth of 350 m,the subsidence coefficient decreased with the increase of rock-soil ratio as a whole except that the rock-soil ratio was 2∶1.The quantitative relation between the subsidence coefficient and the rock-soil ratio was built under three different depth levels.Under the different depth levels,the degree of the effect of the rock-soil ratio on the subsidence coefficient was different,and with the increase of buried depth,the decrease extent of the subsidence coefficient got bigger before it got smaller.更多还原