大保当井田覆岩岩土比对开采沉陷的影响
Influence of Overburden Rock-soil Ratio on Mining Subsidence in Dabaodang Coal Field
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摘要: 以榆神矿区大保当井田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100 m和200 m埋深水平下，随着岩土比的增大，下沉系数呈现较为明显的减小趋势，而在250 m埋深水平下，除各别点外（岩土比为2∶1时）也基本符合该规律；不同埋深水平条件下，随岩土比增大，下沉系数的减小幅度不同；基于数值模拟实验结果，超过80 m的厚土层具有降低下沉系数的效应。Abstract: Taking the overburden of 2-2 coal in Dabaodang Mine Field of Yushen Coal Mining Area as geological prototype, 30 numerical models with different rock-soil ratio are established on the basis of regional geological occurrence conditions and 3 typical drillings. With the method of numerical simulation, the influence law of rock-soil ratio on the mining subsidence is researched under the same geological condition and mining technology. The results show that the subsidence coefficient could decrease with the increase of the rock-soil ratio in the 100 m and 200 m depth level; the overall trend of the subsidence coefficient could decrease when the rock-soil ratio increases (excluding the rock-soil ratio is 2:1) in the 250 m depth level. In different depth level, the impact extent of the rock-soil ratio on subsidence coefficient is different. According to the results of numerical simulation, the super thick soil that is more than 80 m could cut down the subsidence coefficient.
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