侏罗系煤综放开采导水断裂带高度预计研究
Study on Height Prediction of Water Flowing Fractured Zone Caused by Full-mechanized Caving Mining in Jurassic Coalfield
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摘要: 为了研究侏罗系煤开采导水断裂带高度，首先基于区域侏罗系煤层开采导水断裂带高度实测数据，分析认为其与现行规范经验公式计算结果存在较大差异；采用多元回归分析，建立了适用于研究区导水断裂带高度预测的多元非线性公式。然后考虑大规模煤层开采顶板工程地质参数动态变化特征，选用ＲＦＰＡ软件，以金鸡滩煤矿为例，模拟分析了侏罗系煤层大采高综放开采顶板变形破坏动态过程及裂隙发育高度。结果表明：多元非线性公式预计误差较其他公式小，采用多元非线性公式预计金鸡滩矿综放工作面导水断裂带高度为176．68 ｍ，数值模拟结果为174．80 ｍ，二者较为相符。Abstract: In order to study the height of water flowing fractured zone of Jurassic coal mining, firstly, based on the measured data of height of water flowing fractured zone under regional Jurassic coal seam mining, we found that there were greater differences with the calculation of the empirical formula in current specification. A non-linear formula which can be apply to predict the height of water flowing fractured zone in the study area was established by multifactorial regression analysis. Then, taking Jinjitan Coal Mine as the study area, the fissure developing height and dynamic process of roof deformation and destruction of fully mechanized caving mining in Jurassic coal seam was simulated and analyzed using RFPA software, which took engineering geological parameters dynamic variation of coal seam roof under the large-scale mining into consideration. Research shows that the prediction error of multivariate nonlinear formulas is smaller than that of other formulas; using multivariate nonlinear formulas and numerical simulation, the predicted height of water flowing fractured zone of the full-mechanized top-coal caving mining face in Jinjitan Coal Mine is 176.68 m and 174.80 m respectively, they are basically consistent.
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