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为了探究采宽、采厚、上覆岩性和采深等4个主要因素对覆岩移动变形所起到的贡献大小,确定较敏感或最敏感因素,给煤矿开采设计和地表建筑物保护提供参考依据,本文以兖州某矿主采近水平煤层为背景,在正交试验优化组合基础上借助FLAC3D数值模拟软件对覆岩移动的影响因素(采厚、采深、采宽及上覆岩性)进行了敏感性分析。研究结果表明,不同影响因素对覆岩移动的敏感性具有较大的差异性,16种不同组合条件下对采动覆岩最大竖直位移和最大水平位移的敏感性作用由大到小依次为:采宽、采厚、上覆岩性、采深。最后,利用多元线性回归分析法建立了多因素作用下覆岩移动的数学公式,回归效果非常显著。
In order to explore the contribution of the four major factors such as mining width, mining thickness, overlying lithology and mining depth to the overlying strata movement and deformation, determine the most sensitive or sensitive factors, and provide the coal mining design and surface building protection According to the reference, taking the near horizontal coal seam of a mine in Yanzhou as a background, based on the orthogonal experiment, the influencing factors (mining thickness, mining depth, mining width and overlying lithology) of overlying strata are simulated by FLAC3D numerical simulation software. ) Conducted a sensitivity analysis. The results show that the sensitivity of overlying strata varies greatly with the different influencing factors. The sensitivity of maximal vertical displacement and maximal horizontal displacement of overburden strata from 16 different combinations is : Mining width, mining thickness, overlying lithology, mining depth. Finally, using multivariate linear regression analysis to establish the mathematical formula of overlying strata movement under multi-factors, the regression effect is very significant.