基于数值模拟的充填开采地表下沉系数分析

充填开采是解放“三下”压煤的重要手段。为了研究充填体强度对充填开采时下沉系数的影响，本文以本溪彩屯矿的充填开采实践为基础，结合工程实际建立了FLAC3D数值模型并对充填开采地表下沉系数进行了模拟分析，得到了不同强度充填时对应的地表下沉特征和充填开采时充填体强度与地表下沉系数之间的一般关系。通过改变充填体弹性模量得到了相应的等效采厚比和地表下沉系数，通过多项式拟合建立了等效采厚比和地表下沉系数两者之间的函数关系，并给出了相关参数的参考值，为预测充填开采的地表下沉系数提供了依据。

Numerical simulation analysis of surface subsidence coefficient of filling mining

Filling mining was an important means to liberate the ＂three under＂ coal, In order to study the impact ofthe strength of filling body to the subsidence coefficient offillingmining, this study based on the filling miningpractice of BenXi Cai Tung mine, the numerical model based on FLAC3D was established combined with practicalengineering, And the surface subsidence coefficient of the filling mining was carried out based on simulation analysis,characteristics of surface subsidence coefficient corresponding to different filling intensity was gotten, thecorresponding equivalent mining thickness ratio and the coefficient of surface subsidence were obtained by changingthe filling body elastic modulus and general relation between the strength of filling body and the coefficient of surfacesubsidence was obtained Equivalent mining thickness ratio by polynomial fitting and the function relation between thesurface subsidence coefficient and equivalent mining thickness ratio were established. The related parameters forreference was given, a certain reference for predicting the surface subsidence coefficient in filling mining wasprovided.