承压水上开采底板突水机理研究

Research on Water Inrush Mechanics of Floor Strata for Mining on Confined Aquifer

根据Hoek-Brown经验准则修正公式,估算出底板不同深度岩体扰动系数D和地质强度指数GSI的值,判断底板的破坏程度。结合孙疃矿1028工作面现场观测资料,对距煤层5 m处底板垂直应力分量进行算例分析,理论计算得出底板的应力分布。为进一步验证算例分析的可行性,运用FLAC3D软件对孙疃矿1028工作面进行数值模拟,在同等条件下,两者底板应力分布相吻合。并模拟不同开挖步距对底板应力及位移的影响,进一步分析研究承压水上开采底板运移破坏机理及突水规律。

Based on Hoek-Brown experience criterion correction formula,it estimated the values of rock disturbance coefficient D and geological strength index GSI in different depth of floor strata,judged floor damage degree.Combined with the field observation data of 1028 working face in Suntuan Coal Mine,it carried out example analysis for floor vertical stress component from 5 m coal seam,and it obtained floor stress distribution by theoretical calculations.In order to further verify the feasibility of the example analysis,it made numerical simulation with FLAC3D software for 1028 working face of Suntuan Coal Mine,both of floor stress distribution results coincided under the same conditions.It simulated the influence of different excavation steps for the floor stress and displacement,and further studied floor migration failure mechanism and law of water inrush of mining on confined aquifer.