承压水上开采煤层底板破坏深度数值模拟及实测研究

根据某矿综采工作面煤层顶、底板岩层组合及结构性质特点,建立了反映完整底板岩层组合的工程地质模型,通过FLAC3D软件数值模拟分析了煤层开采过程中底板应力及破坏特征,结果表明:煤层底板下0～4 m内岩体破坏较为严重,不具有阻水能力;煤层底板下4～10 m内岩体虽然发生了局部破坏,但其破坏程度相对较弱,具备一定的阻水能力。结合现场煤层底板钻孔内不同深度传感器应变测试值随工作面推进的变化情况,确定出煤层底板破坏深度为8～10 m。综合对比分析得出煤层底板破坏深度为10 m。

Research on Numerical Simulation and Measurement of Damage Depth of Seam Floor under Confined Water Action

In this paper,an engineering geological model which can reflect the combination of the intact floor strata was established according to the roof and floor strata combination and their structural characteristics in a fully-mechanized coal face in some mine,the floor stress and its damage characteristics in the process of coal mining was analyzed by numerical simulation with FLAC3D software,and it came to the conclusion that the seam floor was more seriously damaged in 0 to 4 m range below it and did not have the ability to block water;although the local damage occurred in 4 to 10 m range below the seam floor,its damage extent was relatively weak,and it has a certain ability to block water.8 to 10 m damage depth of the seam floor rock mass was determined according to the variation regularity of the strain value measured by the sensors in the seam floor borehole with the advance of coal face;and through the comprehensive comparison and analysis,it came to the conclusion that the damage depth of the seam floor rock stratum was 10 m.