兴隆庄煤矿煤层底板破坏特征研究

Study on the Failure Characteristics of Coal Seam Floor in Xinglongzhuang Coal Mine

以兴隆庄煤矿10302综放工作面开采实际为背景,采用数值模拟和现场超声成像测试相互验证的方法,对采动条件下煤层底板破坏特征进行综合对比研究。数值模拟研究表明,工作面垂直应力呈"马鞍形"分布,剪应力大致呈"蝶状"分布;现场超声成像探测表明,10302综放工作面煤层底板下16 m范围内裂隙发育较为明显,但16 m以后裂隙发育相对较少;综合分析得出该面采动底板变形破坏深度为16 m,研究结果为兴隆庄煤矿煤炭资源安全开采及矿井水害防治提供参考依据。

Taking the condition of fully - mechanized working face in Xinglongzhuang coal mine as background, using mutual authenti- cation method of numerical simulation and live ultrasound imaging test, a comprehensive comparative study on the failure characteristics of coal seem floor under the mining is made. The numerical simulation indicats that the vertical stress is ＂saddle - shaped＂ distribution and the shear stress is roughly ＂butterfly - shaped＂ distribution in the workface. Field measurement studies show that the fracture de- velopment is obvious within the 16 m range under the seam floor of 10302 mechanized caving face, but the fracture development is rela- tively less exceed the range of 16 m. The depth of defoimation failure of coal seam floor is 16 m by the comprehensive analysis, and the results provide a reference for safety mining and mine water disaster control of Xinglongzhuang coal mine under the same condition.