Numerical Simulation Study on Coal Pillar Setting at Fault Sun in Longdong Coal Mine
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摘要: 为了研究断层带对煤层开采的影响，以龙东煤矿东二采区F孙断层岩体地层为原型，根据采区地质特征，运用FLAC3D建立数值模型，模拟煤层开挖。根据数值模拟结果，判断不同断层煤柱条件下采空区塑性变化及煤层顶板应力变化情况，从而合理设置断层煤柱。研究结果表明：随着采煤工作面的不断推进，采空区顶底板破坏越来越严重，当工作面推进95 m时，采空区顶底板破坏严重且与断层邻近的地层受到破坏，从而导致断层破坏，成为导水断层，引发煤层突水事故。同时，对煤层推进95 m时，煤层顶板的应力特征进行分析，得出断层煤柱合理留设宽度为55 m。Abstract: In order to study the influence of fault band on coal seam mining,taking the fault Sun stratigraphy of the East Second Mining Area of Longdong Coal Mine as the prototype,we simulated coal seam excavation according to the geological characteristics of mining area by using numerical model which was established on the basis of FLAC3D.According to the numerical simulation result,we judged the plastic property deformation of the goaf and the stress variation in the roof of the coal seam under different fault coal pillars.Only in this way can the fault coal pillar be set reasonably.The research showed that the damage of the roof and floor of the goaf was becoming more and more serious with the working face of coal mining push forward.When the coal seam mining 95 m,the roof and floor of the goaf was seriously damaged and the formation adjacent to the fault was being destroyed,leading the damaged faults to become geological faults,and causing the occurrence of coal seam water inrush events.Meanwhile,the stress characteristics of the coal seam roof were analyzed when the coal seam mining 95 m,and came to the conclusion that the width of the fault pillars should be rationally set as 55 m.
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