下保护层开采围岩运移数值模拟研究

Study on Numerical Simulation of Surrounding Rock Movement in Lower Protective Seam Mining

采用UDEC和FLAC 3D数值模拟软件分别模拟鹤壁四矿下保护层开采后上覆岩层"三带"的高度、被保护层的膨胀变形和卸压情况,为下保护层工作面的长度、采高、工作面支护参数等提供参考。模拟结果表明:层间关键层结构对被保护层的卸压和膨胀变形有一定影响。距离一8煤层4 m的4.6 m厚的石灰岩关键层结构不会对上覆煤岩层的卸压和膨胀变形有影响或者影响较小,但距离一8煤层约37 m的4.6 m厚的砂质泥岩关键层结构对上覆煤岩层的卸压和膨胀变形有一定影响。

UDEC and FLAC 3D numerical simulation software were used to simulate the pressure relief in Hebi4 Mine where the protective layer was to be mined and the height of the three belts of the overlying strata,the expansion deformation in protected layer was to occur respectively,the practice provided reference for the layout of the lower protective layer mining in mining height,length and support parameters. The simulation results show that the layer structure between key layers has a certain effect on the pressure relief and expansion deformation of the protected layer. The 4. 6 m thick limestone key layer structure with a vertical distance of 4 m from 一 8 coal seam did not have or only have slight impact on the deformation and pressure relief of the overlying coal and rock layer,but the 4. 6 m thick sandy mudstone with a vertical distance of about 37 m from the 一 8 coal seam had.