厚煤层小煤柱巷道采掘交锋应力变化规律研究

Research on Change Rule of Roadway Tunneling and Mining Stress in Thick Coal Seam Small Pillar

以晋华宫矿12-3#层5107巷为研究对象,利用FLAC3D软件模拟研究了厚煤层在留设小煤柱时采掘交锋过程中围岩的应力变化规律。结果表明:采掘交锋前,第一应力在顶底角形成了小范围的应力集中,最大值为12 MPa,第二应力由巷道表面向深部逐渐增加,在煤帮深处达到最大;采掘交锋后,巷道浅部围岩第一主应力增量波动较大,巷道顶板上部及靠煤柱侧的顶角,第一应力均有不同程度的增加,最大增量达到4.78 MPa,而第二应力基本没增加,反而有不同程度的降低。

Takes No. 12-3layer of 5107 roadway in Jinhuagong coal mine as research object,utilizes FLAC3D software simulation researches the stress change rule of surrounding rock in the process of tunneling and mining when small coal pillar is establishes in thick coal seam,the result shows that before tunneling and mining,the major principal stress forms small range of stress concentration in the corner of roof and floor,the maximum is 12 MPa,the third principal stress gradually increases from roadway surface to the deep,reaches maximum in the depths of coal side. After tunneling and mining,the major principal stress increment of roadway shallow surrounding rock have a larger fluctuation,the major principal stress of roadway roof upside and top corner on the side of coal pillar have different degrees of augment,the biggest increment reaches 4. 78 MPa,but the third principal stress almost have no increase,on the contrary have different degrees of decrease.