31203工作面动载矿压削弱机理研究
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摘要
综采工作面房采区存在集中煤柱,在房采区下工作面进行开采,通过上覆煤柱时,下工作面会产生动载矿压。以石圪台矿31203工作面为基础,采用理论分析、数值模拟手段对削弱此种动载矿压机理进行了研究,得到上覆集中煤柱超前失稳使得传递至下煤层老顶岩梁的载荷大幅减小,削弱了动载压力的影响。
There are concentrated coal pillars in fully-mechanized coal mining face of room and pillar mining, the main roof beam of coal seam will form a rock blocks with hinge structure at the boundary of coal pillar, when the coal mining face passing through overburden concentrated coal pillar, this structure will generate the rotary motion, resulting in the dynamic mine pressure. The advance instability of concentrated coal pillar can make the bottom rock beam above the coal pillar supported by the gangue, the main roof beam is supported by a lower support force, which makes the load of the main roof beam of the lower coal seam greatly reduced and the effect of dynamic mine pressure is weakened. On the engineering background of face 31203 of Shigetai coal mine,the mechanism of this type of dynamic mine pressure to weaken has been investigated through theoretical analysis and numerical simulations.
There are concentrated coal pillars in fully-mechanized coal mining face of room and pillar mining, the main roof beam of coal seam will form a rock blocks with hinge structure at the boundary of coal pillar, when the coal mining face passing through overburden concentrated coal pillar, this structure will generate the rotary motion, resulting in the dynamic mine pressure. The advance instability of concentrated coal pillar can make the bottom rock beam above the coal pillar supported by the gangue, the main roof beam is supported by a lower support force, which makes the load of the main roof beam of the lower coal seam greatly reduced and the effect of dynamic mine pressure is weakened. On the engineering background of face 31203 of Shigetai coal mine,the mechanism of this type of dynamic mine pressure to weaken has been investigated through theoretical analysis and numerical simulations.
引文
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[2]许家林,朱卫兵,王晓振,等.沟谷地形对浅埋煤层开采矿压显现的影响机理[J].煤炭学报,2012,37(2):179-185.
[3]鞠金峰,许家林.倾向煤柱边界超前失稳对工作面出煤柱动载矿压的影响[J].煤炭学报,2012,37(7):1 080-1 087.
[4]王方田.浅埋房式采空区下近距离煤层长壁开采覆岩运动规律及控制[D].徐州:中国矿业大学,2012.
[5]鞠金峰,许家林,朱卫兵,等.神东矿区近距离煤层出一侧采空煤柱压架机制[J].岩石力学与工程学报,2013,32(7):1 321-1 330.
[6]屠世浩,窦凤金,万志军,等.浅埋房柱式采空区下近距离煤层综采顶板控制技术[J].煤炭学报,2011,36(3):366-370.
[7]徐金海,缪协兴,张晓春.煤柱稳定性的时间相关性分析[J].煤炭学报,2005(4):433-437.