深井回采工作面覆岩运动及煤体应力分布规律

Law governing overburden movement and stress distribution of coal body in deep coal mine

为保证深部开采矿井安全高效生产,根据东海煤矿32#右十一回采工作面地质资料,采用RFPA、ANSYS软件对深部回采工作面覆岩关键层运动规律及煤体内的应力变化情况进行数值模拟。结果表明,开采深度越大工作面覆岩关键层的破断距离越小,顶板周期来压步距越短;该工作面的周期来压步距为30 m左右,数值模拟与现场实测结果吻合;随着回采工作面的推进,高应力区向远离工作面的煤体内部移动,且煤柱上的高应力分布带移动量大于煤体上的移动量。该研究为矿井深部开采超前支护及冲击矿压防治提供了参考。

Aimed at ensuring the safe and high efficiency operation in the deep mine,this paper introduces the use of RFPA and ANSYS software for the numerical simulation of the laws governing the movement of key strata in overlying rock and the stress changes in coal body in deep mining faces,based on the geological data of 32# 11 mining right face in Donghai mines.The results show that a deeper mining results in the smaller breaking distance of key strata in overlying rock and the shorter step of roof pressure cycle.The work face has the periodic step distance of about 30 m,as is shown by the consistence between the numerical simulation and the practical measurement.The advance of mining face results in the movement of the high stress area towards coal body away from work face,with a consequent greater movement in high stress distribution on coal pillar than on coal body.This study provides the reference for the deep mining retain and rock-burst prevention control.