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为保证大采高坚硬顶板综采工作面的安全生产,以新疆焦煤集团2310矿为例,通过理论公式计算了老顶悬露长度约为60 m,利用FLAC3D数值模拟软件对25221大采高工作面推进过程中沿走向和倾向顶板的塑性区分布进行了研究,结果表明:在80 m范围内,切眼和煤壁及采空区四周煤体塑性区分布随推进距离的增大而增大,而坚硬顶板塑性区分布范围变化不大,顶板承载能力强;最后采用超前预爆破的方法对坚硬顶板强制放顶,取得不错的效果,排除了坚硬顶板大面积垮落对工作面安全生产造成的损害,也为其他类似矿井提供了借鉴.
In order to ensure the safe production of fully mechanized mining face with big mining height and high roof, taking 2310 mine of Coking Coal Group in Xinjiang as an example, the length of the suspended roof of the old roof was calculated to be 60 m by using the theoretical formula. The FLAC3D numerical simulation software The results show that within 80m, the distribution of plastic zone around the coal cut and the coal wall and goaf increases with the increase of the propulsion distance , While the change of the distribution range of the plastic zone of the hard roof has little change and the bearing capacity of the roof is strong. Finally, the method of advanced pre-blasting is used to force the hard roof to be roofed and the good effect is ruled out, Of the damage, but also for other similar mine provided a reference.