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基于薄煤层坚硬顶板下沿空留巷的矿压显现规律,建立了巷旁支护模型:在充填处预设顶板下沉量,充分利用煤壁的承载能力;采用单体支柱与矸石带联合支护充填区域顶板的支护,并采用卸压钻孔辅助切顶,及时切断巷道顶板与采空区顶板的联结,充当巷道支护的保护岩块。利用数值模拟软件FLAC~(3D),分别模拟了3个临时支护方案下的沿空留巷效果,通过比较3个方案下的顶板下沉情况、顶板回转角情况,确定了采用矸石带与单体支柱来联合支护顶板。实践表明,滨湖煤矿16105工作面沿空留巷时,混凝土充填体宽度取2.0 m,高度为1.5 m,留巷效果较好,基本满足下一工作面的生产需要。
Based on the regularity of underground pressure in gob-side entry under hard roof, the roadway support model is established: the amount of roof subsidence is preset at the filling site to make full use of the bearing capacity of the coal wall; Protect the filling of the roof support, and the use of pressure-relief drilling to help cut the roof, timely cut off the top of the roadway roof and the goaf coupling, acting as roadway protection rock protection. By using numerical simulation software FLAC 3D, the effects of gob-side entry retaining under three temporary support schemes were simulated respectively. By comparing the situation of roof sinking and roof rotation under the three schemes, Single prop to jointly support the roof. Practice shows that when the 16105 working face of Binhu coal mine is gob-side entry, the width of concrete filling body is taken as 2.0 m and the height is 1.5 m. The effect of retaining lane is better, basically meeting the production needs of the next working face.