残留空区下残煤复采工作面稳定性研究

Stability Study on the Residual Coal Repeated Mining Face Under Residual Mined-out Area

通过数值模拟对厚煤层上分层巷柱开采区残留"空区"稳定性对复采工作面的影响进行了研究,研究结果表明,工作面通过宽度较大残留采空区时,其顶板垂直应力表现出"弱-强-弱-强-弱"的规律,且出采空区前应力峰值较进采空区后的峰值大;残留采空区底板岩性不同对下方复采工作面顶板压力分布规律影响不大。

The effect of the stability of thick coal seam upper slice pillar residual ＂ mined out area ＂ on residual coal repeated mining face was studied with numerical simulation. Some conclusions can be drawn as follows. When mining face passed through wider resi- dues goaf, its roof vertical stress presented the law of ＂weak - strong - weak - strong - weak＂, and the stress peak before goaf was larger than the stress behind the goaf; the different lithologies of residues goaf floor has less influence on pressure distribution law of repeated mining face roof.