直接顶厚度对回采巷道稳定性影响的数值模拟研究

当回采巷道沿煤层顶板或底板布置时,由于煤层一般较顶底板软弱,因此,巷道围岩的矿压显现特征主要表现为两帮煤体的变形、破坏等现象,巷道易发生两帮煤体沿层理向巷道空间挤出的现象,并进而产生破碎、松动等现象.这与巷道上覆岩层的应力有着密切的关系.本文运用RFPA软件,分析了回采巷道上覆软弱直接顶厚度对巷道稳定性、巷道围岩应力分布与破坏情况、巷道围岩破裂部位与破裂范围的影响.通过对不同直接顶厚度影响下的巷道围岩稳定性分析,得出直接顶厚度与巷道围岩稳定性之间的数值关系,并分析了直接顶厚度对回采巷道稳定性的影响因素,这为煤矿回采巷道的开挖与支护提供一定的理论基础.

Numerical simulation on stability of gateway thickness of immediate under the influence of roof

Coal seam is weaker than roof and floor,when gateway is laid along the roof or floor,the characteristics of strata behaviors of surrounding rock is mainly appeared these phenomena,such as deformation,destruction,etc.It is easy for the coal on the gateway's sides that extrude to the space of gateway,produce looseness and fragmentation.Those phenomena are interrelated nearly with the stress of roof strata.RFPA is applied to analyze the effect of the thickness of immediate roof on the stability of gateway,stress distributing of surrounding rock,destruct degree,and the destruct location area.By the analysis on the gateway thickness stability of different immediate roof thichness,the mumeric relation between the immediate roof stability and gateway stability is educed,and also analyze the effect of the thickness of immediate roof on the stability of gateway,which offer some academic foundation for the excavation and supporting of gateway.