深部矿井采场上覆岩层内结构形变特征分析

Analysis on Structure Deformation Features of Strata Above Coal Mining Face in Deep Mine

为了获得深部采场采动过程中上覆岩体结构形变动态响应规律,通过分析某采场覆岩体结构类型特征,应用三维半解析数值计算、相似材料模拟、地球物理探测相结合的方法进行了分析研究。结果表明:随着工作面推采,深井上覆岩层分岩组交替出现弯曲—离层—闭合,覆岩形变明显具有分带分区特征,具有集中迟缓现象,且地层沉陷运动随工作面推采呈周期性变化。深部岩体物理力学特性及破断规律与浅部开采不同,是导致上覆岩体结构形变特征产生较大变化的原因。

In order to have the structure deformation dynamic response law of the overburden strata during the mining process of the coal mining face in the deep section of the mine, with the analysis on the structure type features of the overburden strata in a mine, the 3D semi analytic numerical calculation, similar material simulation method and the geophysical exploration combined method were applied to the analysis and study. The results showed that with the coal mining face advancing forward, the sub - rock group of the overburden strata in the deep mine would alternatively have bending, parting and closing. The deformation of the overburden would have the zones and blocks features obviously and would have the concentrated and slow phenomenon. The ground subsidence movement would have the periodical variation with the coal mining face advancing forward. The physical mechanics features and the broken law of the rock mass in the deep mine would be different to the mining in the shallow mine obviously and would be the cause to make the structure features of the overburden strata with large variation.