采空区覆岩及地表变形规律相似模拟研究

Similarity Simulation of Deformation and Failure Law of Overburden of Goaf and Ground

以河东煤田北部某矿8~#煤层为研究对象,利用相似模拟的方法对采空区覆岩破坏规律和采动引起的地表沉降变形规律进行了研究。研究结果表明:随着开挖的不断进行,采空区覆岩呈周期性的离层-断裂-垮落破坏特征;随着推进距离的增大,垮落长度和高度在不断增大;开采结束后,采空区上覆岩层变形不断趋于稳定,离层不断被压实。

No.8 coal seam of a coal mine in the northern part of Hedong coal field is taken as the research object, the similarity simulation method is used to analyse the destruction law of goaf overburden and the variation law of ground deformation caused by mining. The results show that： with the continuous excavation, the overlying strata of the goaf are cyclical stratum-fracture-collapse failure chareristics; the collapse length and height are increasing with the increase of the propulsion distance; after the mining is over, the overburden deformation of the goaf is constantly stabilized,the layers are constantly being compacted.