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为了研究工作面在回采过程中的覆岩移动规律,以麦垛山煤矿2#煤典型工作面为例,采用数值模拟的方法,对工作面覆岩破裂、主应力、顶板垂向和横向位移以及地表下沉进行了分析。根据数值模拟结果,顶板塑性破坏区呈现出波浪状,导水裂缝带发育最大高度为74.9 m,煤壁上最大压应力为7.95 MPa,采空区顶板上的最大拉应力为1.18 MPa,2#煤顶板最大下沉值为1 600 mm,地表最大下沉值为875 mm。
In order to study the law of overlying strata movement in the process of mining face, take 2 # coal typical working face in the Maisonshan Coal Mine as an example, numerical simulation method was used to analyze the overlying strata rupture, principal stress, roof vertical and lateral displacement And surface subsidence were analyzed. According to the results of numerical simulation, the plastic failure zone of the roof is wavy, the maximum height of the fracture zone is 74.9 m, the maximum compressive stress on the coal wall is 7.95 MPa, the maximum tensile stress on the roof of the goaf is 1.18 MPa, The maximum roof subsidence value is 1 600 mm and the maximum subsidence value is 875 mm.