羊东矿“三下”压煤地表沉降研究

Study on surface subsidence of'three under'coal of Yangdong Mine

为研究羊东矿井下开采对地表沉降的影响,采用理论分析、数值模拟相结合的方法,对06201工作面开采导致的地表沉降情况进行研究。结果表明,通过2种方法计算地表最大下沉值为1.74 m,最大水平位移值为0.537 m;并通过数值模拟得出,开采过程中覆岩运移和应力云图均沿采空区中部呈对称分布,顶板最大位移量约为2 m;煤壁两侧存在应力集中区,最大应力值达到近34 MPa;采空区中部对应的地表中心位移最大,水平位移最大出现位置在模型长度147 m处。经观测羊东矿地面沉降与水平位移都在预计范围内,有效地对地表沉降进行预测可保证开采的正常进行。

In order to study the influence of underground mining on surface subsidence in Yangdong Mine,the surface subsidence caused by mining in No.06201 Face was studied by means of theoretical analysis and numerical simulation.The results showed that the maximum subsidence value of surface was 1.74 m and the maximum horizontal displacement value was 0.537 m by two methods.Through numerical simulation,it was concluded that the overlying rock migration and stress cloud map were symmetrically distributed along the middle of the goaf during the mining process,and the maximum displacement of the roof was about 2 m.There were stress concentration areas on both sides of the coal wall,and the maximum stress value reached nearly 34 MPa.The surface center displacement corresponding to the middle of the goaf was the largest,and the maximum horizontal displacement occurs at the model length of 147 m.It was observed that the land subsidence and horizontal displacement of Yangdong Mine were within the expected range,and the effective prediction of surface subsidence could ensure the normal mining.