复合煤层开采覆岩裂隙带发育特征  

Overburden fracture zone development characteristics of composite coal seam mining

作　　者：鲍银辉 BAO Yinhui(Shaanxi Huangling No.2 Coal Mine Co.,Ltd.,Yan’an 727307,China)

机构地区：[1]陕西黄陵二号煤矿有限公司,陕西延安727307

出　　处：《陕西煤炭》2024年第3期74-78,共5页Shaanxi Coal

摘　　要：复合煤层开采过程中的重复扰动作用易诱发顶板剧烈变形、矿压显现异常等问题。为探明黄陵二号煤矿复合煤层开采状态下的覆岩裂隙带发育特征,运用3DEC数值模拟软件建立全尺度的数值模型。对复合煤层开采状态下的覆岩运移图与裂隙场发育图进行分析,并对下组煤开采前的覆岩裂隙特征进行钻孔实测分析。结果表明,上组煤层开采扰动造成地层中存在大量劈状裂隙与垂直裂隙,造成赋水空间增大,部分裂隙被地层中泥岩类物质充填。下组煤开采使垮落带增大37%~56%,导水裂隙带增大了约42%~46%。同时,复合开采所形成导水裂隙带高度明显大于单煤层开采裂高,总体增大9%~15%。The repetitive disturbance effect during the mining process of composite coal seam is likely to induce problems such as violent deformation of the roof and abnormal mineral pressure manifestation.In order to investigate the development characteristics of overburden fracture zone under the mining state of composite coal seam in Huangling No.2 Coal Mine,a full-scale numerical model is established using 3DEC numerical simulation software.The overburden transport map and fracture field development map under the mining state of composite coal seam are analyzed,and the overburden fracture characteristics before mining of lower group coal are analyzed by drilling.The results show that:the mining disturbance of upper group coal seam causes a large number of split fractures and vertical fractures in the stratum,leading to the increase of water-contributing space,and some fractures are filled by mudstone in the stratum.The lower group coal mining increases the collapse zone by 37%~56%and the water-conducting fracture zone by about 42%~46%.At the same time,the height of the water-conducting fracture zone formed by composite mining is significantly higher than that of single-seam mining,with an overall increase of 9%~15%.

关 键 词：复合煤层 数值模拟 钻孔实测 覆岩裂隙带 

分 类 号：TD323[矿业工程—矿井建设]