双系煤层开采覆岩运移及采空区煤自燃危险区域研究
Research on overlying strata movement and dangerous area of coal spontaneous combustion in goaf in dual-system coal seam mining
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摘要: 针对大同矿区永定庄矿8106综采工作面采空区大量漏风的工程问题，采用数值模拟方法研究了双系煤层重叠采动岩层的运动破断形式和裂隙动态演化规律，分析了双系煤层多层采空区连通机制以及采空区煤自燃危险区域分布规律。结果表明：侏罗系煤层群采空区表现为顶板垮落、底板底鼓及煤柱附近底板剪断式破坏；石炭系3-5#煤层回采依次造成基本顶、下部关键层和上部关键层破断和垮落，上部关键层破断下沉后双系采空区发生连通并导致漏风，下部关键层破断周期为60 m；在上、下关键层之间形成的裂隙区横截面上，主要漏风通道分为动态裂隙和边缘裂隙；有外部漏风时采空区煤自燃危险区域主要分布在距工作面100～175 m之间，无外部漏风时，煤自燃危险区域相对面积减少且总体位置朝工作面方向前移约30 m。Abstract: Aiming at the engineering problem of large air leakage in the goaf of 8106 fully mechanized mining face of Yongdingzhuang Mine in Datong Mining Area, numerical simulation method is used to study the movement breaking form and the dynamic evolution of cracks and the expansion range of the double-system coal seam under multiple mining. The goaf connection mechanism reveals the distribution law of the coal spontaneous combustion danger area in the goaf. The results show that the goaf of Jurassic coal seam group is manifested as roof fall, large floor heave and shear failure of the floor near the coal pillar; the mining of Carboniferous 3-5# coal seam will successively cause the breakage and caving of the basic roof, the lower key layer and the upper key layer. After the upper key layer breaks and subsides, the double-system goaf will be connected and lead to air leakage. The breakage period of the lower key layer is 60 m. In the cross section of the crack zone formed between the key layers, the main air leakage channels are divided into dynamic cracks and edge cracks; when there is external air leakage, the coal spontaneous combustion danger area in the goaf is mainly distributed between 100-175 m from the working face, and when there is no external air leakage, the relative area of the coal spontaneous combustion danger zone is greatly reduced and the overall position is moved forward about 30 m in the direction of the working face.
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