金竹山矿区地质构造特征及其对瓦斯分布的控制作用
Geological Structural Features of Jinzhushan Coalfield and Its Effect on Methane Distribution
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摘要: 从金竹山矿区地质构造特征出发,对其断裂和褶皱构造特征进行研究,发现矿区构造较为复杂,矿区范围内次一级褶曲较少,主要分布于西北翼,断层较发育,主要发育于井田边界及两翼浅部,以逆断层为主,正断层次之。通过分析矿区内各构造的活动强度,建立构造运动生热的数学模型对断裂摩擦热能释放量进行模拟,通过估算对比金竹山矿区西北翼和东南翼煤层断面活动的生热量,发现西北翼煤层断层面总生热量较高,东南翼仅八十亭断层规模较大,为5.04×1011 J,而且东南翼逆断层多与附近的正断层沟通,造成应力释放,使得早期生成的瓦斯得到有效的逸散,整个东南翼断层附近的煤与瓦斯突出的为危险级别要小于西北翼。Abstract: Based on the geological structure characteristics of Jinzhushan Coalfield, the characteristics of fracture and fold structure are studied. It is found that the structure is more complicated, and the subgrade fold is less, mostly in the northwest wing of the coalfield. The fault is developed mainly in the boundary of the coalfield and the shallow side of the two wings; the inverse fault is main, and the normal fault is less. By analyzing each tectonic activity in the coalfield, through establishing the mathematical model of fracture tectonic movement heat, and simulating the friction heat release quantity by estimating and comparing the heat in northwest wing mining area and the southeast wing of coal seam section activities, we find that the heat in northwest wing fault plane is higher, and the fault scale of 5.04 ×1011 J of Bashiting fault in the southeast is larger. The inverse fault of the southeast wing is connected with the normal faults, resulting in the release of stress, so that the early gas generation is effectively dissipated. The risk level of coal and gas outburst in the southeast wing near the fault should be smaller than that in the northwest wing.
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Keywords:
- Jinzhushan coalfield /
- structural characteristics /
- fault /
- coal and gas outburst /
- tectonic thermal
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