安徽芦岭煤矿Ⅱ88采区瓦斯地质规律

Gas-geology principle of Ⅱ88 mining area in the Luling coal mine,Anhui,China

根据构造、层序、瓦斯压力、瓦斯含量、瓦斯涌出量等多因素分析了安徽省宿州市芦岭煤矿Ⅱ88采区瓦斯地质规律,并建立了运动学模型和压力梯度计算模型。芦岭煤矿区域构造上由于徐宿弧形构造和双重构造2方面因素,造成其相对于临宿矿区其他矿井的构造应力更集中,瓦斯压力较大、含量较高,突出灾害危险性严重。层序上,芦岭矿井第8煤层发育在最大海泛面时期,为层序内最厚的稳定煤层,顶底板圈闭性良好,瓦斯富集。Ⅱ88采区以采区中部的F14正断层为界划分为东、西2个瓦斯地质单元,分别具有不同的瓦斯压力梯度。东部瓦斯地质单元是F14断层下盘,海拔高度较高但瓦斯压力高,而西部单元(断层上盘)海拔高度较低但瓦斯压力低,与正常瓦斯地质规律相反,初步分析与正断层F14上盘煤层顶板在拉张运动过程中被破坏有关。

According to structure geology, sequence stratigraphy, gas pressure, gas content, gas emission and other factors, this paper analyzes the gas-geology principle inⅡ 88 mining area in the Luling coal mine of Suzhou in Anhui, and establishes the kinematic model and the pressure gradient calculation model. The Luling coal mine is controlled by the Xusu arc structure and duplex thrust that make the stress more concentrated, the gas pressure and gas content bigger, and the outburst disaster risk more serious than other mines in the Sulin mine area. In sequence, the 8th coal seam is the thickest stable coal seam developed near the maximum flooding surface, so the trap effectiveness of its roof and floor is good and the coal gas is accumulated. Faults superposition regions are prone to coal and gas outburst. Ⅱ 88 mining area is divided into the east and west gas geological units which have a different gas pressure gradient, respectively. The gas pressure in the east gas geology unit of higher elevation is the bigger, because the coal roofs of the hanging wall were damaged during the stretch of F14 normal fault. The research achievement is not only of essential guiding significance to the safety production of Ⅱ 88 mining area, but also provides a reference for the study on the coal gas geology principle of other mines.