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为认清鸡西煤田瓦斯赋存规律,根除导致煤矿瓦斯突出灾害频发的根本原因,运用瓦斯赋存地质构造逐级控制理论,在研究鸡西煤田构造演化的基础上,结合鸡西煤田瓦斯地质图编制资料,分析了煤田地质构造、构造煤形成过程和岩浆作用及其对瓦斯赋存的影响,并结合典型矿井探讨了现代应力场对瓦斯突出危险的控制作用。结果表明,鸡西舷地地质构造复杂,主要表现为规模不等的褶皱、断裂。盆地东南缘受控于敦密断裂,盆地中部的基底突出向东倾伏,发育了平-麻逆冲断裂及一个向东倾伏的基底隆起(恒山隆起),使煤田从东至西成斜卧的“人”字形展部,划分煤田为南北两含煤带,岩浆岩作用的程度控制着煤层的煤化程度,也控制着煤层瓦斯赋存;近EW向、NE向、NNE向构造,尤其是NNE向构造受到强烈挤压、压扭作用,致使煤层受到强烈挤压剪切破坏而发育构造煤,有利于瓦斯赋存;现代构造应力场主应力为NEE向,NNW-NW向构造表现为挤压和压扭作用,成为动力灾害多发地带;NE、NNE向构造的拉张有利于瓦斯释放,动力灾害程度相对较低;NNW-NW向和NE、NNE向复合部位应力集中,动力灾害更容易发生。
In order to understand the regularity of gas occurrence in Jixi coal field and eliminate the root causes of frequent coal mine gas outburst disasters, and by applying the gradual control theory of gas-bearing geological structure, based on the study of the tectonic evolution of Jixi coal field and the gas geological map of Jixi coal field This paper analyzes the geological structure of coalfield, the forming process of tectonic coal and magmatic effect and its influence on gas occurrence. Combining with the typical mine, the controlling role of modern stress field on gas outburst danger is analyzed. The results show that there is a complex geological structure on the side of the piedmont, mainly showing folds and faults with different scales. The southeastern margin of the basin is under the control of the Dunmiao fault. The basement of the central part of the basin protrudes eastward, developing flat-hemp thrusts and a basement uplift (Hengshan uplift) tilted to the east, so that the coal field is inclined from east to west The degree of the magmatic rock controls the degree of coalification of the coal seam and also controls the gas occurrence in the coal seam; the structures near the EW, NE and NNE directions, In particular, the NNE tectonic structure is strongly crushed and crushed, causing the coal seam to be strongly crushed and sheared so as to develop tectonic coal, which is favorable for gas occurrence. The principal stress of the modern tectonic stress field is NEE direction and NNW-NW direction Which is the result of compressive and compressive twisting. It is a dynamic disaster zone. The extension of NE and NNE tectonics is favorable to gas release, and the degree of dynamic disasters is relatively low. The stress concentration of NNW-NW and NE, NNE composite parts, Easier to happen.