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为查明地质构造区域煤与瓦斯突出的致灾原因,利用自主研制的煤与瓦斯突出模拟试验装置,研究逆断层和褶曲复合构造带的应力分布,分析应力对复合构造带瓦斯赋存和聚集的影响,从地质角度阐述复合构造带煤与瓦斯突出发生的力学作用机制。试验发现:复合构造带应力分布较为复杂,沿逆断层的断面转折部位在其附近空间应力分布最为集中,构造集中应力可达原岩应力的1.3~1.7倍。复合构造形成的过程中煤体结构遭到严重破坏,构造煤非常发育,应力集中促使瓦斯向裂隙发育区运移和聚集,使其成为高压瓦斯的富集区;构造煤发育和大量承压状态的瓦斯为煤与瓦斯突出的发生提供了必要的条件。
In order to find out the causes of the coal and gas outburst in the geological tectonic zone, the stress distribution of the reverse fault and the fold composite tectonic zone was studied by using self-developed coal and gas outburst simulation test device. The stress was analyzed for the occurrence and accumulation of gas in the composite tectonic zone The mechanism of mechanical action of coal and gas outburst in composite structure zone is described from the geological point of view. It is found that the stress distribution in the composite structural belt is more complicated. The stress distribution around the transitional section along the fault is most concentrated in the vicinity of the fault, and the stress concentration in the structure reaches 1.3 to 1.7 times that of the original rock. During the formation of composite structure, the structure of coal was severely damaged, the tectonic coal was well developed, and the stress concentration promoted the migration and accumulation of gas to the fracture development area, making it an enrichment area for high-pressure gas. The development of tectonic coal and a large number of pressure conditions Of the gas for the coal and gas outburst provides the necessary conditions.