复合构造带力学特征及其对瓦斯突出的作用机制

Mechanical characteristics of complex geological structure zone and its effect on gas outburst

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 deeply understand the disasters of coal and gas outburst occurring in the geological structure area,a self-developed simulation experimental device of coal and gas outburst was used to research the stress distribution throughout the complex geological structure zone,the influence of the stress on the gas occurrence and accumulation in the geological structural belt was analyzed,and the mechanical mechanism of the coal and gas outburst in the complex geological structure zone was explained from the view of geology.The results show that the distribution of stress throughout the complex structure zone is complicated,that the concentration positions of the stress are mainly distributed over the area around the turning point along the fracture surface of the reverse fault,and the concentrated stress can reach 1.3 to1.7 times of the primary rock stress,that in the process of complex structure forming,the coal body structure is seriously damaged and the tectonic coal develops very well,that the stress would facilitate the gas migration to and accumulation in the seam area,making it a enrichment region of high pressure gas,and that both the development of tectonic coal and much gas under the artesian condition create a necessary condition for the coal and gas outburst.