淮南煤田逆冲推覆构造对煤与瓦斯突出的影响分析

为了提高淮南煤田在地质构造带条件下煤与瓦斯突出防治的针对性，采用理论分析的方法研究了淮南煤田逆冲推覆构造和煤与瓦斯突出的关系，对淮南煤田逆冲推覆构造的几何学、动力学特征，以及该构造控制下的煤体结构、瓦斯赋存、构造应力分别进行了分析。研究结果表明，淮南煤田的逆冲推覆构造主要分布在煤田南北两缘，由华北克拉通与扬子克拉通于印支—燕山期相互碰撞挤压形成。煤田南缘逆冲推覆构造由南向北推覆，北缘逆冲推覆构造由北向南推覆，形成了反向相背倾斜的构造系统。淮南煤田逆冲推覆构造带内构造煤发育、瓦斯含量高为煤与瓦斯突出提供了物质基础条件，而较高的构造应力及瓦斯压力为煤与瓦斯突出提供了动力条件。从逆冲推覆构造对煤与瓦斯突出影响的角度分析了望峰岗矿“1.5”煤与瓦斯突出事故原因，分析表明：发生事故的 C₁₃煤层内构造煤发育，瓦斯含量高，构造应力集中，当主井施工揭开 C₁₃煤层时，原应力平衡状态被打破，煤与瓦斯大量喷出，导致事故发生。

Analysis on the influence of thrust nappe structure on coal and gas outburst in Huainan Coalfield

In order to improve the prevention and control of coal and gas outburst under the condition of geological structure belt in Huainan Coalfield,the relationship between thrust nappe structure and coal and gas outburst was studied by means of theoretical analysis,the geometric and dynamic characteristics of thrust nappe structure,as well as the coal structure,gas occurrence and tectonic stress under the control of the structure were analyzed respectively in Huainan Coalfield.The results show that the thrust nappe structures in Huainan Coalfield are mainly distributed in the north and south margins of the coalfield,it is formed by the North China Craton and the Yangtze Craton in the Indosinian-Yanshan period under the collisional compression.The thrust nappe structure is napped from south to north,and the thrust nappe structure of the northern margin is napped from north to south,forming a tectonic system with reverse phase back inclination.The development of tectonic coal and high gas content in thrust nappe structure in Huainan Coalfield provide material conditions for coal and gas outburst.The high tectonic stress and gas pressure provide the dynamic conditions for coal and gas outburst.From the perspective of impact of thrust nappe structure on coal and gas outburst,this paper analyzes the causes of"1.5"coal and gas outburst accident in Wangfenggang Coal Mine,the analysis shows that in the C13 coal seam where the accident occurred,the tectonic coal is developed,the gas content is large and the tectonic stress is concentrated,when the C13 coal seam is uncovered in the main well construction,the original stress equilibrium state is broken,and a large amount of coal and gas gush out,leading to the accident.