摘要
为了研究煤与瓦斯突出过程中煤体瓦斯的作用,采用煤体中瓦斯总量守恒的原理研究瓦斯含量与瓦斯积聚内能的基本方程和影响因素;分析煤与瓦斯突出产生的力学条件和机理,建立了煤与瓦斯突出危险程度的矩阵图。结果表明:瓦斯含量是煤体瓦斯内能最直接的反应,其值大小决定瓦斯内能的大小;瓦斯压力梯度、煤体的断裂韧性及煤体内的裂隙发育程度决定着瓦斯突出的危险性,低渗透性构造煤对瓦斯运移阻力较大,容易形成较大的瓦斯压力梯度,从而更容易发生煤与瓦斯突出。煤层中的瓦斯含量、瓦斯压力、地应力越大,煤体的强度、渗透率越小,越容易发生突出。煤层瓦斯情况、力学性能、地质构造和煤层的应力状态是决定煤与瓦斯突出的主要因素。
In order to study the effect of gas in the process of coal and gas outbursts,this paper studies the basic equation of gas content and gas internal energy and controlling factors according to the conservation of the quantity of gas.The mechanical conditions and the mechanisms for the coal and gas outburst are analyzed.Outburst risk matrix is built.Results show that the porosity of coal is determined by the pore size of coal itself,and gas content of coal seam is the most direct representative of internal energy that is dependent on the gas content.The risk of coal and gas outburst is determined by gas pressure gradient,the fracture toughness of coal and development degree of cracks in coal seam.Low-permeability prevents the gas from transporting,causing larger gas pressure gradient and increasing the risk of outburst.An outburst is more likely to happen in the following conditions： higher gas content and pressure,higher stress in coal seam,smaller coal strength and lower permeability.The main factors of coal and gas outburst are gas,intense stress,geological structures and coal strength.
出处
《中国安全科学学报》
CAS
CSCD
北大核心
2010年第9期116-120,共5页
China Safety Science Journal
基金
长江学者和创新团队发展计划资助(IRT0843)
山东省科技发展计划项目(2010GSF10808)
关键词
煤与瓦斯突出
渗透率
瓦斯内能
瓦斯含量
瓦斯压力梯度
coal and gas outburst
penetrability
gas internal energy
gas content
pressure gradient
