煤层瓦斯压力的采动应力响应特征研究

Research on Mining Stress Response Characteristics of Gas Pressure in Coal Seam

瓦斯压力是诱发煤与瓦斯突出动力灾害事故的主要因素之一。为获得煤层瓦斯压力的采动应力响应特征,采用数值模拟和综合分析的方法对瓦斯压力的采动应力响应规律进行了研究。结果表明:瓦斯压力具有采动应力响应效应,在煤层开采过程中,应力和瓦斯压力均出现局部升高和降低的现象,均经历了先增大后减小并随煤层的开采不断向前规律性移动的动态演化过程,瓦斯压力受控于应力的演化。构建了动力灾害多因素耦合定性分析判据,分析了动力灾害的类型,可分为应力主导型的动力灾害和应力-瓦斯共同作用主导型的动力灾害。

Gas pressure is one of the main factors liable to the coal and gas outburst and dynamic disasters. In or- der to obtain the mining stress response characteristics of gas pressure in coal seam, the paper researched the mining stress response laws of gas pressure by using the methods of numerical simulation and comprehensive anal- ysis. The results show that gas pressure has mining stress response effect. There were partially raising and lower- ing of the phenomenon between stress and gas pressure in the process of mining, and the stress and gas pressure experienced a dynamic evolution, which first increased and then decreased and continued to move forward regu- larity with mining. The gas pressure was controlled by the evolution of the stress. Qualitative analysis of criterion of dynamic disasters multivariate factors coupling was built, and the types of dynamic disasters were analyzed, and it could be divided into stress - oriented dynamic disasters and stress - gas joint action - oriented dynamic disasters.