1.Coal Production Safety Collaboration Innovation Center in Henan Province,Jiaozuo ,China;2.Cultivation Base of Province and Ministry Joint Established State Key Lab-Henan Provincial Key Lab of Gas Geology and Gas Control,Henan Polytechnic University,Jiaozuo ，China;3.School of Safety Science and Engineering,Henan Polytechnic University,Jiaozuo ,China

为研究煤岩瓦斯复合动力灾害发生的机理,从细观角度对三交河煤矿、屯留煤矿、平煤十矿煤样原生孔隙和裂隙等参量进行分析,选取平煤十矿煤样作为力学试验研究对象,采用自主研发的含瓦斯煤岩受载变形破坏试验装置,利用DS-5型全信息声发射信号分析仪,分析其在不同瓦斯压力条件下力学性质和声发射特征,并对声发射的计数、累计计数、能量、累计能量等在不同瓦斯压力下的演化规律进行了对比分析。结果表明:随着瓦斯压力的增大(0~2 MPa),煤样的峰值强度和弹性模量呈降低趋势,泊松比呈升高趋势,其抗压强度下降22.61%,弹性模量下降23.97%,泊松比增加33.67%;不同瓦斯压力下煤样受载破坏过程中的声发射都经历了平静期、活跃期、提速运动期、残余运动期4个阶段,且煤样的声发射累计计数和累计能量随着瓦斯压力的增加而降低,其声发射累计计数减小了32%,累计能量降低了25.32%。研究成果有利于发现煤岩体破坏的细观机理,为找到煤岩体破坏失稳预测预报方法和指标提供了依据。

In order to study the mechanism of gassy coal-rock complex dynamic disaster,based on the analysis of primary porosity and fractures of the coal samples of the Sanjiaohe colliery,Tunliu colliery and the 10th Mine of Pingdingshan coal group,this paper selected the coal samples of Pingdingshan as subject.Then,by using the self-developed device which contained the gas and coal-rock samples in deformation and failure under load and DS-5 full information acoustic emission signal analyzer,the experiment analyzed the mechanical properties and acoustic emission characteristics of coal-rock under different gas pressure.It also analysed the evolution of acoustic emission count,cumulative count,energy,and accumulated energy under different gas pressure.The result shows that:with the increase of gas pressure (0～2 MPa),the peak intensity and elastic modulus of coal samples decrease,but the Poisson's ratio increases.The compressive strength decreases by 22.61%,the elastic modulus decreases by 23.97% and Poisson's ratio increases by 33.67%.The acoustic emission of coal samples under different gas pressure have experienced four stages: stationary period,active period,speed-up movement period and residual motion period.The coal samples’acoustic emission cumulative count and accumulated energy decreases with increasing gas pressure,and the acoustic emission cumulative count decreases by 32% and the cumulative energy declines by 25.32%.The research results are helpful to find out the meso-mechanism of coal and and provide the basis for predicting the failure of coal and rock mass.