采动应力与工作面突出指标相关性分析

Correlation analysis of mining stress and working face outburst index

为准确预测采掘工作面煤与瓦斯突出危险性,以甘肃魏家地煤矿东一采区东1100工作面为例,研究采动应力对突出指标的影响因素。采用数学统计的方法并结合井田情况,通过研究煤层瓦斯压力与钻屑解吸指标二者之间的量化关系,推导出采动应力与瓦斯突出指标之间的关系,通过观测回采工作面的矿压,能够定量分析一定范围内煤体的瓦斯突出指标,通过测量瓦斯突出指标,判断煤体采动应力的分布情况。研究表明:采动应力对瓦斯突出指标产生一定影响,采动应力与钻屑解吸指标可以相互推导求值,两者之间的拟合函数为二次函数关系;随着采动应力的增大,钻屑解吸指标和最大钻屑量均先增大,逐渐趋于平稳后又迅速增大,存在正相关性关系。

In order to accurately predict the risk of coal and gas outbursts in the mining face,the east 1100 working face of Weijiadi coal mine in Gansu Province was taken as the research object,and the influence factors of mining stress on the outburst index were studied.By using the method of mathematical statistics and combining with the situation of the mine field,the quantitative relationship between the gas pressure of the coal seam and the desorption index of the drilling cuttings was studied,and the relationship between the mining stress and the gas outburst index was deduced.Through the observation of the mine pressure of the mining face,the gas outburst index of the coal body in a certain range could be quantitatively analyzed,and the distribution of the mining stress of the coal body could be judged by measuring the gas outburst index.The results show that mining stress has a certain influence on the gas outburst index.The mining stress and the desorption index of the drilling cuttings can be derived from each other.The fitting function between the two is quadratic.With the increase in mining stress,the desorption index of drilling cuttings and the maximum amount of drilling cuttings increase first,gradually stabilize,and then increase rapidly,indicating a positive correlation.