祁东井田地应力场特征及其对煤与瓦斯突出的影响

Ground stress field characteristics and their influence on coal and gas outburst in Qidong well field

地应力是煤与瓦斯突出的重要动力,区域应力场是不同期次构造运动在该区域综合作用的具体体现。结合区域应力场和区域构造断块划分,研究了祁东井田应力场及其对煤与瓦斯突出的影响。结果表明:祁东井田最大、中间、最小主应力与煤层埋深呈正相关关系,且其最大主应力明显比位于华北地区的焦作中马村矿,平顶山一矿、六矿、八矿,以及华东地区的淮南潘一矿、谢一矿都大得多;祁东井田处在高应力区,地应力是9号煤层25次煤与瓦斯突出的主导因素;该井田东部地应力较集中,瓦斯含量大,煤与瓦斯突出危险性较大。

Ground stress is the important power of coal and gas outburst, regional stress field is the concrete re-flection of the comprehensive results of tectonic movements of different periods in a region. Combining regional stress and regional tectonic fault block division, the paper studied Qidong stress field and the impact on coal and gas outburst. The results show that the relationship between coal seam depth and maximum, intermediate, minimum principal stress of Qidong well field is positive correlation. Furthermore the maximum principal stress is obviously much greater than that of Jiaozuo Zhongmacun mine, Pingdingshan No.1 mine, No.6 mine, No.8 mine located in North China and Huainan Panyi mine, Xieyi mine located in East China. As Qidong well field is in the high stress region, ground stress is the primary factor of 25 coal and gas outbursts in No.9 seam. The ground stress is concen-trated in the east of the field,and the gas content is very high, leading to the great danger of coal and gas outburst in the region.