构造区域应力场与煤与瓦斯突出区域预测

Stress Field in Tectonic Region and Regional Prediction of Coal and Gas Outburst

以地质动力区划方法划分的Ⅴ级活动断裂为构造格架,结合地应力测量,进行区域构造应力场数值模拟,从而确定区域岩体应力分布规律。结果表明:煤矿区域原岩应力分布状态主要受断裂构造的支配,断裂构造的叠加扰动使原岩应力场重新分布,从而在时间和空间上制约着煤与瓦斯突出的区域性分布。并对矿井开采所引起的煤与瓦斯突出危险性作出评估和预测,拓宽了煤与瓦斯突出预测途径。

Coal and gas outburst is restricted by some factors such as geo-stress, gas and coal solid structure etc, in which the tectonic stress aroused by geological structure plays a dominated role. The palaeotectonic stress promoted gas generation, changed conditions of gas occurrence and migration as well as the internal structure of coal. The modern stress dominated geo-stress, and took part in outburst directly. This paper, taking V level active faults divided by the geo-dynamic division as the tectonic frame and incorporating with the surveying of strata stress, made a numerical simulation of the stress field in the regional structure, and thus determined the stress distribution law in the regional rock mass. The result indicated that the distribution of regional initial rock stress in the mine depended upon the faults and was formed again due to the superposition by the fault action. Therefore, the regional distribution of coal and gas outburst in this mine was controlled by it from time to space. Then coal and gas outburst fatalness induced by coal mining can be evaluated and predicted. The approach of coal and gas outburst prediction is thus extended.