School of Safety Engineering, China University of Mining and Technology

为研究煤与瓦斯突出的动态过程,利用真三轴煤与瓦斯突出模拟试验系统,开展不同条件下的煤与瓦斯突出模拟试验,动态监测突出过程中应力、瓦斯压力变化特征,统计分析抛出煤体的分布特征。结果表明,突出是否发生存在一个瓦斯压力阈值,高于该阈值,突出强度随着瓦斯压力增大而增大。突出孔洞口小腔大、呈梨形,孔洞后方煤体越靠近突出孔洞破碎程度越高。抛出煤体在水平地面呈梭形条带分布,以小粒径的粉煤为主,主要集中在远离突出口的区域,随着瓦斯压力的增大抛出煤体的粉碎效果越明显。煤与瓦斯突出是一个快速发展的动态过程,可划分为孕育、激发、发展、终止以及抛出5个阶段。

In order to study the dynamic process of the coal and gas outburst, a true triaxial coal and gas outburst simulation test system was applied to conduct th e simulation test of the coal and gas outburst under different condition, dynamically monitor and measure the stress and gas pressure variation features in the outburst process and statitically analyze the distribution features of the threw coal. The results showed that there was a gas pressure threshold value existed that the outburst occurred or not. When the gas pressure was higher than the threshold value, the outburst strength would be increased with the gas pressure increased. The outburst ho le would have a small mouth and a big chamber in a pear shape and the coal behind the hole more closed to the outburst bole would be in a higher broken degree. The threw coal on the horizontal ground would be in a shutle shape stripe distribution, would be small particle fine coal mainly and would be concentrated at an area far fro m the outburst outlet. With the gas pressure increased, the broken effect of the thrown coal would be more remarkable. The coal and gas outburst would be a dynamic process of the rapid development and could be divided into five stages of inoculation, excitation, development, termination and throwing.

国家自然科学基金青年科学基金资助项目(51204173)；