摘要
研制了一套煤与瓦斯突出模拟实验装置，通过高速摄像对突出全过程进行实时观测，从而实现对突出过程中煤体破裂演化规律进行了分析。通过对12次试验结果的分析发现，煤与瓦斯突出是个力学发展过程，它经历了孕育、启动、发展和停止4个阶段，受瓦斯压力和孔洞壁的径向应力大小影响，煤与瓦斯突出多次间歇式发展；实验条件下，煤与瓦斯突出启动后，从发展到结束过程耗时不足0．1s；位于试验装置不同部位的煤体，突出瞬间煤体运动轨迹各不相同；通过对突出后煤体的裂纹分布规律进行分析，发现裂纹几乎平行出现，且裂纹的倾斜角度处在65°～70°，裂纹近似圆弧，圆心位置在突出口；试验还发现在0．481～0．764MPa存在一个临界瓦斯压力值，可以使突出连续发生．从而具备了发生大型突出的瓦斯压力条件。
The article developed a set of coal and gas outburst simulation equipments by ourselves. Keal-hme observation of the coal and gas outburst process was obtained by using a high-speed video camera, and the coal rupture evolution law of coal and gas outburst process were analyzed. The author analyzed 12 tests and the results show that coal and gas outburst is a mechanical process of development. It has gone through a birth, start, development and stop four stages. Because of the effects of gas pressure and the radial stress of holes in the wall, coal and gas outburst experiences mutiple intermittent development; during the experimental conditions, coal and gas outburst starts, it consumes less than 0.1 s from the development to the end ; coal in different parts of the test apparatus has different trajectory during the moment of outburst. After outburst, the author analyzed the crack distribution of the coal, and found that cracks emerged almost parallely, the crack angle was between 65°and 70°. The crack was like approximate arc, and the center position was in a prominent mouth. The test of experiment also shows that there is a critical value between 0. 481 MPa and 0. 764 MPa gas pressure. It can highlight the succession,which makes a big outburst possible.
出处
《煤炭学报》
EI
CAS
CSCD
北大核心
2012年第6期978-983,共6页
Journal of China Coal Society
基金
国家自然科学基金资助项目(40804070)
国际科技合作资助项目(2008DFB70100)
煤炭资源与安全开采国家重点实验室资助项目(SKLCRSM09X01)
关键词
煤与瓦斯突出
煤体破裂
演化
模拟实验装置
实时观测
coal and gas outburst
coal rupture
evolution
simulation experiment device
real-time observation
