孔隙压力在瓦斯突出过程中的作用机理研究

Study on Mechanism of Pore Pressure in Coal and Gas Outburst Process

考虑了煤岩体物理力学性质的非均匀性和非连续性的特点,应用岩石破裂过程分析系统(RFPA2D-GasFlow),对不同孔隙压力下煤体发生瓦斯突出的特征进行数值试验研究,分析了孔隙压力对瓦斯突出的影响。研究结果表明,不同孔隙压力条件下,煤体的破裂形式及瓦斯突出特征是不同的:当孔隙压力较小时,煤体产生剪切破坏,形成煤体倾出,此时,地应力在瓦斯突出中起主导作用。

Considered the heterogeneity and non- sueeession of coal, used rock failure process analysis （RFPA2D- GasFlow） eode, for different pore pressure of coal researched character of coal failure and gas outburst in mining process, analysis the influence of pore pressure of coal to gas outburst. Results showed, eharaeter of coal failure and process of gas outburst are different obviously with diverse pore pressure of eoal, as pore pressure very small, coal engendered shear failure, and the abutment stress is the main power for gas outburst. As pore pressure larger, coal engendered tension failure, induced gas outburst, and the gas is the main power for gas outburst.