立井揭高瓦斯深埋煤层围岩力学特性数值模拟研究

为从细观结构层次上研究立井揭穿高瓦斯深埋煤层时围岩的力学特性,利用基于含瓦斯煤岩破裂过程固-气耦合动力学模型开发的RFPA2D-Flow软件,对立井揭煤时围岩的应力演变,瓦斯压力梯度场发展,瓦斯运移规律进行了数值模拟研究,对揭煤时煤与瓦斯突出过程从细观上进行了再现。数值模拟结果表明高地应力、高瓦斯含量和梯度、较厚的松软煤体综合影响立井揭穿高瓦斯深埋煤层时的力学特性并增加了煤与瓦斯突出的危险性。

Numerical Simulation on Mechanical Mechanism of the Wall Rock in Deep Embedding Coal Seam with High Gas Pressure Uncovered by Vertical Shaft

In order to study the mechanical characteristic of the wall rock in deep embedding coal seam with high gas pressure uncovered by the vertical shaft on a meso-aspect,the stress evolution,the gas pressure grandiemt development and the gas flowing rule during the uncovering work were simulated by RFPA2D-Flowsoftware which developes on the basis of the solid-gas coupling dynamic model. The simulating results show that the high crust stress,the high gas content and gas gradient and the thick soft coal seam jointly influence the mechanical mechanism of the wall rock in deep embedding coal seam with high gas pressure uncovered by vertical shaft and aggravate the fatalness of coal and gas outburst.