含瓦斯煤层力学特性的实验研究

AN EXPERIMENTAL STUDY ON THE MECHANICAL PROPERTIES OF GAS-BEARING COAL SEAMS

本文通过对山西沁水永红煤矿无烟煤合高瓦斯的渗透、变形和强度试验,得出了轴压、侧压、瓦斯压对含瓦斯煤层特性的影响规律。文章指出:含瓦斯煤的透气性随轴压和侧压的增大而按指数规律衰减;在临界瓦斯压力条件下,煤体的透气性最差;瓦斯的存在降低了煤的强度,增强了煤的塑性软化特性,使煤更易于变形失稳破坏。

Based on the results of percolation, deformation and strength tests on a gasbearing hard coal from Yonghong Coal Mine, Qinshui, Shanxi Province, the regularities with which the axial pressure,lateral pressure and gas pressure affect the mechanical properties of gas-bearing coal seams are presented in this paper. The paper indicates that the air permeability of gas-bearing coal attenuates exponentially with increasing axial and lateral pressures; the air permeability of coal body is the lowest under critical gas pressure and the existence of gas lowers the strength of coal, enhances the plastic softening feature of coal and thus makes coal more likely to rupture due to deformation instability .