中文摘要：

采用自主研制的三轴瓦斯渗透仪进行了原煤试件在固定瓦斯压力下,不同围压和轴向压力的瓦斯渗流实验。实验结果表明,随着围压的增加,原煤煤样的渗流速度呈下降趋势,这种影响对原始损伤严重的煤体更加明显,并建立了渗流速度围压二次函数关系的一般表达式。原煤煤样的渗流速度应变关系类似于应力应变关系,因此,可以利用原煤渗流速度的变化间接反映煤体的受力损伤演化过程,有效应力对原煤煤样的渗流速度影响总体上可以分为敏感阶段和平缓阶段,在敏感阶段,煤样的渗流速度变化大,而在平缓阶段,煤样的渗流速度变化小。在不同的应力条件下,煤体中孔隙裂隙发育程度和开闭程度不同,影响煤体内的瓦斯内能和弹性变形能,也影响煤体的破坏形式。

英文摘要：

The experiments of outburst coal＇s gas seepage are carried out by triaxial permeameter which is independently developed.Under the condition of fixed gas pressure,different confining pressures and axial pressures acting on raw coal test samples are tested.It shows that as the increasing of confining pressure,coal sample seepage velocity tends to decline,and this phenomenon is more obvious for the coal with serious original injury.The relationship between seepage velocity and confining pressure can be described as a quadratic function,and its general expression is established.Coal sample＇s seepage velocity-strain path is similar to stress-strain path,therefore,the changes in coal seepage velocity indirectly reflects the process of the evolvement of coal damage.The influence of effective stress on coal sample seepage velocity can be concluded as hypersensitive stage and smooth stage,and in the hypersensitive stage,seepage velocity of the coal sample vary quickly,while in smooth stage,its variety is not obvious.In different stress conditions,the degree of development for hole and cranny of coal affect coal gas energy and elastic deformation energy in coal body as well as the form of coal destruction.