卸荷煤体细观损伤演化与瓦斯渗流的耦合作用研究

项目名称： 卸荷煤体细观损伤演化与瓦斯渗流的耦合作用研究

项目编号： No.51204173

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 冶金与矿业学科

项目作者： 周红星

作者单位： 中国矿业大学

项目金额： 25万元

中文摘要： 荷载煤体细观裂隙演化及瓦斯渗流是国内外研究的热点，但从细观角度研究不同荷载煤体损伤演化与瓦斯渗流相互作用的成果较少。本项目采用理论研究与实验室实验相结合的方法。首先，按设计卸载的力学路径进行型煤试件的CT扫描试验，揭示卸荷煤体细观损伤、内部裂隙演化规律；然后，采用与CT扫描试验完全相同的力学路径和力学参数进行型煤试件的瓦斯渗流实验，揭示卸荷煤体的瓦斯渗流特性；最后，叠加卸荷煤体内部裂隙演化与瓦斯渗流的研究成果，综合分析卸荷煤体的细观损伤演化对瓦斯渗流的影响，建立卸载煤体应力-损伤-瓦斯渗流耦合作用模型。本项目的研究实现了从细观角度直观研究裂隙演化特征及其对瓦斯渗流的影响，能够为保护层开采和卸压瓦斯抽采提供理论基础。

中文关键词： 卸荷；细观损伤；瓦斯渗流；耦合；保护层开采

英文摘要： The meso-damage evolution and gas seepage of unloaded coal is the research focus of domestic and foreign scholars. The CT test that is used to describe the direct damage evolution can not be simultaneously applied on gas seepage experiments. Both theoretical experimental methods are to be adopted in this project. First, the CT scanning tests are to be conducted following the designed mechanic paths in order to study the damage and internal crack evolution from a micro perspective. Then, gas seepage tests are to be conducted to unveil the seepage characteristics under the same paths and parameters of the CT tests. Finally, the research results of the both tests are to be coupled to analyze the influence of meso-damage evolution of unloaded coal on gas seepage, and to build the stress-damage-seepage coupling model of unloaded coal. The results will enable the direct study on the influence of meso-damage evolution of on gas seepage, and provide a better guide on the protective layer mining and pressure-relieved gas drainage.

英文关键词： unload；meso-damage；gas seepage；coupling；protective seam exploitation