解吸-渗流-应力作用下煤体变形规律及机理研究

项目名称： 解吸-渗流-应力作用下煤体变形规律及机理研究

项目编号： No.51304111

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 矿业工程

项目作者： 孙维吉

作者单位： 辽宁工程技术大学

项目金额： 25万元

中文摘要： 瓦斯在煤体中渗流引起孔隙压力变化，孔隙压力和应力耦合作用使得煤体压缩变形，煤体渗透率降低；同时煤体因解吸瓦斯收缩变形渗透率增加，进行解吸-渗流-应力作用下煤体变形规律研究对揭示瓦斯在不同的煤层流动过程中煤的变形规律及阐明煤渗透率演化机理有重要意义。采用实验室实验和理论分析相结合的研究方法，进行不同地区、不同成煤时期、不同变质程度的煤吸附/解吸瓦斯过程煤体变形实验，揭示不同煤吸附/解吸瓦斯过程的煤体变形规律；开展解吸-渗流-应力作用下煤体变形实验，探索煤中瓦斯解吸、渗流及在载荷作用下煤体变形叠加关系；开展不同变形特征煤体解吸瓦斯过程煤体孔隙结构演化微观实验，阐明煤解吸瓦斯过程中煤体孔隙结构演化机理和解吸-渗流-应力作用下煤体变形机理。为研究我国不同地区煤在解吸瓦斯过程中的煤体变形规律，辨识煤层瓦斯抽采难易程度及指导煤层气选区，进一步研究煤与瓦斯突出发生机理提供理论依据。

中文关键词： 煤体变形；解吸-渗流-应力作用；变形机理；突出煤；测试方法

英文摘要： The coal pore pressure will change during the seepage of gas in the coal. The coal deformation will be compressed under the coupling action of pore pressure and stress,and the permeability of coal is reduced. At the same time, the permeability of coal increase because of coal matrix shrinkage caused by desorbing of gas. It is very important for clarifying the law of coal matrix deformation and the evolution mechanism of coal permeability under the effect of desorption-seepage-stress. The law of deformation caused by adsorption/desorption of different coal forming period, different metamorphic grades coal, which is come from different regions in China, is studied by the laboratory experiments and theoretical analysis.The coal superimposed deformation will be studied,through the experiment of coal matrix deformation under the effect of desorption-seepage-stress. The micro experiment will be carried out to study pore structure of coal matrixes and the law of coal matrix deformation caused by desorption, in order to uncover the coal deformation mechanism under the effect of desorption-seepage-stress. All the studies above will be helpful to reveal the characteristics of coal deformation caused desorption in China, to distinguish the complexity in CBM extraction,to select good coalbed methane block，and to study the m

英文关键词： coal matrix deformation；desorption-seepage-stress effect；deformation mechanism；outburst coal；test method