多场耦合条件下煤岩剪切破坏-渗流耦合机理及煤层瓦斯渗透性研究

项目名称： 多场耦合条件下煤岩剪切破坏-渗流耦合机理及煤层瓦斯渗透性研究

项目编号： No.51474040

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 矿业工程

项目作者： 许江

作者单位： 重庆大学

项目金额： 85万元

中文摘要： 煤岩体中产状不同且大小不一的裂隙既导致煤岩呈现非均质、非线性、非连续及各向异性，同时也是煤层瓦斯运移的主要通道。因此，开展煤岩裂隙开裂、扩展、贯通损伤演化机制及其对煤层渗透性影响的研究，对煤层瓦斯高效抽采既具重要的理论研究价值也有实际指导意义。本项目采用实验室试验、理论研究、数值分析与工程实际相结合的方法，在开展煤岩孔裂隙结构发育特征及其对煤层含气性影响、不同尺度条件下压剪荷载作用时完整煤岩结构损伤演化机制及其渗透性演化规律、不同充填条件下压剪荷载作用时破断煤岩体之裂隙面剪切破坏机制及其渗透性演化规律等基础上，阐明煤岩剪切破坏－渗流耦合机理及其与煤层瓦斯抽采之间的协同关系，构建地应力场、瓦斯压力场和环境温度场多场耦合煤岩剪切破坏-渗流耦合模型，揭示原岩地应力状态及采动影响条件下煤层瓦斯赋存与运移演化规律，指导煤层瓦斯抽采中瓦斯压力及其吸附解吸状态演化研究，为煤层瓦斯高效抽采奠定理论基础。

中文关键词： 煤岩；瓦斯；多场耦合；剪切破坏-渗流；渗透性

英文摘要： The fissures of variety sizes and variety occurrences in coal have been condemned to cause discontinuous, nonlinear, anisotropic and heterogeneity of coal, which also form a channel for flow of gas in coal-seam. It is of great significance to develop studies about the influence of fissure development and evolution of the coal fissures on coal permeability for the efficient extraction of coal-seam gas. This project will be carried out by combining the methods of laboratory experiments, theoretical research and engineering practice. A series of laboratory experiments will be conducted, i.e. studies on the impact of the fissure developing characteristics of the coal pore-fissure structure on coal reservoir gas, researches on the mechanism of structure damage evolution of the complete coal under different shearing loading conditions and the evolution law of permeability, and the shear failure mechanism of fissures and its evolution law of the broken coal under different filling conditions. Based on experimental results above mentioned, the objective of this project is to clarify collaborative relationship between shear-seepage coupling mechanism and the coal-seam gas extraction. Then a coupling model of shear-seepage for coal will be constructed with considering about stress, gas pressure and ambient temperature, thereby revealing the evolution law of deposit and migration of coal-seam gas occurred in original rock stress state under mining conditions. The research results will give guidance on the evolution of gas pressure and its adsorption and desorption states in coal-seam gas extraction as well as providing theoretical support for the effective extraction of coal-seam gas.

英文关键词： coal;gas;multi-field coupling;shear-seepage;permeability