剪切荷载作用下煤岩裂隙细观演化及其对瓦斯渗流的影响研究

项目名称： 剪切荷载作用下煤岩裂隙细观演化及其对瓦斯渗流的影响研究

项目编号： No.51304255

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： 彭守建

作者单位： 重庆大学

项目金额： 25万元

中文摘要： 瓦斯作为煤的伴生产物，既是煤矿重大灾害源，也是一种宝贵的清洁能源。实现煤与瓦斯安全高效共采，是深部煤炭资源开采的必然途径。项目围绕煤与瓦斯共采中的瓦斯-煤岩流固耦合作用机制这一关键科学问题，并重点着眼于煤岩剪切破断过程中有效渗流网络演化及其与瓦斯解吸、渗流之间的耦合作用规律，通过自制电液伺服控制含瓦斯煤压剪-渗流试验装置，从细观角度，开展煤储层原生孔裂隙结构特征及其含气性主控因素、剪切荷载作用下含瓦斯煤岩裂隙开裂扩展细观演化规律及剪切裂纹开裂扩展过程中含瓦斯煤岩渗流特性等方面的试验研究工作，探明煤岩裂隙细观演化规律及其对煤层含气性及瓦斯渗流的控制机制。并构建含瓦斯煤渗流网络细观特征参数及其与渗透率之间的关系，在此基础上建立耦合渗流网络特征参数的瓦斯渗流模型，通过数值模拟方法将建立的模型应用到煤层开采分析中，揭示煤岩体裂隙演化与瓦斯运移耦合作用机理，为煤与瓦斯安全高效共采提供科学依据。

中文关键词： 含瓦斯煤岩；剪切荷载；微观裂纹；演化规律；贯通机理

英文摘要： Coal is used as the most important resource in China. As a associated product in coal, gas is not only a valuable clean energy, but also it is considered as a major disaster source of coal mine. Therefore, obtaining coal together with gas safely and efficiently is necessary for the mining exploitation of coal resources in the deep area.This project mainly focuses on the gas-coal rock coupling mechanism, especially the evolution process of effective percolation network caused by the rupture of coal and rock, as well as the coupling effect between the evolution of percolation network and percolation and desorption of gas. In the physical experiment, self-developed electro-hydraulic servo-control compression shear-seepage device of coal containing methane was used. In order to better understand the evolution laws of shear microcracking in the coal rock containing-gas and its control mechanism for the percolation of gas, the properties of native hole cracks structure in coal reservoir, the main factors of containing gas and the evolution laws of shear microcracking and expansion of gas-containing coal under compression-shear load condition were studied. The percolation characteristics of coal rock containing-gas in the expansion process of the shear crack were studied also. Synchronously, the relationship between th

英文关键词： Gassy coal-rock；Shear load；Micro cracks；Evolution law；Mechanism of crack coalescence