渗流-应力耦合作用下岩石三维充填裂隙的扩展机理研究

项目名称： 渗流-应力耦合作用下岩石三维充填裂隙的扩展机理研究

项目编号： No.51279096

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 水利工程

项目作者： 李廷春

作者单位： 山东科技大学

项目金额： 82万元

中文摘要： 天然岩体中的裂隙被介质充填和含水是一种较为普遍的现象，充填物对裂隙的扩展和渗流有重要的影响，裂隙水的存在会大大加速裂隙的扩展，而且裂隙的扩展和渗流相互促进。目前，充填物对裂隙扩展的影响研究多关注裂隙面之间的摩擦效应，渗流-应力耦合作用下裂隙扩展的试验、理论、模拟有待进一步完善。本项目采用室内试验、理论分析和数值计算相结合的方法，系统研究岩石三维充填裂隙在渗流-应力耦合作用下的扩展机理。利用真实岩石通过切割、粘结技术制作含三维裂隙的试件，借助CT实时扫描技术，进行全应力-应变过程渗流试验，研究岩石三维表面和内置充填裂隙在渗流-应力耦合作用下的起裂条件、扩展模式、岩桥贯通及其相应的力学机制；考虑多种损伤机制，建立渗流-应力耦合作用下可考虑三维裂隙相互作用及有效反映充填介质的裂隙岩体断裂损伤模型和损伤演化方程；通过数值计算模拟三维裂隙扩展、岩桥贯通等动态演化过程，揭示裂隙不同扩展现象的潜在机制。

中文关键词： 岩石力学；充填裂隙；渗流；CT试验；扩展机理

英文摘要： It is a common phenomenon that the fractures of natural rock mass are filled with medium and water. The filled medium has an important effect on the fracture propagation and seepage flow, and the fracture propagation will be dramatically accelerated by the fracture water, furthermore, the propagation and seepage of fractures promote each other. At present, the research of fracture propagation influenced by the filled medium pays more attention to the friction effect of crack faces, and the test, theory and simulation of fracture propagation under coupled seepage-stress fields need to be improved. Through the combination of laboratory experiment, theory analysis and numerical calculation, the project studies the propagation mechanism of the 3-D filled fractures in real rock under coupled seepage-stress fields. The specimens that are used in the experiment of complete stress-strain process seepage are made by cutting and bonding technology from real rock. From the tests, the initiation condition, propagation mode, coalescence of rock bridge and relevant mechanical mechanism of 3-D surface and internal fractures are studied with the help of CT real-time scanning technology. Considering a variety of damage mechanism, 3-D fractures interaction, and reflecting filled medium effectively, the fracture-damage model and t

英文关键词： rock mechanics；filled fractrure；seepage；CT-test；propagation mechanism