渗透压-热力耦合作用下岩石变形劣化过程细观试验与机理耗散分析

项目名称： 渗透压-热力耦合作用下岩石变形劣化过程细观试验与机理耗散分析

项目编号： No.41272329

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 天文学、地球科学

项目作者： 朱珍德

作者单位： 河海大学

项目金额： 85万元

中文摘要： 针对深埋地下采矿工程、油气工程及高放核废料处置工程具有高地应力、高温、高渗透压之特点，渗流场-应力场-温度场耦合作用下岩石变形劣化全过程的细观损伤力学问题成为当今国际岩石力学与工程研究的热点。本项目利用岩石破坏全过程细观力学实验系统，通过对天然和人工裂纹岩石试件在渗透压-热力耦合作用下进行单轴、三轴加载、卸荷全应力应变过程细观动态试验研究，用数字图像处理技术对动态试验的岩石细观结构进行定量描述，运用细观损伤力学、能量耗散理论、揭示岩石变形破坏过程中能量耗散的内在机制，定量描述在复杂状态下岩石微裂纹萌生、成核、扩展、贯通至破坏损伤演化规律，建立渗透压-热力耦合作用下岩石宏-细观损伤演化方程，给出基于能量耗散的强度丧失准则和基于可释放应变能的整体破坏准则，提出相应的数值计算方法，实现动态模拟裂纹扩展演化过程。此课题的研究解决是岩石力学领域的突破与创新，且对地下岩石工程加固有重要的理论指导意义。

中文关键词： 细观损伤力学；能量耗散；裂隙扩展；劣化机理；细观试验

英文摘要： In view of high geostress, high temperature and high osmotic pressure shown in underground mining engineering, oil and gas engineering and nuclear waste disposal engineering, the mesoscopic damage mechanics problem due to the deformation and degradation process of rocks under the coupled thermo-hydro-mechanical action have become an international hot issue among the research on rock mechanics and engineering nowadays. By use of rock failure process mesomechanical test system, the coupled thermo-hydro-mechanical behaviour rocks is investigated by conducting a series of mesoscopic dynamic experiments (including unaxial, triaxial loading and unloading) on natural and precracked rock specimens. The mesoscopic structure of the rock can be quantitatively described by dynamic tests with the help of digital image processing technology. Using the mesoscopic damage mechanics and energy dissipation theory, the internal mechanism of energy dissipation in the deformation and failure process of rock is revealed. In addition, the damage evolution law showing initiation, nucleation, expansion, coalescence of micro-cracks in complex conditions is quantitatively described, and the micro-macro damage evolution equations under the coupled thermo-hydrological action are established. The strength loss and failure criteria are propose

英文关键词： mesoscpoic damage mechanics；energy dissipation；crack propagation；degradation mechanism；mesoscopic test