项目名称： 加卸荷应力路径岩石渗透破坏的宏细观演化机制与模型研究

项目编号： No.41472270

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 地质学

项目作者： 张黎明

作者单位： 青岛理工大学

项目金额： 86万元

中文摘要： 工程开挖引起的岩体渗流应力耦合作用机制是岩石力学亟待解决的理论难题，以加荷试验结果解释岩体渗透破坏与实际岩体卸荷路径不相一致。项目拟开展岩石三轴加卸荷渗透试验，诠释加卸荷路径岩石渗透性演化的宏观特征和内在关联。通过岩样切片观察，基于数字图像处理技术，改进C-V模型实现岩石组份的多相分割，建立岩石真实细观结构几何模型，通过编程将其嵌入有限元程序，揭示相同细观结构岩石加卸荷破坏过程渗透路径的空间分布与时变规律，探索渗透破坏开始阶段裂纹发展的迟滞性与最终破坏的突发性机制。根据广义塑性力学理论，给出加卸荷路径岩石渗透破坏过程的屈服函数，构建岩石渗流应力耦合作用本构模型。根据最小势能原理，提出加卸荷路径岩石渗透破坏的力学判据，探索岩石渗透破坏从迟滞阶段到突发阶段的征兆及转化条件。研究成果对于深化卸荷路径岩体渗透破坏机理认识、预测与防治岩体灾害具有重要的理论意义和工程价值。

中文关键词： 卸荷；渗透性；数字图像；细观结构；本构模型

英文摘要： Rock seepage failure mechanism caused by engineering excavation is one of the rock mechanics theory problems.Rock hydromechanical coupling mechanism has difference between loading and unloading stress paths.Triaxial loading and unloading tests will be conducted on rocks to study the macro features and inherent relationships between the permeability evolution and stress pahts.Combined with rock samples section observation,the revised C-V model will be used to realize the multiphase split of rock components by using PDE's digital image processing technique.Then rock real mesoscopic geometrical model will be obtained.The mesoscopic geometrical model will be embedded in ABAQUS program through the Python language programming.The spatial distribution and time varying law of rock permeability paths will be revealed.The crack development mechanism from the lag stage to the burst stage during rock seepage failure process will be discussed.According to the generalized plastic mechanics theory,rock yield function forms under loading and unloading stress paths will be established.Rock hydromechanical coupling constitutive model under loading and unloading stress paths will be built.Based on the minimum potential energy theory,rock seepage failure mechanical criterion will be put forward.Rock seepage failure signs from the lag stage to the burst stage will be discussed.The results have a great theoretical and practical value for deepening research of rock seepage failure mechanism under unloading stress path, predicting and preventing rock disasters.

英文关键词： unloading;permeability;digital image;meso-structure;constitutive model