边坡泥化夹层细观渐进损伤破坏动态演化规律研究

Similar to the other geotechnical materials, the mudded intercalation shows progressive damage under external factors and the inner micro physical or geometry parameters also keep variational. Undoubtedly, the extension of inner flaws is tightly related to the whole strength of mudded intercalation and then make a difference on the stability of slope indirectly. Based on theories of mesomechanics and damage mechanics , this project attempts to study the change law of strength and other macroscopic parameters which is caused by the progressive evolution of microscopic damage . For this purpose, the physical and geometry micro-parameters will be researched firstly and then technical means including site investigation, indoor tests and numerical analysis will be tied together closely to perform the study. Afterwards, the project intends to set the classification rules of various mudding catations according to the feature of micro-fabric.Meanwhile, the micro-mechanics model could be built and the mechanical response of the mudded intercalation model under different boundary conditions could also be figured out. In this way, taking damage variables into account, the mesoscopical damage model should be established after quantifying the structure parameters in different damage stages to reveal the dynamic law of progressive damage. As a result, this project would be of great significance to provide theoretical reference and scientific basis for the stability analysis or reinforcing design of the slope with mudded intercalation.

泥化夹层在受到外界因素作用下，整体表现为渐进损伤过程，其内部细观物理几何参数也不断发生变化，内部缺陷的渐进扩展程度直接关系到泥化夹层的整体强度，从而影响到整个边坡的稳定。本项目拟从泥化夹层的细观物理几何参数出发，采用现场调查及室内试验、数值分析等技术手段，运用细观力学及损伤力学理论，研究其在外界条件作用下，内部细观缺陷的渐进损伤演化特征及由细观损伤引发的宏观强度等参数的动态演化规律。依据细观组构特征制定泥化夹层分类准则，建立泥化夹层细观力学模型，获得泥化夹层细观力学模型在不同边界条件作用下宏细观参数之间的力学响应；结合损伤变量建立泥化夹层细观损伤模型，定义及量化不同损伤阶段的结构参数，揭示泥化夹层渐进损伤破坏动态演化规律。为因泥化夹层渐进损伤破坏而导致的渐进失稳边坡工程防治提供理论参考与科学依据。

泥化夹层在受到外界因素作用下，整体表现为渐进损伤过程，其内部细观物理几何参数也不断发生变化，内部缺陷的渐进扩展程度直接关系到泥化夹层的整体强度，从而影响到整个边坡的稳定。基于该项目，发展了泥化夹层细观力学理论，构建了“结构量化-相似聚类-图像融合-结构模型-代表性体积单元-细观力学模型-损伤规律”的泥化夹层细观结构力学研究体系，量化了泥化夹层细观结构特征，建立了细观组构代表性单元模型，推导了细观力学模型，获取了宏观力学特性与细观结构关联机制，揭示了不同环境状态下泥化夹层的损伤演化规律。进一步在项目研究基础上，首次提出了泥化夹层的微波辐照加固方法，将泥化夹层“遇水即坏”改良为了“遇水更强”，实现了对泥化夹层的绿色、高效加固。本项目为因泥化夹层渐进损伤破坏而导致的渐进失稳边坡工程防治提供理论参考与科学依据。