库岸含砾滑带土的变形、强度特征与砾-土相互作用机制研究

项目名称： 库岸含砾滑带土的变形、强度特征与砾-土相互作用机制研究

项目编号： No.41272315

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： 张丹

作者单位： 南京大学

项目金额： 87万元

中文摘要： 本项目以三峡库区分布具有一定代表性的含砾滑带土为研究对象，通过分析库水位周期变动对滑带工程地质环境的影响，得到滑带有效应力场、水份场和温度场的分布特征和变化规律；通过CT扫描和数字图像处理技术，描述含砾滑带土的砾石组构特征，模拟库水位周期变动条件，采用大三轴试验、蠕变试验以及数值模拟方法研究含水率、围压、温度单一因素和多因素耦合作用下不同砾石组构特征含砾滑带土的变形、强度特征和蠕变特性，建立含砾滑带土的蠕变模型；结合数值模拟方法，探索含砾滑带土砾-土变形机理及砾石的空间运动规律，揭示滑带变形过程中砾-土相互作用过程及机制，为正确认识水库运行条件下滑坡活动机理提供依据。

中文关键词： 含砾滑带土；变形；强度；流变；砾石组构

英文摘要： The research object of this project is gravel-bearing slip soil which has certain representativeness on Three Gorges Reservoir Area. By analyzing the effect of periodic changes of the reservoir water level on the engineering geological environment of the sliding zone, the characteristics and its evolution law of effective stress field, moisture field and temperature field can be obtained. With CT scan and digital image processing technologies, characteristics of gravel fabric in the slip soil is described. By using large scale triaxial test, creep test and numerical simulation methods, we can get the deformation, the strength characteristics and creep properties of gravel-bearing slip soil. The experiments and simulation will be performed with the consideration of the fluctuation of reservoir water level, that is to say the moisture content, confining pressure and temperature will be changed individually and couplingly. The creep model of gravel-bearing slip soil can be established according to the experimental results. Combined with numerical simulation methods, gravel - soil deformation mechanism and movement law of gravel will be explored, and gravel - soil interaction processes and mechanisms during the slip zone deformation process can be revealed also. The experimental results can provide a good understand

英文关键词： gravel-bearing slip soil；deformation；strength；rheology；gravel fabric