黄土滑坡双层复合滑动液化机理研究

项目名称： 黄土滑坡双层复合滑动液化机理研究

项目编号： No.41272341

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： 洪勇

作者单位： 青岛理工大学

项目金额： 82万元

中文摘要： 目前对于导致黄土滑坡发生高速远程运动的双层复合滑动液化现象尚缺少系统深入的研究。本项目以大型环剪试验为主要手段，结合现代可视化数字图像观测与分析技术，对黄土滑坡滑动过程中产生的双层复合滑动液化现象进行试验和理论研究。通过试验以及基于离散单元理论的颗粒流数值模拟分析，研究黄土在与其它液化土体接触滑动过程中，滑带(面)处土体细观结构和孔隙水变化规律及其相互作用关系，分析双层复合滑动液化产生的条件和特征，进而从宏观和细观角度揭示黄土滑坡双层复合滑动液化发生机理。按照液化物质组成和地质条件的差异，针对典型黄土滑坡建立能够反映不同土体间剪切力学特性的双层复合滑动液化模型。通过本项研究不仅能够推动土力学理论中有关异质土体间剪切力学特性的研究，并且为地质灾害防治理论提供研究依据，因此具有重要的学术意义和工程应用价值。

中文关键词： 滑坡；液化；黄土；环剪；颗粒流

英文摘要： It is very important and significant to study the complex mechanism of the double layers composite sliding liquefaction that occurs in the loess landslide. By taking the large-scale ring shear test as the major approach and integrating with the modern visualization digital imaging techniques, this project carries out the experimental and theoretical research on the double layers composite sliding liquefaction phenomenon occurred during loess landslide. Through the test and PFC (Partical Flow Code) numerical simulation analysis based on the discrete unit theory, this project will study the changing rules and interaction relationship between the micro structure of soil mass and the pore water at sliding zone (surface) during the contacting and sliding process of loess with other liquefied soils. By analyzing the generating condition and the characteristics of double layers composite sliding liquefaction, the mechanism of the double layers composite sliding liquefaction will be further revealed. According to the differences of the liquefied materials and the geological conditions, the double layers composite sliding liquefaction model specific to typical loess landslide will be established, which can reflect the shear mechanical properties of different soil masses. At the same time, the ring shear test and the micr

英文关键词： landslide；liquefaction；loess；ring shear；partical flow