渗透-组构-应力作用下的消落带滑带土弱化机理研究

项目名称： 渗透-组构-应力作用下的消落带滑带土弱化机理研究

项目编号： No.41272307

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： 吴益平

作者单位： 中国地质大学（武汉）

项目金额： 85万元

中文摘要： 针对大型水利水电工程中库岸滑坡长期稳定性研究中的关键科学问题，选取三峡库区巴东县黄土坡滑坡滑带土开展库水周期性大幅涨落条件下的消落带滑带土弱化机理研究。通过渗透模拟、力学试验、微观测试及数值模拟等技术手段，揭示滑带土在动态渗透压（渗透压"低-高-低-0-低-高-低"动态变化，反复循环进行）与应力耦合作用下物质组成、微观结构、水理特性和力学特性的动态响应规律。利用数字图像处理技术获取滑带土的微观结构特征，通过微观结构参数定量化与力学效应耦合分析，以系统动力学理论为基础，并结合PFC数值模拟，建立滑带土微观结构演化模型。基于广义粗集理论对获取的多源信息进行异类融合，建立微观-宏观信息融合的滑带土力学时变模型。在此基础上，结合滑带土弱化过程数值模拟成果，揭示渗透-组构-应力耦合作用下的消落带滑带土弱化机理。为探究库岸滑坡的演化过程、合理进行库岸滑坡长期安全性评价、有效进行库岸滑坡防治提供理论支撑

中文关键词： 滑带土；动态渗透压；微观结构；流变效应；弱化机理

英文摘要： For large water conservancy and hydropower project, long-term stability of the reservior bank landslide is a key scientific problem. The aim of this project is to analyse the weakening mechanism of slip soil of hydro-fluctuation zone in Huangtupo landslide in Badong by considering the significant cyclical fluctuations of water in Three Gorges Reservoir. By using osmometric modeling, mechanical tests, micro-test analysis and numerical simulation, dynamic response of slip soil in hydro-fluctuation zone, namely changes in composition, microstructure, hydraulic properties and mechanical characteristics, can be revealed under coupling action of dynamic osmometric pressure（change osmometric pressure substantially，under repeated loop "low-high-low-0-low-high-low", to simulate the significant fluctuation of reservoir water）with stress. In order to establish microstructure evolution model of slip soil, digital image processing technology is used to figure out its micro-structual features firstly. Then the mircostructure parameters are quantized and coupled with mechanical effect. Finally,combining System Dynamics Theory with the numerical simulation of PFC3D, microstructure evolution model of slip soil is established. Based on Generalized Rough Set Theory, the multi-source information is heterogeneously integrated to e

英文关键词： Slip zone soil；Dynamic infiltration pressure；Microstructure；Rheological effect；Weakening mechanism