网格状带齿加筋体筋-土界面特性及其三维细观机理研究

项目名称： 网格状带齿加筋体筋-土界面特性及其三维细观机理研究

项目编号： No.51209132

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 水利科学与海洋工程学科

项目作者： 林永亮

作者单位： 上海大学

项目金额： 25万元

中文摘要： 筋-土界面特性是加筋土结构设计的基础。对界面特性进行合理预测的一个关键点是如何揭示筋-土界面内局部变形场的变化特征，而目前的研究方法无法测得内部的三维变形特性。申请者首先提出了一种新型网格状带齿加筋体，其不仅汲取了传统水平网格状筋材的优点，而且由于齿筋的存在可增加侧阻力，能有效改善筋-土界面特性。为此，本项目拟采用试验、数值模拟和理论分析三种方法对其界面作用机理进行研究。主要内容：以透明土为试验介质，借助拉拔试验分析筋-土界面的力学特性，采用三维图像分析技术揭示筋-土接触面内局部变形场的形成规律；应用离散元方法系统分析筋-土接触界面效应的形成和发展规律；结合试验和数值模拟结果，将三维细观特性与力学行为相结合，进一步揭示筋-土间的相互作用机理，并建立网格状带齿加筋体的界面力学模型。研究成果将拓展和丰富加筋体系，对阐明筋-土作用机理及指导加筋结构的工程设计，具有重要的理论意义和工程实用价值。

中文关键词： 网格状带齿加筋；界面特性；三维细观结构；作用机理；

英文摘要： The interface behavior of geosynthetics and soil is a premise for structure design of reinforcement. The intriguing mechanism of reinforcement and how it will affect the general behavior of reinforced soil have been investigated by many researchers, and most of these work focused on the macromechanical properties. Considering the fact that soil is granular material, initialization and development of contact interface is also affected by the microstructural properties. As the result, in order to shed more light into the mechanism of the interaction between geogrid and soil, it is necessary to find the links between mechanical behavior and microstructural properties. However, only the macromechanical properties and deformation of boundary region can be achieved through conventional experiments, and the microstructural properties can not be obtained. The problem can be resolved by the transparent soil experimental technique because transparent material with geotechnical properties similar to those of natural soils can be used to study deformation using non-intrusive optical visualization techniques. So the transparent soil will be adopted in the research as a substitute for natural sand. The proposed study will focus on the interface behavior of soil reinforced with denti-inclusions. Pullout tests are carried out o

英文关键词： reinforcement with denti-inclusion；interace behavior；3-D microstructure；mechanism；