土工格栅拉拔试验与离散元数值模拟研究进展

Research Progress of Geogrid Pullout Tests and Discrete Element Modeling

为深入研究土工格栅的加筋机理,基于前人的研究成果,阐述拉拔试验中影响土工格栅与筋土界面特性的因素,介绍土工格栅和土体离散元建模以及拉拔荷载下筋土相互作用的可视化和量化分析结果,并提出有待深入研究的方向。研究表明:在试验研究方面,研究人员多采用传统试验方法,从试验边界条件、土工合成材料类型、土料类型及参数、加载条件等方面较为系统地研究各因素对筋土相互作用的影响;随着测试技术的发展,新型试验仪器可有效弥补传统测试方法的不足,并实现筋土界面作用分析的可视化。此外,离散元数值模拟是试验研究的重要补充,大量模拟结果可从细观层面更为深入地阐述筋土界面的作用机理。

In order to summarize the reinforcement mechanism of geogrid,based on the previous research results,this paper expounds the factors affecting the interface characteristics between Geogrid and soil in pull-out test,introduces the discrete element modeling of Geogrid and soil,and the visualization and quantitative analysis results of reinforcement-soil interaction under pull-out load,and puts forward the direction to be further studied.The summary results show that in the experimental research,researchers mostly use the traditional test methods to systematically study the influence of various factors on the interaction between reinforcement and soil from the aspects of test boundary conditions,geosynthetics types,soil material types and parameters,loading conditions and so on.With the development of test technology,the new test instrument effectively makes up for the shortcomings of traditional test methods and realizes the visualization of reinforcement soil interface analysis.In addition,discrete element numerical simulation is an important supplement to experimental research.A large number of simulation results further elaborate the action mechanism of reinforcement soil interface from the meso level.This study deeply summarizes the interaction mechanism between geogrid and soil under pull-out load from the aspects of test and discrete element numerical simulation.The relevant research results can enhance researchers’understanding of reinforcement soil interaction and provide some reference for optimizing and perfecting relevant test methods.