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中文摘要：
为研究筋土界面细观结构演化及填料粒径对加筋效果的影响,采用＂clump＂方法开发了可模拟砂土性状的椭球形颗粒,建立三维离散元模型并结合室内试验结果验证了模型的正确性,系统分析了拉拔阻力、格栅应变、局部孔隙率等力学响应并揭示了其发展规律。拉拔试验结果显示大粒径填料置换后表观黏聚力提高显著而摩擦角变化不大,进行宏细观分析后发现,置换体系颗粒发生了更大程度的位置重排,拉拔力增量主要来源于摩擦阻力。研究成果可为从细观角度探究筋土界面机理提供新的认识。
英文摘要：
Aiming at studying the development of the microstructure in the interface and evaluating the reinforcement effect of the particle size,elliptical group particles are generated with the assistance of ＂clump ＂method to factually simulate the shape properties of sand particles.A three-dimensional DEM model is established,and its validity is verified by comparing the laboratory and numerical results.The mechanical responses such as pull-out resistance,strain of geogrid as well as local void ratio are systematically analyzed,and the laws of development are revealed.The results from the pull-out tests show that the apparent cohesion greatly increases,while the friction angle varies little after the original filler is partly replaced by coarse aggregate.The macro and micro analyses reveal that to a greater extent the positions of particles in the replacement systems chang and that the increment of total pull-out resistance is mainly attributed to the increase of friction resistance.The research results may provide a new understanding for the mechanism study of the reinforcement interface from a mesoscopic view.
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