包裹式加筋砂土边坡离心机试验研究与对比分析  

Centrifuge modelling of wrapped-reinforced sand slope and comparative analysis

作　　者：周健[1,2] 周韵鸿[1,2] 李飞 张姣[4] 

机构地区：[1]同济大学地下建筑与工程系,上海200092 [2]同济大学岩土及地下工程教育部重点实验室,上海200092 [3]中交第三航务工程勘察设计院有限公司,上海200032 [4]上海城市管理职业技术学院土木工程与交通学院,上海200092

出　　处：《岩土工程学报》2014年第3期555-561,共7页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学基金项目(41272296)

摘　　要：利用自主设计的宏细观可视化全程拍摄系统,对包裹式加筋砂土边坡进行了离心机模型试验。研究了20g离心场下包裹式加筋砂土边坡宏观变形模式和力学性状以及筋土界面处细观作用机理和土颗粒运动规律。将离心机试验结果与1g静力模型试验结果进行了对比,分析了不同应力场下加筋边坡变形破坏的宏细观机理。研究结果表明:不同应力场下包裹式加筋砂土边坡破坏模式不同,高应力状态下界面处摩擦咬合力峰值大于筋材拉伸断裂强度,而低应力状态下界面处筋材拉伸断裂强度大于摩擦咬合力峰值。筋土界面处不同的应力状态是影响筋土界面作用方式的重要因素。该研究对进一步认识包裹式加筋砂土边坡破坏机理有积极意义。Centrifuge tests on a geosynthetic-reinforced slope are performed to investigate its deformation modes, macroscopic mechanical properties and particle movement in the soil-geosynthetic interface. Through a comparison between the centrifugal test results at 20g and the static model test results, the macro-mesoscopic mechanism of the same size reinforced slope under different stresses is further analyzed. The results show that the wrapped-reinforced sand slope under different stresses has different failure modes. Under high stress state, the peak friction of the interface is greater than the tensile fracture strength of reinforcement materials. But under lower pressure, the tensile fracture strength of reinforcement materials is greater than the peak friction of the interface. Different stress states may significantly influence the interaction in the soil-geosynthetic interface. This study has a positive significance for further understanding the failure mechanism of the wrapped-reinforced sand slope.

关 键 词：包裹式加筋边坡 离心机试验 细观颗粒运动 宏细观机理 

分 类 号：TU411.93[建筑科学—岩土工程]