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.
出处
《岩土工程学报》
EI
CAS
CSCD
北大核心
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)
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
wrap-reinforced slope
centrifuge test
mesoscopic particle movement
macro-mesoscopic mechanism
