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作 者:赖汉江[1] 郑俊杰[1] 甘甜[1] 董友扣[1]
机构地区:[1]华中科技大学土木工程与力学学院,湖北武汉430074
出 处:《土木工程与管理学报》2012年第4期45-49,54,共6页Journal of Civil Engineering and Management
基 金:国家自然科学基金(50908112);教育部留学回国人员科研启动基金(20091341);山西省交通建设科技项目(11-2-17)
摘 要:筋材与填土界面摩擦特性直接影响加筋效果,其技术指标在工程设计中占重要地位。采用离散元法软件PFC2D,通过双轴试验和格栅拉伸试验确定土颗粒和格栅参数,建立了不同界面的加筋土拉拔试验模型,从细观角度对土工格栅与不同填土界面特性进行分析。试验结果表明:格栅上侧水平位移量比格栅下侧大;拉拔过程中格栅两侧的剪切带宽度不相等,格栅下侧剪切带宽度较大;不同形状颗粒间咬合嵌锁程度不同,咬合嵌锁程度越大,其水平位移量越小,剪切带宽度越大。The interface characteristics between geo-grid and soil have a significant influence on the performance of reinforcement and are very important in design.Based on the Discrete Element Method software PFC2D,the parameters of soil and geo-grid are obtained by the biaxial test and geo-grid tensile test.The microscopic properties of the interface are investigated through the pull-out tests in different cases.The results show that the horizontal displacement above the geo-grid is larger than that below the geo-grid.The widths of shear band both above and below the geo-grid are different,and the widths above the geo-grid are greater than that below the geo-grid.The effects of interlock between the geo-grid and particles with various shapes are different.As the interlock effects increase,the horizontal displacement reduces and the width of shear band increases.
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