密实度对格栅-再生混凝土骨料界面剪切特性的影响  

Influence of Density on Geogrid-Recycled Concrete Aggregate Interfacial Shear Characteristics

作　　者：吴建奇[1] 李敏[1] 罗翔[1] 陈腾 WU Jianqi;LI Min;LUO Xiang;CHEN Teng(Jiangxi Provincial Key Laboratory of Environmental Geotechnical and Engineering Disaster Control,School of Civil and Surveying&Mapping Engineering,Jiangxi University of Science and Technology,Ganzhou 341000,Jiangxi,China)

机构地区：[1]江西理工大学土木与测绘工程学院、江西省环境岩土与工程灾害重点实验室,江西赣州341000

出　　处：《路基工程》2024年第5期84-90,共7页Subgrade Engineering

基　　金：国家自然科学基金(51768025)。

摘　　要：为探究相对密实度、颗粒级配及法向应力等因素对格栅-再生混凝土骨料界面剪切特性的影响,通过大型直剪仪对不同相对密实度的再生混凝土骨料进行单调直剪试验。结果表明:在不同相对密实度、颗粒级配、法向应力影响因素下,界面均呈现出峰值后剪切软化现象;相对密实度对界面剪切特性有显著影响,随着相对密实度的增大,界面抗剪强度、剪切模量、似黏聚力、内摩擦角及整体剪胀量均呈现增大趋势;随着不均匀系数的增大,界面峰值抗剪强度与残余抗剪强度均增大,剪胀现象明显;界面峰值抗剪强度随法向应力的增加近似线性增长,增加幅值、剪胀量随法向应力的增大呈现减小趋势。Monotonic direct shear tests were carried out on recycled concrete aggregate in different relative density with large direct shear apparatus to explore the influences of relative density,grain grading,normal stress and other factors on geogrid-recycled concrete aggregate interfacial shear characteristics.The result shows that,under the influences of different relative density,grain grading,normal stress,there presents post-peak shear softening on the interface;relative density has significant influence on the interfacial shear characteristics and,with the increase of relative density,all of the shear strength,shear modulus,pseudo-cohesion,internal friction angle,and overall shear dilatancy show an increasing trend;with the increase of nonuniform coefficient,both the peak shear strength and residual shear strength on the interface increase,showing obvious shear dilatation;with the increase of normal stress,the interfacial peak shear strength increases approximately in a line,and the increased amplitude and the shear dilatancy show a decreasing trend.

关 键 词：再生混凝土骨料 界面剪切特性 相对密实度 颗粒级配 抗剪强度 

分 类 号：TU433[建筑科学—岩土工程]