高速公路路基压实低液限粉质黏土动力特性分析  

Dynamic Characteristics Analysis of Compacted Silty Clay with Low Liquid Limit in Highway Subgrade

作　　者：刘升传 蒋光远 LIU Shengchuan;JIANG Guangyuan(Research Institute of Highway Ministry of Transport,Beijing 100088,China;Xinjiang Beixin Road and Bridge Group Co.,Ltd.,Urumchi 830001,China)

机构地区：[1]交通运输部公路科学研究所,北京100088 [2]新疆北新路桥集团股份有限公司,乌鲁木齐830001

出　　处：《路基工程》2022年第4期69-76,共8页Subgrade Engineering

基　　金：中央级公益性科研院所基本科研业务费专项资金项目:典型季冻区高速公路新旧路基及粒料层差异变形机理研究(2019-0104)。

摘　　要：通过对压实度在95%的粉质黏土的室内动三轴试验,深入分析了重塑粉质黏土的动孔压的发展规律、动变形的变化规律、动强度参数和累积塑性变形,以掌握动应力、围压变化对动孔压的影响规律。研究表明:在实际路基工程中降低路基顶部动应力幅值,提高路基压实度和适当的边坡防护,可以有效地减小路基累积塑性变形和稳定。依据累积变形曲线可以判断低液限粉质黏土路基土在循环荷载作用下的稳定情况,可为路基本体在动荷载作用下的永久变形计算和预测提供参考。By the dynamic triaxial test of silty clay with 95%compacting degree,the development law of dynamic pore pressure,the change law of dynamic deformation,dynamic strength parameters and cumulative plastic deformation of remolded silty clay were deeply analyzed in order to understand the influence law of the change of dynamic stress and confining pressure on dynamic pore pressure.The research shows that the cumulative plastic deformation and stability of roadbed can be effectively reduced by reducing the amplitude of dynamic stress at the top of roadbed,increasing the compactness of roadbed and proper slope protection in practical roadbed engineering.The stability of silty clay subgrade with low liquid limit under cyclic load can be judged by the cumulative deformation curve,which can provide reference for calculation and prediction of permanent deformation of subgrade under dynamic load.

关 键 词：高速公路路基 低液限粉质黏土 动三轴试验 动强度 累积塑性变形 

分 类 号：U442[建筑科学—桥梁与隧道工程]