路基振动压实过程中振动波传播规律  

Propagation Laws of Vibration Waves During Process of Subgrade Vibration Compaction

作　　者：苏珂 蔡德钩 马洪生 闫宏业 于佳琪 程素明 SU Ke;CAI Degou;MA Hongsheng;YAN Hongye;YU Jiaqi;CHENG Suming(Postgraduate Department,China Academy of Railway Sciences,Beijing 100081,China;Railway Engineering Research Institute,China Academy of Railway Sciences Corporation Limited,Beijing 100081,China;Sichuan Highway Planning,Survey,Design and Research Institute Co.Ltd.,Chengdu 610041,China;School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China;Chengdu Branch of China Railway No.3 Engineering Group Co.Ltd.,Chengdu 610031,China)

机构地区：[1]中国铁道科学研究院研究生部,北京100081 [2]中国铁道科学研究院集团有限公司铁道建筑研究所,北京100081 [3]四川省公路规划勘察设计研究院有限公司,成都610041 [4]西南交通大学土木工程学院,成都610031 [5]中铁三局集团有限公司成都分公司,成都610031

出　　处：《铁道建筑》2023年第7期129-133,共5页Railway Engineering

摘　　要：通过有限元软件建立考虑阻尼比、弹塑性本构关系的振动压路机-填料耦合数值仿真模型,得到振动压实过程中振动压路机及填料动力响应曲线,探究振动压实过程中振动波垂直及水平方向传播规律,提出了基于振动波的填料压实质量综合判别方法。结果表明:结合现场实测振动压路机及填料动力响应曲线,振动压路机-填料耦合模型能够较好地模拟填料振动压实过程;在垂直方向,加速度幅值的衰减呈现先快后慢的趋势,且在填料深度为0.5 m时衰减率达60%,路基深度为1.5 m时衰减率达90%;在填料表层水平方向,已压实土体与虚铺土体距压实作用点分别为0.8、0.5 m处,峰值衰减率均达90%;提出了基于振动波传播衰减率降低、动响应幅值增加与归一化动响应滞回圈的椭圆率增加的填料压实质量综合直接判别方法。Through finite element software,a numerical simulation model of vibrating roller filler coupling considering damping ratio and elastic-plastic constitutive law was established,and the dynamic response curves of the vibrating roller and filler during the vibration compaction process were obtained.The vertical and horizontal propagation laws of vibration waves during the vibration compaction process were explored,and the comprehensive judgment method for filling compaction quality based on vibration waves was proposed.The results show that,combined with the on-site measurement of the dynamic response curves of the vibrating roller and the filling material,the coupling model of the vibrating roller and the filling material can effectively simulate the vibration compaction process of the filling material.In the vertical direction,the attenuation of acceleration amplitude shows a trend of first fast and then slow,and the attenuation rate reaches 60%when the filling depth is 0.5 m,and 90%when the subgrade depth is 1.5 m.In the horizontal direction of the filling surface,the compacted soil and the virtual laid soil are located at a distance of 0.8 and 0.5 meters from the compaction point,respectively,with a peak attenuation rate of 90%.A comprehensive direct identification method for filling compaction quality was proposed based on the reduction of vibration wave propagation attenuation rate,increase of dynamic response amplitude,and increase of ellipticity of normalized dynamic response hysteresis loop.

关 键 词：路基 振动压实 数值模拟 现场测试 压实质量 动力响应 加速度峰值 

分 类 号：U213.1[交通运输工程—道路与铁道工程]