地基系数K30评价公路路基压实度研究  

Research on Evaluation of Highway Subgrade Compaction by Foundation Coefficient K30

作　　者：黎卿 LI Qing(Zhuhai Institute of Urban Planning&Design,Zhuhai 519000,Guangdong,China)

机构地区：[1]珠海市规划设计研究院,广东珠海519000

出　　处：《路基工程》2020年第4期1-4,共4页Subgrade Engineering

基　　金：珠海市规划设计研究院科研项目(2018KY-ZT16)。

摘　　要：采用平板荷载法测量地基系数K 30,并与干密度ρ、车载式落锤弯沉仪(FWD)反算模量进行线性回归分析,相关系数R分别达到0.949和0.939,相关性均良好;进而采用地基系数K 30与灌砂法所测压实度K进行线性回归分析,相关系数R达到0.957,相关性较高。地基系数K 30能够直观地表征路基刚度和承载能力,且检测速度较灌砂法测压实度K更快,因而,为了保证路基的强度及变形指标,建议采用地基系数K 30用于砂砾公路路基压实度的评定。Herein plate loading method was used to measure foundation coefficient K 30.The linear regression analysis was carried out by use of the dry densityρand the back-calculated modular from car falling weight deflectometer(FWD),and the correlation coefficient R respectively reaches 0.949 and 0.939,showing good relevance;then the foundation coefficient K 30 and the compactness K measured by sand replacement method were further used for the linear regression analysis,and the correlation coefficient R reaches 0.957,showing high relevance.The foundation coefficient K 30 may directly manifest the stiffness and bearing capacity of subgrade and the testing speed is faster than the measurement of compactness K by sand replacement method.As a result,it is suggested to use foundation coefficient K 30,for the purpose of ensuring strength and deformation index of subgrade,to evaluate subgrade compactness of gravel highway.

关 键 词：平板荷载法 地基系数 压实度 干密度 FWD 

分 类 号：U416.1[交通运输工程—道路与铁道工程]