地基系数K30评价公路路基压实度研究

采用平板荷载法测量地基系数K₃₀，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K₃₀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K₃₀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K₃₀用于砂砾公路路基压实度的评定。

Research on Evaluation of Highway Subgrade Compaction by Foundation Coefficient K30

Herein plate loading method was used to measure foundation coefficient K₃₀. The linear regression analysis was carried out by use of the dry density ρ and 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 K₃₀ 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 K₃₀ 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 K₃₀, for the purpose of ensuring strength and deformation index of subgrade, to evaluate subgrade compactness of gravel highway.