A data set of the coefficient of vertical subgrade reaction for a plate diameter of 30 cm, K_P.FWD, measured by Portable Falling Weight Deflectometer tests in full-scale compaction tests on sandy soil using various types of compaction machines was analysed. Based on this analysis and the previous analysis of a CBR data set from another full-scale compaction test series, a set of conclusions could be drawn. The soil stiffness indexes (SSIs), CBR and K_P.FWD, can be expressed by, respectively, an empirical equation multiplying a function of ρ_d and another of S_r, where CBR and K_P.FWD decrease significantly as S_r increases. As such, ρ_d values cannot be estimated from SSI alone. By fixing the field ρ_d – w compaction curve by keeping the soil type and the field compaction energy level, CEL_f, to those in the field compaction tests in which the SSI – ρ_d – S_r correlation has been calibrated, field compacted ρ_d & w states can be estimated by measuring the SSI values. Then, by the upper-bound and lower-bound control of SSI, the field compacted states approach the specified target, where, typically, ρ_d = the maximum dry density for CEL_f and S_r = the optimum degree of saturation, (S_r)_opt. A method to incorporate this indirect but fast SSI-based compaction control into the conventional ρ_d & w-based compaction control is proposed.

分析了通过便携式落锤_挠度计测试在使用各种类型的压实机对沙质土壤进行全尺寸压实测试中测量的 30 cm 板直径的垂直路基反应系数数据集K _P.FWD。基于此分析和之前对来自另一个全尺寸压实测试系列的CBR数据集的分析，可以得出一组结论。土壤刚度指数（的SSI），CBR和ķ _P.FWD，可以通过，表示分别的经验方程乘以ρ的函数_d和另一个的小号_{- [R} ，其中CBR和ķ_P.FWD随着S _{r 的}增加而显着降低。因此，不能仅从SSI估计ρ _d值。通过将土壤类型和现场压实能量水平CEL _{f 固定}到现场压实测试中的那些，其中SSI – ρ _d – S _r相关性已被校准，现场压实 ρ通过固定现场 ρ _d – w压实曲线_d & w状态可以通过测量SSI值来估计。然后，通过SSI的上下限控制，现场压实状态接近指定目标，其中，通常，ρ _d  = CEL _f的最大干密度，S _r  = 最佳饱和度，( S _r ) _opt。提出了一种将这种间接但快速的基于SSI的压实控制结合到传统的基于ρ _d & w的压实控制中的方法。