填土路基压实方法与环刀法取样深度中的误区

Correct Application of Subgrade Compaction Method and Reasonable Cutting Ring Sampling Depth

通过现场试验及理论分析 ,指出目前我国常用的路基填土压实方法———拖式振动凸块碾 +振动光轮压路机———由于机械配合的不当 ,因此不可能将 3 0cm填土层均匀碾压密实 ,每一填土层的层表近 5cm范围的压实度一般都达不到要求的密实度。而用环刀法检测压实度时恰好可以避过压实度不合格的范围 ,从而形成了每一层填土都合格的假象。这为日后的路面早期破坏问题留下隐患。为了解决这一问题 ,本文提出填土压实的改进方法和环刀法取样的合理深度 ,并通过现场试验和理论分析验证其可行性。

Through field experiments and theoretic analysis,the deficiencies of the combination of some compaction devices,such as sheepsfoots with rollers which are commonly used in PRC currently,have been found.The combination will not compact the top filling of about 5 centimeters of each layer of subgrade up required density The sampling depth with cutting ring to check the compactness may just miss the incompact range of each layer. This will give misleading information and cause early damage of the pavement.In order to avoid these problems,the author comes up with an improved method of compaction and sound sampling depth with site test and theoretical analysis.