DCP快速检测土体压实性能的室内试验

为了评价动态圆锥贯入仪（DynamicConePenetrometer，简称DCP）快速检测土体压实性能的合理性，选取湖南省典型的红粘土填料，室内制作6种不同含水率和3种不同压实度的土体压实试件，采用DCP快速检测了土体贯入度．同时，还进行了PFWD动模量和浸水前后CBR对比试验．回归分析表明，贯入度与含水率和压实度之间呈显著的多元线性关系，而与动模量和CBR值之间具有良好的幂函数关系．在压实度相同的情况下，当含水率小于最佳含水率时，贯入度随含水率的增加呈线性减小；而当含水率大于最佳含水率时，贯入度随含水率的增加呈线性增加．在含水率相同的条件下，贯入度随压实度增加呈线性减小,因此，DCP测试结果与土体压实质量和力学性能之间存在良好的相关性，可应用于土基压实性能的快速检测和评价。

Laboratory experiment for rapid testing of soil compaction performance with DCP

In order to evaluate the rationality of rapid testing of soil compaction performance by using Dynamic Cone Penetrometer(DCP),the typical red-clay filler in Hunan Province was selected to make the soil compaction specimens with 6kinds of different moisture content and 3kinds of different compactness in the laboratory.The soil penetrations were rapidly tested with the DCP,and the PFWD dynamic moduli and the CBRs before and after soaking were also tested.The regression analysis show that there is a significant multivariate linear relation between penetrations and moisture contents with compactnesses,while there are the good power function relations between penetrations and dynamic moduli or CBRs.Among them,in the case of the same compactness,when the moisture content is smaller than the optimum moisture content,the penetration decreases linearly with the increase in the moisture content.On the contrary,when the moisture content is bigger than the optimum moisture content,the penetration increases linearly with the increase in the moisture content.In the case of the same moisture content,the penetration decreases linearly with the increase in the compactness.Therefore,there are good correlations between the tested results of DCP and the soil compaction qualities with the mechanical properties,and the DCP can be applied to the rapid testing and evaluation for the subgrade compaction performance.