堆石坝心墙土料填筑过程中素土填筑的压实度,一般认为同一碾压层内上部比下部土密实,这同土力学中关于土壤中的附加应力分布是一致的。但在堆石坝心墙填筑中,土料的压实情况并非仅仅如此,而是用核子密度仪发现了3种密实状况。文章应用土力学理论及其双重地基理论解释了产生这3种状况的原因,并经过多次碾压试验,得出几种常用土壤在碾压条件相同情况下达到密实度上下一致的较为合适的铺土厚度,希冀为类似工程的建设有所裨益。 It is generally considered that the upper part of the same roller compacted layer is denser than the lower part, which is consistent with the additional stress distribution in the soil mechanics. However, in the filling of core of rockfill dam, the compaction of soil material is not the only case, but the use of nuclear density meter found three kinds of compact conditions. In this paper, the reason of the three kinds of conditions is explained by the theory of soil mechanics and the theory of double foundation. After repeated rolling tests, it is found that several commonly used soils with the same rolling conditions have the same density The thickness of the soil is expected to benefit the construction of similar projects.