粗颗粒填土压实参数有效确定方法试验研究

Experimental Study on Effective Determination of Compaction Parameter for Coarse Grained Fill

为合理有效确定粗粒土压实参数的方法,针对目前仅采用最大干密度指标定量评价粗粒土压实质量存在的问题,提出在确定粗粒填土最大干密度时应考虑干密度离散性和填料非均质性。结合某填方工程,研究了碎石填料的干密度离散性和固体体积率,提出了该填料不同粗料含量的对应最大干密度推荐值和不同压实度对应固体体积率控制指标建议值,验证了考虑干密度的离散性和填料非均质性的必要性、合理性和工程实用性。

In order to determine compaction parameter of coarse grained soil reasonably and effectively, and in according to the issue existing in quantitative evaluation of its compaction quality by only using maximum dry density at present, This paper presents that discreteness of dry density and inhomogeneity of filling should be taken into account in definition of maximum dry density of coarse grained soil. Combining with a filling project, gravel fill＇s discreteness of dry density and solid volume rate are studied, and then the recommended values of both maximum dry density of this fill corresponding to different coarse soil contents and solid volume rate corresponding to different compactness are proposed. The necessity, rationality and practicability in engineering in respect of which discreteness of dry density and iuhomogeneity of filling should be taken into consideration are demonstrated.