浅析影响土的击实试验的主要因素

Factors Affecting the Laboratory Compaction Test Results

影响室内击实试验结果的因素有很多,有试样的制备方法、击实标准、击实功能、土的含水量、余土高度、土的颗粒级配、有机质含量等。分析了土的种类、含水量、颗粒级配及有机质等土的性质因素对试验结果的影响,也分析了试样制备方法、击实功能、余土高度及重复使用土样等试验过程因素对试验结果的影响。研究表明:试验建议采用风干土;需要严格限制余土高度在6 mm以内;土的颗粒级配是影响结果的重要因素。通过对这些影响因素的分析与探讨,来提高土的击实效果,从而达到击实试验为实际工程服务的目的。

There are many factors affecting the results of laboratory compaction test,such as,sample preparation methods,compaction standard applied,compactive energy applied,soil moisture contents,height of residual soil in the container,particle size distribution,organic content in the sample,etc.The influence of soil types,moisture content,particle size distribution and organic matter on the test results is evaluated in this paper.The influence factors in the test procedures,such as sample preparation methods,compactive energy,residual soil height in the container and repetitive use of soil samples,are also analyzed in detail.The following conclusions could be drawn based on the evaluation results:Oven dried soils are recommended in the compaction tests.The height of residual soil should be strictly limited within 6 mm.The particle size distribution is an important factor.Through the analysis and discussion of these factors,the soil compaction results can be improved.