单点击实法击实试验研究

在国内现行的各类土工试验规程中，5点击实法是最基本的土工击实试验方法，具有用土量大、费时、费力，而且试验数据处理麻烦等缺陷。为了克服这些缺陷，采用静压脱湿试验法，对人工配制含水率，而且含水率高于该土的塑限含水率的不同土样进行脱湿。试验结果表明：各土样脱湿后的含水率具有稳定在标准击实功下该土最优含水率以下某一稳定水平的特点。由此提出：可将需要击实的土样先脱湿，得出土样脱湿后的含水率，再乘以有关系数求得土的最优含水率，直接对最优含水率下的土体进行标准击实功单点击实，从而快速准确地获得该土的最优含水率和最大干密度。通过对比试验验证，单点击实法不但简单、快速，而且具有足够的可靠性。

Research on compaction test of single compaction method

Currently,in China,compaction test with five-point method is the most basic earthwork test in the various specifications of soil test.The test has some drawbacks such as needing much more test soil and test time,great effort and meeting trouble in data processing.In order to overcome these shortcomings,different soil samples being prepared is dehydrated under the conditions of the timing constant pressure that its moisture content is higher than its plastic limit water content.There is a law that the moisture content after being dehydrated was stable,it is always lower than the optimum water content under standard compaction work.Based on the characteristic,optimum moisture content of the soil could be calculated by dehydrated moisture content and the correlation coefficient multiplied.Soil optimum moisture content and maximum dry density under standard compaction work could be obtained quickly and accurately using single-compaction method.After improving the method of compaction test,it is simple,fast and reliable comparing with the five-point method.