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相对密度是砂性土的一项主要指标.关于相对密度的测试方法,1956年水利部批准的“土工试验操作规程”中,曾列入含粒径大于5mm颗粒试样相对密度的测试方法,规定最大干容重测定采用苏联的金属锤击与捣实联合测定法.此试验方法本身存在不少问题,试验结果很不规律,因而在1962年修改规程时,已将此法删去.规定粒径大于5mm颗粒含量小于3%的砂料,改为将大于5mm粒径颗粒筛除后,按不含粗颗粒料的试验方法进行,并不计粗颗粒的影响;对于粒径大于5mm颗粒含量在3～30%的砾质砂,用筛除粒
Relative density is a major indicator of sandy soil.For the test method of relative density, 1956 Ministry of Water Resources “Geotechnical Test Code of Practice”, has included the test method of the relative density of particles containing particles larger than 5mm, The provisions of the maximum dry bulk density using the Soviet Union’s metal hammering and tamping combined determination of the test method itself there are many problems, the test results are not regular, so in 1962 to amend the rules, this method has been deleted. Larger than 5mm particle size less than 3% of the sand material, instead of more than 5mm particle size sieve, according to the test method does not contain coarse particles, excluding the impact of coarse particles; particle size greater than 5mm in the particle content of 3 ~ 30% of the gravel sand, with the tablets removed tablets