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最大、最小干密度是评价砂土密实度的重要计算参数。通过钙质砂的最大、最小干密度试验,揭示了钙质砂颗粒破碎对最大干密度的影响,分析了最大、最小干密度随粒径和含水率的变化规律,并总结了钙质砂的最大、最小干密度的测试方法。研究表明,最大干密度随粒径的增大呈现先减小后增加的趋势;在最大干密度的测试中存在明显的颗粒破碎现象,使测试结果偏大;颗粒破碎量随粒径的增加先增加后减小,其中粗砂的破碎量最大;最小干密度随粒径的增大而减小,单一粒组钙质砂最小干密度的最大值仍然小于级配良好钙质砂的最小干密度,同一粒组的钙质砂的最小干密度随含水率的增大呈现出略有减小的趋势。建议钙质砂的最大干密度试验宜采用电动相对密度仪法,最小干密度试验宜采用量筒法。
The maximum and minimum dry density are important calculation parameters to evaluate the compaction of sand. Through the maximum and minimum dry density tests of calcareous sand, the influence of calcareous sand particles breaking on the maximum dry density was revealed. The variation rules of maximum and minimum dry density with particle size and moisture content were analyzed. Maximum, minimum dry density test method. The results show that the maximum dry density tends to decrease firstly and then increase with the increase of particle size. In the test of maximum dry density, there is a clear phenomenon of particle breakage, which leads to the large test result. The amount of particle breakage increases with the increase of particle size The maximum dry density decreases with the increase of particle size, the maximum dry density of single-group calcareous sand is still less than the minimum dry density of graded good calcareous sand , With the same group of calcareous sand minimum dry density showed a slight decrease with increasing moisture content. Proposed calcareous sand maximum dry density test should adopt the electric relative density meter method, the minimum dry density test should adopt the cylinder method.