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Volume 41 Issue 11
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YU Ji-du, LIU Si-hong, WANG Tao, WEI Hao. Experimental research on compaction characteristics of gap-graded coarse-grained soils[J]. Chinese Journal of Geotechnical Engineering, 2019, 41(11): 2142-2148. DOI: 10.11779/CJGE201911021
Citation: YU Ji-du, LIU Si-hong, WANG Tao, WEI Hao. Experimental research on compaction characteristics of gap-graded coarse-grained soils[J]. Chinese Journal of Geotechnical Engineering, 2019, 41(11): 2142-2148. DOI: 10.11779/CJGE201911021
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Experimental research on compaction characteristics of gap-graded coarse-grained soils

  • College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing 210024, China

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  • Received Date: January 09, 2019
  • Published Date: November 24, 2019
    Graphical Abstract
    • Abstract
  • The gap-graded coarse-grained soils are commonly encountered in geoengineering applications. However, their compaction characteristics remain unclear. By conducting a series of compaction tests, several influencing factors are studied. The test results show that compared with those with continuous gradation, the coarse-grained soils without grains sizing below d30 are less compactible, while the absence of grains sizing between d30 to d60 will increase their compactibility. The dry density of the gap-graded coarse-grained soils increases with the increase of the fractal dimension D of basic gradations, and the dry density reaches the maximum value when D=2.5~2.7. It is possible to achieve the largest dry density of the coarse-grained soils by selecting a reasonable mass content of fine-grained group. The optimal mass content of fine-grained group is related to the dry density of conarse-grained group, the dry density of fine-grained group and the interference between coarse and fine grains during the process of packing. Based on the experimental results, a model aiming to predict the dry density of gap-graded coarse-grained soils is established. Using the prediction model, the relation curve between dry density and mass content of fine-grained group can be obtained through a few compaction tests, and the optimal mass content of fine-grained group and the applicable mass content range of fine-grained group can be calculated, which can greatly reduce the test workload.
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    • References (22)
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