间断级配粗粒土压实特性试验研究

于际都; 刘斯宏; 王涛; 魏浩

doi:10.11779/CJGE201911021

间断级配粗粒土压实特性试验研究 English Version

河海大学水利水电学院,江苏南京 210024

基金项目: 国家重点研发计划项目（2017YFC0404805）; 国家自然科学基金雅砻江联合基金重点项目（U1765205）; 国家自然科学基金项目（51979091）

详细信息

作者简介:
于际都(1996— ),男,硕士研究生,主要从事土石坝材料方面的研究。E-mail: yujidu@hhu.edu.cn。

通讯作者:
刘斯宏，E-mail：sihongliu@hhu.edu.cn

中图分类号: TU441
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出版历程
- 收稿日期: 2019-01-09
- 发布日期: 2019-11-24

Experimental research on compaction characteristics of gap-graded coarse-grained soils

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

摘要

摘要: 岩土工程中常遇到级配不连续的粗粒土,这类间断级配粗粒土的压实特性尚不清楚。通过开展室内压实试验,探究了影响间断级配粗粒土压实特性的主要因素。试验发现,间断级配与连续级配料相比,缺少d₃₀以下的粒径不利于压实,缺少中间粒径反而可能有利于压实。其干密度随基准级配分形维数D的增加而增大,并且D=2.5~2.7时压实性最好;随细料含量的增加先增后减,而最优细料含量与粗、细料单独堆积密度以及粗细颗粒堆积过程中的相互干扰程度有关。据此建立了间断级配粗粒土压实干密度的预测模型,通过少量压实试验即可得获得干密度与细料含量的关系曲线,从而得到最优细料含量和满足干密度要求的细料含量区间,可以较大程度上减少试验工作量。
- 间断级配 /
- 粗粒料 /
- 压实特性 /
- 干密度 /
- 分形维数 /
- 细料含量
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 d₃₀are 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.
- gap-gradation /
- coarse-grained soil /
- compaction characteristic /
- dry density /
- fractal dimension /
- mass content of fine-grained group

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