砂土最大最小孔隙比测定及其影响因素分析

李珊珊; 李大勇; 高玉峰

doi:10.11779/CJGE201803021

砂土最大最小孔隙比测定及其影响因素分析 English Version

1. 山东科技大学土木工程与建筑学院,山东青岛 266590;
2. 福州大学土木工程学院,福建福州 350116;
3. 河海大学岩土工程科学研究所,江苏南京 210098

基金项目: 国家自然科学基金重点项目面上项目（51639002, 51379118）; 山东科技大学科研创新团队项目（2015TDJH104）

详细信息

作者简介:
李珊珊(1989-),女,博士研究生,主要从事岩土工程理论与应用研究。E-mail：shanshan3709@163.com。

通讯作者:
李大勇，E-mail：ldy@fuz.edu.cn

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出版历程
- 收稿日期: 2016-10-31
- 发布日期: 2018-03-24

Determination of maximum and minimum void ratios of sands and their influence factors

1. College of Civil Engineering and Architecture, Shandong University of Science and Technology, Qingdao 266590, China;
2. College of Civil Engineering, Fuzhou University, Fuzhou 350116, China;
3. Geotechnical Research Institute, Hohai University, Nanjing 210098, China

摘要

摘要: 相对密实度是影响砂土力学性质的重要指标,密实的砂土呈现强度软化,松散的砂土却呈现强度硬化,而测定最大、最小孔隙比是计算相对密实度的前提。砂土的最小及最大孔隙比是通过直接测定的相应最大、最小干密度换算得到的,但目前常忽略了试验方法对其试验结果的影响,也忽略了黏粒含量对砂样密实度的影响。现取细、中、粗砂3种砂样,进行了干密度测试试验并测定了不同黏粒及黏粒掺量下砂样的最大、最小孔隙比。研究结果表明：采用量筒慢转法测量砂土最小干密度较为合理;采用振动锤击法测定砂土最大干密度时,建议细砂采用容积为250 mL击实筒,中、粗砂采用1000 mL击实筒;掺入粉粒、黏粒后砂样的最小孔隙比均随黏粒掺量（≤30%）增加而减小,且两者之间存在一定的线性关系;砂样最大孔隙比随粉粒、黏粒掺量增加逐渐减小,而随高岭土黏粒掺量增加呈缓慢增大趋势。
- 砂土 /
- 最小孔隙比 /
- 最大孔隙比 /
- 干密度 /
- 相对密度 /
- 细粒含量 /
- 影响因素
Abstract: The mechanical behaviors of sand are heavily dependent on its relative density: the dense sand exhibits softening strength; on the contrary, the loose one displays hardening strength. Furthermore, the relative density is determined based on the maximum and minimum void ratios. The maximum and minimum void ratios are commonly obtained by using the maximum and minimum densities, ignoring the effects of test methods and clay contents in sand. The maximum and minimum void ratios are tested by considering three different sized groups of sands with various clay contents. It is shown that the minimum dry density can be attained in a measuring cylinder with low rotation speed. In addition, it is suggested that the maximum dry density of fine sands should be measured with the 250 mL compaction cylinder combining vibration with hit, while the 1000 mL compaction cylinder is suitable for medium and coarse sands. The results also show that the void ratio decreases with the increase in clay contents (less than 30%), while there is a linear relationship between the clay contents and the void ratio of sands. However, the maximum void ratio of sand decreases with increasing content of silty clay and clay, and increases with increasing content of kaolin clay.
- sand /
- minimum void ratio /
- maximum void ratio /
- dry density /
- relative density /
- fine particle content /
- influence factor

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参考文献(20)

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