原状和压实黄土持水特性及湿陷性对比试验研究

穆青翼; 党影杰; 董琪; 廖红建; 董欢

doi:10.11779/CJGE201908014

原状和压实黄土持水特性及湿陷性对比试验研究 English Version

穆青翼¹,
党影杰¹,
董琪^2,3,
廖红建^1,4, ,,
董欢¹

1. 西安交通大学人居环境与建筑工程学院,陕西西安 710049;
2. 西安交通大学机械结构强度与振动国家重点实验室,陕西西安 710049;
3. 陕西科技控股集团有限责任公司,陕西西安 710003;
4. 长安大学西部矿产资源与地质工程教育部重点实验室,陕西西安 710054

基金项目: 国家自然科学基金项目（51879212,41630639）; 西部矿产资源与地质工程教育部重点实验室开放基金项目（310826171107）; 中国博士后科学基金项目（2018M631166）

详细信息

作者简介:
穆青翼(1988— ),男,博士,讲师,主要从事非饱和土力学和环境岩土工程等方面的教学和科研工作。E-mail: qingyimu@mail.xjtu.edu.cn。

通讯作者:
廖红建，E-mail：hjliao@mail.xjtu.edu.cn

中图分类号: TU43
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- 文章访问数: 327
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出版历程
- 收稿日期: 2018-07-31
- 发布日期: 2019-08-24

Water-retention characteristics and collapsibity behaviors: comparison between intact and compacted loesses

1. School of Human Settlement and Civil Engineering, Xi'an Jiaotong University, Xi'an 710049, China;
2. State Key Laboratory for Strength and Vibration of Mechanical Structures, Xi'an Jiaotong University, Xi'an 710049, China;
3. Shaanxi Science and Technology Holding Group, Xi'an 710003, China;
4. Key Laboratory of Western Mineral Resources and Geological Engineering, Ministry of Education, Chang'an University, Xi'an 710054, China

摘要

摘要: 通过对比研究具有相同初始干密度和含水率的原状和压实黄土,揭示黄土结构对其持水特性和湿陷性影响。利用扫描电镜观察原状和压实黄土微观结构,对试验结果辅助分析。研究显示：压实黄土持水特征曲线进气值较原状黄土大75%。这可能是由于原状黄土中存在超大团粒间孔隙,造成显著的瓶颈效应。另外,原状黄土持水特征曲线的滞回度在低吸力范围（小于7 kPa）较压实黄土大,而在中间吸力范围（7~80 kPa）较压实黄土小。这是由于原状和压实黄土经历不同脱—吸湿历史。对于湿陷性,高含水率时（大于18%）原状和压实黄土湿陷系数差别不大,而在低含水率（16%）时,原状黄土湿陷系数大于压实黄土。这是由于原状黄土中存在黏土颗粒胶结,使其具有较大抵抗加载变形能力（竖向应力200 kPa）。随后的注水,导致黏土颗粒胶结作用失效,引起较大湿陷变形。此外,原状黄土屈服应力较压实黄土屈服应力增大的程度随含水率减小而显著增加,这说明了原状黄土的结构性随含水率的降低而显著增强。
- 原状黄土 /
- 压实黄土 /
- 持水特性 /
- 湿陷性
Abstract: The compacted and intact loesses with the same dry density and water content are tested to investigate the structural effects on the water-retention characteristics and collapsibility behaviors of loess. The scanning electron microscopy (SEM) tests are carried out to assist in the interpretation of test results. It is found that the air entry value of the intact loess is 75% smaller than that of the compacted loess. This is likely because that the extra-large pores in the intact loess result in pronounced ink-bottle effects. The water-retention curve of the intact loess exhibits larger and smaller hysteresis than that of the compacted loess at suctions ranging from 0.1 to 7 kPa and from 7 to 80 kPa, respectively. This can be explained by the different wetting-drying history experienced by intact and compacted loesses. Similar collapsibility potential is observed for the intact and compacted loesses with high water contents (>18%), whereas the wetting-induced collapsibility of the intact loess is larger than that of the compacted loess with low water content (16%). This is because that the clay bonding in the intact loess results in a more resistant structure. This resistant structure assists in the intact loess to maintain large void ratios during mechanical loading (200 kPa). During soaking, clay bonding is destroyed and significant collapse is induced. In addition, the differences in the yield stress between the intact and compacted loesses increase with the decreasing water content. It is indicated that the resistant structure of the intact loess is enhanced with the decrease of the water content.
- intact loess /
- compact loess /
- water retention characteristic /
- collapsibility

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