赵家岸滑坡地区马兰黄土物理力学特性试验研究

罗浩; 伍法权; 王定伟; 常金源; 包含; 许江波; 马艾阳

doi:10.13544/j.cnki.jeg.2015.01.007

赵家岸滑坡地区马兰黄土物理力学特性试验研究

doi: 10.13544/j.cnki.jeg.2015.01.007

1.
中国地震局地质研究所, 活动构造与火山重点实验室北京 100029;
2.
中国科学院地质与地球物理研究所, 中国科学院页岩气与地质工程重点实验室北京 100029;
3.
中冶集团武汉勘察研究院有限公司武汉 430080;
4.
绍兴文理学院, 土木工程学院绍兴 312000;
5.
长安大学公路学院西安 710064

基金项目:

中国地质调查局工作项目(1212011140001, 12120113007700)资助

详细信息

作者简介:
罗浩(1980-),男,博士,主要从事活动构造、地质灾害方面的工作. Email: hy-luo@163.com

中图分类号: P642
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出版历程
- 收稿日期: 2013-11-27
- 修回日期: 2014-09-11
- 刊出日期: 2015-02-25

PHYSICAL AND MECHANICAL PROPERTIES OF MALAN LOESS AT ZHAOJIAAN LANDSLIDE AREA

1.
Key Laboraory of ActiveTectonics and Volcano, Institute of Geology, China Earthquake Administration, Beijing 100029;
2.
Key Laboratory of Shale Gas and Geoengineering, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029;
3.
Wuhan Surveying-Geotechnical Research Insititute Co., Ltd. of MCC, Wuhan 430080;
4.
College of Civil Engineering, Shaoxing University, Shaoxing 312000;
5.
School of Highway, Chang'an University, Xi'an 710064

摘要

摘要: 浸水或增湿过程中,黄土特有的不稳定结构极易发生破坏,约束黄土的力学行为特征.通过粒度分析、扫描电镜和压汞实验对赵家岸滑坡地区黄土的微观结构进行分析,得到由上到下黏土的胶结作用升高,架空孔隙压缩明显,小孔隙几乎没有变化的特征.不同初始含水量条件下三轴压缩实验显示该区的顶部和底部黄土的强度均随初始含水量的增大而减小.由于底部黄土黏土胶结作用较高,黄土的强度减小速率大于顶部黄土.同时发现c值对于水的敏感性明显大于值,强度的降低主要是c值的减小导致.由于地下水位的升高,滑坡底部黄土的含水量增加,颗粒之间主要承担胶结作用的黏土矿物软化,导致附近的黄土微观结构持续破坏,导致赵家岸滑坡发生蠕动.
- 含水量 /
- 微观结构 /
- 极限强度 /
- 赵家岸滑坡 /
- 马兰黄土
Abstract: Inundating or humidifying process can easily destroy the distinct metastable structure of loess and control its mechanical behavior. This paper analyzes the microstructure of Malan loess at Zhaojiaan landslide area. It uses grain size analysis, scanning electron microscope, and mercury intrusion porosimetry. The results demonstrate that as the loess depth increases from surface to deep, the cementation of clay mineral is increasing gradually, the trellis pores is compressed obviously, and micro-pore is unchanged nearly. Triaxial compression test on loess with different initial water content shows that the strength of loess at top and bottom location decreases with increasing in water content. Since the loess at bottom location has higher clay cementation, its strength is larger than that at top. The cohesion strength parameter c is much more sensitive to water than the internal frictional angle . Therefore the strength reduction with depth is caused primarily by the decreasing of c. Water content increasing of loess at the bottom due to rising of ground water level can cause the parts of clay mineral to soften, undermine the cementation between particles, and continuously destruct the microstructure of loess, which resulted in wriggles of Zhaojiaan landslide.
- Water content /
- Microstructure /
- Ultimate strength /
- Zhaojiaan landslide /
- Malan loess

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