PHYSICAL AND MECHANICAL PROPERTIES OF MALAN LOESS AT ZHAOJIAAN LANDSLIDE AREA

LUO Hao; WU Faquan; WANG Dingwei; CHANG Jinyuan; BAO Han; XU Jiangbo; MA Aiyang

doi:10.13544/j.cnki.jeg.2015.01.007

Volume 23 Issue 1

Feb. 2015

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LUO Hao, WU Faquan, WANG Dingwei, CHANG Jinyuan, BAO Han, XU Jiangbo, MA Aiyang. 2015: PHYSICAL AND MECHANICAL PROPERTIES OF MALAN LOESS AT ZHAOJIAAN LANDSLIDE AREA. JOURNAL OF ENGINEERING GEOLOGY, 23(1): 44-51. doi: 10.13544/j.cnki.jeg.2015.01.007

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LUO Hao, WU Faquan, WANG Dingwei, CHANG Jinyuan, BAO Han, XU Jiangbo, MA Aiyang. 2015: PHYSICAL AND MECHANICAL PROPERTIES OF MALAN LOESS AT ZHAOJIAAN LANDSLIDE AREA. JOURNAL OF ENGINEERING GEOLOGY, 23(1): 44-51. doi: 10.13544/j.cnki.jeg.2015.01.007

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PHYSICAL AND MECHANICAL PROPERTIES OF MALAN LOESS AT ZHAOJIAAN LANDSLIDE AREA

doi: 10.13544/j.cnki.jeg.2015.01.007

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

Funds:

Received Date: 2013-11-27
Rev Recd Date: 2014-09-11
Publish Date: 2015-02-25

Abstract

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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