IN-SITU DIRECT SHEARING TEST ON LANDSLIDE ACCUMULATION BODY INTENSITY OF WENCHUAN EARTHQUAKE REGION

WU Rui-an; ZHANG Yong-shuang; WANG Xian-li; YAO Xin; YANG Zhi-hua; DU Guo-liang

2017 Vol. 23, No. 1

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Article navigation > Journal of Geomechanics > 2017 > 23(1): 105-114

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WU Rui-an, ZHANG Yong-shuang, WANG Xian-li, YAO Xin, YANG Zhi-hua, DU Guo-liang. IN-SITU DIRECT SHEARING TEST ON LANDSLIDE ACCUMULATION BODY INTENSITY OF WENCHUAN EARTHQUAKE REGION[J]. Journal of Geomechanics, 2017, 23(1): 105-114.

Citation:

IN-SITU DIRECT SHEARING TEST ON LANDSLIDE ACCUMULATION BODY INTENSITY OF WENCHUAN EARTHQUAKE REGION

1.
Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China
2.
Key Laboratory of Neotectonic Movement and Geohazard, Ministry of Land and Resourses, Beijing 100081, China
3.
Sichuan Provincial Chuanjian Investigation and Design Institute, Chengdu 610017, China

More Information

Corresponding author: ZHANG Yong-shuang, zhys100@sohu.com

Received Date: 14 June 2016

Publish Date: 25 February 2017

Abstract

Abstract

In this paper, the earthquake-induced loose sediments near Xuankou, Wenchuan County, Sichuan province are selected to conduct the in-situ direct shear tests of undisturbed gravel soil and remolded soil sample direct shear tests with different situations to explore the shear properties of gravel soils under different vertical pressure, particle size composition and moisture. The study results show that (1) Gravel soils which have similar geological genesis, similar rock mass structure, different size composition and poor gradation have similar shear properties and shear strength. (2) The shear strength of undisturbed gravel soil samples is significantly higher than remolded samples with the same dry density and moisture. (3) Strain hardening strength of well-graded gravel soils is slightly higher than bad-graded gravel soil, when the content of coarse particle whose size is greater than 5 mm is more than 42.9%, friction angle increases with increment of coarse-grained contents, while cohesion decreases firstly and then increases. (4) When moisture content is more than 15.8%, there is a negative correlation between shear strength indexes and moisture content, with gradual increase of moisture, the shear strength of gravel soil will gradually reduce, among which the decrease of cohesion is more remarkable than internal friction angle. Considering others' research and experimental results, we suggest that the gravel soils having similar structure components in Wenchuan earthquake area can select the shear strength indexes c of 15±3kPa and Phi of 30°±2°.
- Wenchuan earthquake /
- landslide accumulation body /
- shear strength /
- in-situ test /
- slope stability

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References

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