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Liquefaction of loess landslides as a consequence of irrigation

Peng Jianbing, Zhuang Jianqi, Gonghui Wang, Dai Fuchu, Zhang Fanyu, Huang Weiliang and Xu Qiang
Liquefaction of loess landslides as a consequence of irrigation
Quarterly Journal of Engineering Geology and Hydrogeology (March 2018) 51 (3): 330-337

Abstract

Most landslides on the Loess Tableland (Shaanxi, China) are of the sliding-flow type, with long run-out distances. These landslides, which tend to be triggered by irrigation, result in loss of life and damage to infrastructure. In order to reveal the characteristics and mechanisms of sliding-flow landslides, field investigations, surveys and indoor tests, including consolidated undrained triaxial tests and ring-shear tests, were conducted. The apparent friction of sliding-flow loess landslides triggered by irrigation in the study area ranged from 0.01 to 0.25, with a mean of 0.159. These values are lower than those associated with the landslides triggered by the Wenchuan Earthquake. The deviation stress decreased to about 99% of its peak value, while the path of the effective stress revealed that the effective normal stress approached zero. Consequently, saturated loess samples were highly liquefiable under consolidated undrained triaxial tests. The pore pressures increased sharply and up to their peak value (mean of 130 kPa), corresponding to 92% of the applied normal stress. The path of effective stress did not reach the failure line. The loose structure and macro-pore content of loess provide the framework for static liquefaction to occur as a consequence of the generation of fine particles.


ISSN: 1470-9236
EISSN: 2041-4803
Serial Title: Quarterly Journal of Engineering Geology and Hydrogeology
Serial Volume: 51
Serial Issue: 3
Title: Liquefaction of loess landslides as a consequence of irrigation
Affiliation: Chang'an University, College of Geological Engineering, Mineral Resources and Geological Engineering, Xian, China
Pages: 330-337
Published: 20180323
Text Language: English
Publisher: Geological Society of London, London, United Kingdom
References: 34
Accession Number: 2018-032323
Categories: Engineering geology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table, geol. sketch maps
N31°40'00" - N39°30'00", E106°00'00" - E111°19'60"
Secondary Affiliation: State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, CHN, ChinaKyoto University, JPN, JapanBeijing University of Technology, CHN, ChinaLanzhou University, CHN, China
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2018, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data from The Geological Society, London, London, United Kingdom
Update Code: 201817
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