Characteristics and lessons of liquefaction-triggered large-scale flow slide in loess deposit during Jishishan M6.2 earthquake in 2023

WANG Lanmin; XU Shiyang; WANG Ping; WANG Rui; CHE Ailan; ZHOU Yanguo; WU Zhijian; WANG Qian; PU Xiaowu; CHAI Shaofeng; MA Xingyu

doi:10.11779/CJGE20240038

Volume 46 Issue 2

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Chinese Journal of Geotechnical Engineering > 2024 > 46(2): 235-243. > DOI: 10.11779/CJGE20240038

WANG Lanmin, XU Shiyang, WANG Ping, WANG Rui, CHE Ailan, ZHOU Yanguo, WU Zhijian, WANG Qian, PU Xiaowu, CHAI Shaofeng, MA Xingyu. Characteristics and lessons of liquefaction-triggered large-scale flow slide in loess deposit during Jishishan M6.2 earthquake in 2023[J]. Chinese Journal of Geotechnical Engineering, 2024, 46(2): 235-243. DOI: 10.11779/CJGE20240038

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Characteristics and lessons of liquefaction-triggered large-scale flow slide in loess deposit during Jishishan M6.2 earthquake in 2023

1.
Key Laboratory of Loess Earthquake Engineering of China Earthquake Administration & Gansu Province, Lanzhou 730000, China
2.
School of Civil Engineering, Tsinghua University, Beijing 100084, China
3.
School of Naval Architecture, Ocean & Civil Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
4.
Institute of Geotechnical Engineering, Center for Hyper Gravity Experiment and Interdisciplinary Research, Zhejiang University, Hangzhou 310058, China
5.
College of Transportation Science & Engineering, Nanjing Tech University, Nanjing 211816, China
6.
Key Laboratory of Earthquake Engineering and Engineering Vibration of China Earthquake Administration, Institute of Engineering Mechanics, China Earthquake Administration, Harbin150080, China

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Received Date: January 11, 2024
Available Online: February 05, 2024

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Abstract

At 23:59 of December 18, 2023, a strong earthquake with a magnitude of M6.2 with a focal depth of 10 km struck Jishishan County in Gansu Province, China. The epicenter is located at N35.7° and E102.79°. A large-scale liquefaction-triggered flow slide in loess deposit on the secondary terrace with a gentle slope of 2°~3.5° of the Yellow River was induced by the earthquake, where is about 20 km away from the epicenter. The flow slide developed into a devastating mudflow to buried 51 houses in two villages of Jintian and Caotan, Qinghai Province and caused 20 people dead. A joint field investigation was carried out on the flow slide immediately after the earthquake. Based on the site reconnaissance, UAV survey, borehole exploration, electrical prospecting and analyses on both ground motion and the previous research achievements in liquefaction-triggered flow slides in loess deposit, the characteristics and mechanism of the large-scale flow slide are clarified preliminarily. The results show that the flow slide in loess deposit is triggered by the liquefaction in a large area of saturated loess layer below 11 m, the overburden soil mass slides into a gully with liquefied loess together along the liquefied layer in the direction of the gentle slope. And then, the mixture mass of soil and water continues moving down along the gully with a gradient of 1.5°~5°. During the flow sliding, stirring and rubbing each other continuously of the large amount of water gushes from the liquefied soil mass and the overburden soil has made its mixture to develop into a mud flow before the mixture arrives at a dam in the downstream of the gully. After meeting the dam, the mudflow overflows the banks at both sides, and at the same time, turns into the other neighbor gully at the left side for about a certain distance. Finally, the dam breaks and the mudflow moves down again along the gully, passes the two villages, and stops in a large area of farmland 317 m away from the villages. The lessons learned from the disaster are expounded for its risk assessment, mitigation and prevention.
- liquefaction,
- flow slide,
- loess deposit,
- ground motion,
- amplification

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References

[1]	WANG L M, WU Z J, XIA K, et al. Amplification of thickness and topography of loess deposit on seismic ground motion and its seismic design methods[J]. Soil Dynamics and Earthquake Engineering, 2019, 126: 105090. doi: 10.1016/j.soildyn.2018.02.021
[2]	白铭学, 张苏民. 高烈度地震时黄土地层的液化移动[J]. 工程勘察, 1990, 18(6): 1-5. BAI Mingxue, ZHANG Sumin. Landslide induced by liquefaction of loessial soil during earthquake of high intensity[J]. Geotechnical Investigation and Surveying, 1990, 18(6): 1-5. (in Chinese)
[3]	王兰民. 黄土动力学[M]. 北京: 地震出版社, 2003. WANG Lanmin. Loess Dynamics[M]. Beijing: Seismological Press, 2003. (in Chinese)
[4]	WANG L M, ZHANG Z, LI L, et al. Laboratory study on loess liquefaction[C]// The Proceedings of Eleventh World Conference on Earthquake Engineering, Alcapulco, 1996.
[5]	王兰民. 黄土地层大规模地震液化滑移的机理与风险评估[J]. 岩土工程学报, 2020, 42(1): 1-19. doi: 10.11779/CJGE202001001 WANG Lanmin. Mechanism and risk evaluation of sliding flow triggered by liquefaction of loess deposit during earthquakes[J]. Chinese Journal of Geotechnical Engineering, 2020, 42(1): 1-19. (in Chinese) doi: 10.11779/CJGE202001001
[6]	赵晋泉, 张大卫, 高树义, 等. 1303年山西洪洞8级大地震郇堡地滑之研究[J]. 山西地震, 2003(3): 17-23. ZHAO Jinquan, ZHANG Dawei, GAO Shuyi, et al. Huanbu ground slide, the relic of 1303 Hongtong, Shanxi, earthquake of M8[J]. Earthquake Research in Shanxi, 2003(3): 17-23. (in Chinese)
[7]	王兰民, 柴少峰, 薄景山, 等. 黄土地震滑坡的触发类型、特征与成灾机制[J]. 岩土工程学报, 2023, 45(8): 1543-1554. doi: 10.11779/CJGE20220531 WANG Lanmin, CHAI Shaofeng, BO Jingshan, et al. Triggering types, characteristics and disaster mechanism of seismic loess landslides[J]. Chinese Journal of Geotechnical Engineering, 2023, 45(8): 1543-1554. (in Chinese) doi: 10.11779/CJGE20220531
[8]	ISHIHARA K, OKUSA S, OYAGI N, et al. Liquefaction-induced flow slide in the collapsible loess deposit in soviet Tajik[J]. Soils and Foundations, 1990, 30(4): 73-89. doi: 10.3208/sandf1972.30.4_73
[9]	王钟琦, 谢君斐, 石兆吉. 地震工程地质导论[M]. 北京: 地震出版社, 1983. WANG Zhongqi, XIE Junfei, SHI Zhaoji. Introduction to Earthquake Engineering Geology[M]. Beijing: Seismological Press, 1983. (in Chinese)
[10]	陈文化. 地震液化流滑震害[J]. 自然灾害学报, 2001, 10(4): 88-93. CHEN Wenhua. Slipping disaster induced by seismic liquefaction[J]. Journal of Natural Disasters, 2001, 10(4): 88-93. (in Chinese)
[11]	ZHANG J M, WANG G. Large post-liquefaction deformation of sand, part Ⅰ: physical mechanism, constitutive description and numerical algorithm[J]. Acta Geotechnica, 2012, 7(2): 69-113.
[12]	张建民. 砂土动力学若干基本理论探究[J]. 岩土工程学报, 2012, 34(1): 1-50. http://cge.nhri.cn/cn/article/id/14487 ZHANG Jianmin. New advances in basic theories of sand dynamics[J]. Chinese Journal of Geotechnical Engeering, 2012, 34(1): 1-50. (in Chinese) http://cge.nhri.cn/cn/article/id/14487