Study on the Landslide Caused by Difference Creep Behavior of Loess Under Highway Excavation
Keywords:
Loess Plateau; Ancient landslide; Unloading creep; Differential deformation; Stress pathAbstract
Large-scale road construction in mountainous areas inevitably leads to numerous excavation slopes, particularly in the Loess Plateau, characterized by abundant ancient landslides and complex stratigraphy. Excavation-induced stress relief can easily reactivate these ancient landslides, posing significant threats to engineering safety. This study takes an ancient landslide in the Loess Plateau as a case example. Field investigations clarified the lithological characteristics of the strata. Indoor triaxial unloading tests were conducted to examine the unloading creep behavior of silty soil and clay located near the sliding zone. Finally, numerical simulations were employed to analyze the evolution process of landslide reactivation induced by excavation. The study revealed the following findings: (1) The primary factor inducing the landslide is the differential unloading creep behavior of silty soil and clay. Silty soil readily reaches an accelerated creep state under unloading conditions, whereas clay remains relatively stable with smaller deformation. The creep behavior of the soil can be well described using the Nishihara model. (2) Comparison of two unloading stress paths showed that vertical stress unloading causes minor rebound deformation with minimal impact on overall deformation. In contrast, lateral stress unloading results in significant soil deformation, which is the main cause of the landslide. (3) During the landslide, there was an abrupt change in pore water pressure within the soil, which can be combined with deep soil deformation as a key indicator for monitoring and early warning of this type of landslide.
References
landslide considering matric suction. 103(1), 1479-1497.
Zhilu Chang, Faming Huang, Jinsong Huang (2021) Experimental study of the failure mode and mechanism of loess fill slopes induced by rainfall. 1-16.
Xuanyi Chen, Ling Xu, Xin Wei (2024) Study on characteristics of microstructure variations along with the depth of taiyuan collapsible loess. 032(001), 8-18.
G Duan, F Song, H Wang (2024) Stability analysis of unsaturated loess slopes subjected to extreme rainfall incorporating creep effects. 169(May), 1.1-1.17.
Zhao Duan, Zhen-Yan Li, Yan-Bin Wu (2023) Mechanical and microscopic properties of soil according to the rate of increase in pore water pressure. 225, 105530.1-105530.14.
Li Guang, Minggao Tang, Mingli Zhang (2023) Slope stability under the influence of irrigation and frozen stagnant water effect in Heifangtai. 82(7), 254.1-254.18.
Hanxun Wang, Bin Zhang, Yadong Zhou (2022) Stability analysis of road slope cut in cemented conglomerate based on DEM, PSO, and GIM. 81(9), 387.1-387.13.
Xiaokun Hou, Tonglu Li, Sai K Vanapalli (2019) Water percolation in a thick unsaturated loess layer considering the ground-atmosphere interaction. 33(5), 794-802.
Laiming Huang, Ming'an Shao (2019) Advances and perspectives on soil water research in China's Loess Plateau. 199, 1-22.
Jun-Jie Wang, Yue Liang, Hui-Ping Zhang (2014) A loess landslide induced by excavation and rainfall. 11(1), 141-152.
Jia-xu Kong, Jian-qi Zhuang, Jie-wei Zhan (2021) A landslide in Heifangtai, northwest of the Chinese Loess Plateau: triggered factors, movement characteristics, and failure mechanism. 18(10), 3407-3419.
Zhe Li, Jinpeng Zhao, Chenhui Guan (2023) A field test study on the effect of artificial rainfall on instability characteristics of loess slopes. 16(6), 1-5.
B Lian, X Wang, H Zhan, J Wang (2022) Creep mechanical and microstructural insights into the failure mechanism of loess landslides induced by dry-wet cycles in the Heifangtai platform, China. 300, 106589.1-106589.19.
Zhen-jiang Meng, Peng-hui Ma, Jian-bing Peng (2021) Characteristics of loess landslides triggered by different factors in the Chinese Loess Plateau. 18(12), 3218-3229.
Xiangjun Pei, Xiaochao Zhang, Bin Guo (2017) Experimental case study of seismically induced loess liquefaction and landslide. 223, 23-30.
Taixin Peng, Ningsheng Chen, Guisheng Hu (2022) Failure mechanism of Dege landslide in western China, March, 2021: the loess interlayer and multiple water resources. 19(9), 2189-2197.
Qingyi Mu, Longlong Meng, Yanqian Shen (2023) Effects of clay content on the desiccation cracking behavior of lowplasti city soils. 82(8), 317.1-317.12.
Raouf Arif, Feng Tugen, Kunyong Zhang (2024) Field and Numerical Investigation of Taihu Resort Cut Slope Failure in Suzhou, China. 14(7), 1-26.
S Zhang, X Pei, S Wang (2020) Centrifuge Model Testing of Loess Landslides Induced by Excavation in Northwest China. 20(4), 4020022.1-4020022.18.
Youbin Sun, Hongxuan Lu, Zeke Zhang (2024) New progress in quantitative reconstruction of paleoclimate changes in the Chinese Loess Plateau. 098(003), 1006-1023.
Zhijie Sun, Xuanyu Yang, Ziyang Zhao (2022) Study on deformation characteristics of different angle loess slopes under wet-dry alternation. 15(12), 1-5.
Haojie Wang, Ping Sun, Jian Ren (2022) Reactivation mechanism and run-out processes of the Wangqi landslide induced by water leakage on April 30, 2022, in Tianshui City, Gansu Province, China. 20(5), 999-1011.
Kanglin Wu, Ningsheng Chen, Guisheng Hu (2021) Failure mechanism of the Yaoba loess landslide on March 5, 2020: the early-spring dry spell in Southwest China. 18(9), 3183-3195.
Xiaohua Wu (2022) Study on Stick-Slip Characteristics of Loess-Bedrock Interface of Ancient Landslide. 000(004), 17-21.
Xian Yu, Wei Xueli, Zhou Haibo (2022) Snowmelt-triggered reactivation of a loess landslide in Yili, Xinjiang, China: mode and mechanism. 19(8), 1843-1860.
Xu Panpan, Qian Hui, Zhang Qiying (2022) Response mechanism of permeability change of remolded loess to seepage parameters. 612(Pt.B), 128224.1-128224.13. https://doi.org/10.1016/j.jhydrol.2022.128224
Yan Rui-Xin, Peng Jian-Bing, Zhang Jin-Yuan (2020) Static Liquefaction Capacity of Saturated Undisturbed Loess in South Jingyang Platform. 12(8), 1-24.
Yang X., Chen Y. (2024) Characteristics and mechanism of landslides on highway landfill along Xiaolangdi Reservoir of the Yellow River: a case study. https://doi.org/10.1007/s11069-024-06607-z
Yang Xuanyu, Wang Yanchao (2020) Study on the surface particle distribution characteristics of silt with different moisture content. 13(1), 1-9.
Yao Hai-lin, You Hui-jie, Fan Yong-feng (2013) Study of sliding mechanism of Liujiaao loess landslide. 34(1), 182-188.
Zhou Y F, Tham L G, Yan W M (2014) Laboratory study on soil behavior in loess slope subjected to infiltration. 183, 31-38.
Downloads
Published
Issue
Section
License
Copyright (c) 2024 Authors and Global Journals Private Limited
This work is licensed under a Creative Commons Attribution 4.0 International License.
