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Mechanism analysis of Zulongding landslide on gentle piedmont slope: a creeping landslide triggered by rainfall

Author

Listed:
  • Liangchen Yu

    (Nanjing University)

  • Changhong Yan

    (Nanjing University)

  • Shulan Guo

    (Anhui Jianzhu University)

  • Hui Li

    (Nanjing Metro Group Co., Ltd)

  • Jinzhong Tan

    (The 1st Geological Brigade of Jiangsu Geology and Mining Exploration Bureau)

  • Gang Liu

    (The 1st Geological Brigade of Jiangsu Geology and Mining Exploration Bureau)

  • Chenghua Xu

    (The 1st Geological Brigade of Jiangsu Geology and Mining Exploration Bureau)

  • Yang Liu

    (Guangzhou Urban Planning Survey and Design Institute)

Abstract

Due to increasing extreme heavy rainfall events, landslides have increased significantly on gentle piedmont slopes in Jiangsu Province, China, in recent years. The Zulongding landslide is a creeping landslide at the northeastern toe of Fangshan Hill, Nanjing City, Jiangsu Province, representing a typical slide on gentle piedmont slope. In July 2016, tension cracks appeared on roads near Zulongding due to rainfall, posing potential safety risks to the scenic area. Although the road cracks were sealed and repaired in time, the Zulongding area has experienced slow sliding, and the cracks are expanding slowly. On October 25, 2016, Zulongding experienced a large-scale, rapid slide caused by continuous heavy rainfall for 16 days as a result of the 2015–2016 EI Nino event. Field investigations, drilling holes, groundwater level monitoring, surface displacement monitoring, and numerical simulation were carried out to determine the geological features, deformation characteristics, sliding mechanism, and failure mode. An analysis of the monitoring data and the simulation results indicated the main reason for the landslide was a rise in pore pressure in the stratigraphic structure. As a result, the uplift pressure increased due to the confined water, decreasing the strength in the silty clay layer above the gravel layer and causing a slide. The deformation consisted of initial deformation, isokinetic deformation, and accelerated deformation. The seepage deformation and pressure balance theories are used to discuss the failure mode of the landslide. The results of this study contribute to safety evaluations and the prevention of similar landslide geological hazards.

Suggested Citation

  • Liangchen Yu & Changhong Yan & Shulan Guo & Hui Li & Jinzhong Tan & Gang Liu & Chenghua Xu & Yang Liu, 2023. "Mechanism analysis of Zulongding landslide on gentle piedmont slope: a creeping landslide triggered by rainfall," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 118(2), pages 1211-1234, September.
    • Handle: RePEc:spr:nathaz:v:118:y:2023:i:2:d:10.1007_s11069-023-06051-5
    DOI: 10.1007/s11069-023-06051-5
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    References listed on IDEAS

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    1. Vikram Gupta & Rajinder Bhasin & Amir Kaynia & Ruchika Tandon & B. Venkateshwarlu, 2016. "Landslide Hazard in the Nainital township, Kumaun Himalaya, India: the case of September 2014 Balia Nala landslide," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 80(2), pages 863-877, January.
    2. Vikram Gupta & Rajinder K. Bhasin & Amir M. Kaynia & Ruchika Sharma Tandon & B. Venkateshwarlu, 2016. "Landslide Hazard in the Nainital township, Kumaun Himalaya, India: the case of September 2014 Balia Nala landslide," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 80(2), pages 863-877, January.
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