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A Case Study of the Rapid and Long Runout Landslide at Hong’ao Waste Disposal Site in Shenzhen, China

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A disastrous landslide occurred at the Hong’ao Waste Disposal Site in Shenzhen, China on December 20, 2015, involving a volume of 2.7 × 106 m3 of municipal solid waste (MSW) that travelled a distance of 700 to 800 m, covering an area of 3.8 × 105 m2 and caused 90 casualties. The geomorphological and geological characteristics of the waste disposal site were carefully examined and the landslide was classified as an extremely rapid flowslide. The major feature of the waste site was the basin-like structure with the bottom composed of low-permeable granite bedrock. Therefore, surface runoff could easily accumulate in the MSW due to the lack of drainage system, resulting in an increasing groundwater level. Laboratory tests, including physical characterization, Consolidation Isotropic Undrained (CIU) test and direct shear test were conducted to characterize the material properties of the MSW. Physical characterization indicated the MSW belongs to sandy silt, CIU tests indicated that static liquefaction was conducive to high-speed sliding. The direct shear test data were used to carry out numerical analysis of slope stability, in which the continuous rise in the groundwater level was taken into account. Numerical simulation showed that the pore water pressure induced by underground water seepage and gradual loading from the upper MSW placement aggravate the failure. Consequently, the main reason of the landslide could be concluded as follows: 1) the perched groundwater level due to a large upstream catchment area and the lack of drainage system; 2) the excess pore water pressure induced by static liquefaction played a significant role in its mobility.

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This work was supported by the National Key Research and Development Program of China (No.2018YFC1505503); the Science and Technology Service Network Initiative (No. KFJ-SW-STS-180) and the Key Scientific Research project of Higher Education Institutions, Henan Province, China (No.20A560024).

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Correspondence to Fangqiang Wei.

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Wang, K., Zhang, S., Wei, F. et al. A Case Study of the Rapid and Long Runout Landslide at Hong’ao Waste Disposal Site in Shenzhen, China. KSCE J Civ Eng 24, 727–739 (2020). https://doi.org/10.1007/s12205-020-1399-x

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  • Waste disposal site
  • Municipal solid waste
  • Landslide
  • Static liquefaction
  • Groundwater table