Preprints
https://doi.org/10.5194/esurf-2021-62
https://doi.org/10.5194/esurf-2021-62

  27 Sep 2021

27 Sep 2021

Review status: this preprint is currently under review for the journal ESurf.

Failure mode of rainfall-induced landslide of granite residual soil, southeastern Guangxi province, China

Shanbai Wu1,2,3,4, Ruihua Zhao1,2,3, Liping Liao1,2,3, Yunchuan Yang1,2,3, Yao Wei1,2,3, and Wenzhi Wei1,2,3 Shanbai Wu et al.
  • 1College of Civil Engineering and Architecture, Guangxi University, Nanning 530004, China
  • 2Guangxi Key Laboratory of Disaster Prevention and Engineering Safety, Guangxi University, Nanning 530004, China
  • 3Key Laboratory of Disaster Prevention and Structural Safety of Ministry of Education, Guangxi University, Nanning 530004, China
  • 4Faculty of Engineering, China University of Geosciences, Wuhan 430074, China

Abstract. Granite residual soil landslides are widely distributed in southeastern Guangxi province, China. They are posing a huge threat to local communities and hindering social and economic development. To understand the failure mode of the landslide can provide a scientific basis for early warning and prevention. In this study, it conducted artificial flume model tests to investigate the failure mode of granite residual soil landslide. The macroscopic phenomena of landslides in the flume were summarized. The changes of soil moisture content along with pore water pressure were analyzed. And the differences and commonness in the initiation patterns of landslides were discussed. The results had four aspects. (1) There were significant similarities in the phenomenon of slope failures. In the beginning of the artificial rain, slopes were infiltrated, following by the slope toe soil softened and slipped. Another similar pattern was that continuous rainfall could cause soil crusts and runoff on the slope surface. Short-term low-lying areas and interlocking ditches would appear due to surface runoff and rainwater erosion. (2) The increase of initial dry density enhanced the permeability resistance of rainwater to the residual soil, which led to a delay in the response time of water content and pore water pressure, and a decrease in pore water pressure. Moreover, the fluctuation characteristics of pore water pressure may be related to the type of soil shear deformation. (3) The starting time of a landslide was delayed as the initial dry density and slope angle increased, but it was shortened due to the increase in rainfall intensity. Meanwhile, the initiation pattern changed from a sudden sliding type to a progressive failure type due to the increase of initial dry density. (4) The failure process of the granite residual soil landslide could be classified into five stages: rainwater infiltration, soil sliding at the slope toe, the occurrence of surface runoff and erosion, the formation of a steep free face, and the upper soil sliding. Above research results can provide valuable references for the prevention and warning of granite residual soil landslide in southeast Guangxi.

Shanbai Wu et al.

Status: open (until 30 Nov 2021)

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Shanbai Wu et al.

Shanbai Wu et al.

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Short summary
Granite residual soil landslides are widely distributed in southeastern Guangxi province, China. In this study, it conducted artificial flume model tests to investigate the failure mode of granite residual soil landslide. The research results can provide valuable references for the prevention and warning of granite residual soil landslide in southeast Guangxi.