Supporting effect analysis of the Huangnibian landslide based on MatDEM

Abstract

Objective The Huangnibian landslide is a small- to medium-sized cohesive soil landslide that has shown signs of movement. It is urgent to implement support and remediation measures for this landslide. This study aims at analysing the failure mechanism of the landslide, verifying the stability requirements of existing support structures, and exploring reasonable and effective support locations and forms. Methods This paper establishes a three-dimensional model of the Huangnibian landslide under the condition of a once-in-20-year flood level based on MatDEM. The deformation of the landslide under three conditions of no support, retaining wall support, and the combination of retaining wall and anti-slide pile support were simulated, and then the supporting effect of different supporting schemes according to the displacement field was analysed. Results The simulation results show that: ① The landslide is unstable under the once-in-20-year flood level; ② The sliding body is cut from the slope foot of Binhe Road in the case of no support and from the slope foot of the Expressway in the case of retaining wall support, indicating that the existing retaining wall support structure does not meet the stability requirements of the landslide, and therefore the slope foot of the Expressway needs to be mainly supported; and ③ The scheme that arranges the anti-slide piles at the slope foot of the Expressway and adds a retaining plate between the anti-slide piles is effective to support the landslide and prevent soil between piles from slipping. Conclusion The analysis results can provide references for subsequent engineering design and construction and verify the applicability of MatDEM in landslide analysis.

Keywords

• matdem
• discrete element simulation
• retaining wall
• anti-slide pile
• landslide support effect
• huangnibian landslide