Method to Control the Deformation of Anti-Slide Piles in Zhenzilin Landslide

Hao Wang,Peng Wang,Jianwei Yue,Hongyu Qin,Jianwei Zhang

doi:10.3390/app10082831

Abstract

Anti-slide piles were used in the region of the Zhenzilin landslide in Sichuan, China. The horizontal displacement of these piles exceeds specifications. Deterioration in bedrock properties may cause deformation, thereby causing landslide destabilization. An approach was developed for the analysis of anti-slide pile in two bedrocks with different strengths below the slip surface. A relationship has been established between the modulus of subgrade reaction of the first weak bedrock and reasonable embedded length for landfill slopes with strata of various strengths. Furthermore, the influence of embedding length on deformation has been studied to determine the reasonable embedded length, which helps reduce deformation and ensure landslide stability. The results reveal that (1) at a constant embedded length, horizontal displacement increases with the thickness of the first soft bedrock, meanwhile the maximum shear force remains constant, and the bending moment first increases followed by subsequent decrease; (2) with an increase in the embedded length, horizontal displacement and the maximum shear force of the pile in the embedded bedrock decrease, whereas the bending moment increases; (3) the maximum internal forces and horizontal displacement increase with a decrease in the subgrade reaction modulus of the first weak rock; and (4) the reasonable embedded length of an anti-slide pile increases with a decrease in the subgrade reaction modulus of the first weak bedrock. The proposed approach can be employed to design anti-slide piles in similar landslide regions to control pile-head deformation.

Highlights

During the construction of the Sichuan–Tibet highway, many roadbed slopes were constructed via excavation and dumping
Using the case of the Zhenzilin landslide in Luding county located at southwest of the Sichuan province in China, the objective of this study is to investigate possible factors influencing the pile deformation
The Zhenzilin landslide occurred in Luding County located at southwest of the Sichuan province in China

Summary

Introduction

During the construction of the Sichuan–Tibet highway, many roadbed slopes were constructed via excavation and dumping. Several backfill slopes slide along the original surface of the Sichuan–Tibet. Highway in the southwest Sichuan province of China. This area is mainly characterized by Silurian strata, comprising medium-thick-layered limestone intercalated with mudstone [1]. Anti-slide piles are used in this bedrock to maintain landslide stability [2]. The pile heads often undergo lateral displacement [3,4]. If the pile head deformation is too large, cracks form in the landslide body behind the pile, which provide a channel for surface water infiltration and increase the risk of landslides [5,6]

Objectives

Findings

Discussion

Conclusion