Abstract
Antislide piles are set in the Zhangjiawan landslide area, where the general features of the bedrock below the slip surface include upper weak and lower hard strata. Based on a site investigation, the horizontal displacement of the antislide pile head is 14.8 cm, which is not conducive to the stability of the landslide. In the study, a displacement calculation method for the pile under trapezoidal load is proposed for a colluvial landslide controlling. Furthermore, factors affecting the deformation and internal forces of the pile were also studied. The results indicated that (1) when the embedded length of an antislide pile increases, the horizontal displacement on the pile and maximum absolute shear force decrease, while the bending moment of the pile exhibits opposite trends; (2) the relationship between maximum shear force and maximum bending moment is linear with increasing driving force of landslide; and (3) increase in the ratio of the driving force between the pile head and slip surface (q0/q1) steadily increases the horizontal displacement of the pile. The relationship between the distribution of the driving force (q0/q1) and the reasonable embedded length of a pile is a quadratic function, which can be used to determine the reasonable embedded length of a pile under the action of rectangular or triangular loads. It is very useful to use the above method to guide the design of antislide piles in similar areas.
Highlights
Several colluvial landslides have occurred in the northeastern Sichuan province of China
Antislide piles play an important role and coordinate deformation with the surrounding soil to improve the stability of the whole slope [9,10,11,12]. e excavation or increases in the driving force of landslides behind piles lead to the deformation of piles and even pile damage [13,14,15]. e distributions of slope pressure that act on the section of an antislide pile significantly affect the internal force and deformation on the pile [16, 17]. e equation of pile deformation, as proposed under different lateral load patterns, is related to the elastic modulus and moment of inertia of the pile. e cantilever pile length affects the distributions of slope pressure above the slip
We used a case study of the Zhangjiawan landslide in Tongjiang county in the northeast Sichuan province, China. e objective of our study is to propose a method for ascertaining the reasonable embedded length of antislide piles to control the deformation of pile head under the different distributions of the driving force (q0/q1) in the area with upper weak and lower hard strata
Summary
Several colluvial landslides have occurred in the northeastern Sichuan province of China. E aforementioned studies examined the mechanism of pile deformation with a single rock layer and focused on the effect of pile length on slope stability with a multilayered stratum. The interaction mechanism between the deformation behavior of antislide piles under trapezoidal distributed load in multilayered bedrock with upper weak and lower hard stratum and corresponding approaches to control the deformation are highly important. E objective of our study is to propose a method for ascertaining the reasonable embedded length of antislide piles to control the deformation of pile head under the different distributions of the driving force (q0/q1) in the area with upper weak and lower hard strata. E factors affecting the reasonably embedded length of antislide piles, pile deformation, and internal forces are analyzed in detail
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