Abstract
For the problems of unreasonable force and large deformation of traditional antislide structure system, three new arch antislide pile-wall structure systems are designed for a loess landslide treatment project in Northern Shanxi province. The working performances of four kinds of antislide structures are numerically simulated and analyzed to realize the optimization of the antislide structure system. The results show that the arch antislide pile-wall structure system is a rigid connection between the piles and cap beam, and the antislide pile, cap beam, and sliding bed soil form a spatial nearly rigid structure. Cap beam can better transfer the bending moment generated by the larger thrust in the landslide middle to the piles with less force on both sides of the landslide, so that the stress and deformation of the whole antislide system tend to be uniform, which makes the antislide system “joint operation.” And this structural form increases the overall stiffness and bending capacity and reduces the possibility that the middle pile is destroyed first and loses its working capacity due to large thrust. Compared with the traditional antislide structure system (Model-1), the average displacement of the pile head is reduced by about 60%, and the total control bending moment of the system is reduced by about 6%. The purpose of Model-3 and Model-4 (anchorage arch antislide pile-wall structure system and pull-rod arch antislide pile-wall structure system) is to restrict the deformation of cap beam in both positive and negative directions of x-axis in arch antislide pile-wall structure system, which plays a certain role in coordinating the deformation of antislide structure and better coordinating the stress of each pile. The arch antislide pile-wall structure system (Model-2), anchorage arch antislide pile-wall structure system (Model-3), and pull-rod arch antislide pile-wall structure system (Model-4) can better adapt and adjust the unbalanced thrust between the landslide piles; therefore, they have higher structural robustness than that of traditional antislide structure system. When achieving the management target with a 95% structural reliability probability of the same landslide, the structural robust degrees of Model-1, Model-2, and Model-4 are 0.58, 0.76, and 0.81, respectively. Therefore, the pull-rod arch antislide pile-wall structure system (Model-4) has the best performance among the other antislide structures. These studies lay a foundation for the engineering structural optimization of arch antislide pile-wall structure system.
Highlights
Landslide refers to the phenomenon of slope movement with a large horizontal displacement component attached to its own weak structural plane [1, 2]
(1) Compared with traditional antisliding structure, cap beam in arch antislide pile-wall structure system can transfer the bending moment produced by the larger thrust in the landslide middle to the piles with less thrust on both sides, so that the stress and deformation of the whole antislide system tend to be uniform, which makes all the piles “joint operation.”
E spatial near rigid structure composed of the pile, cap beam, and sliding bed soil increases the overall stiffness and bending capacity of the antislide structure, which effectively reduce the displacement of pile head. e arch antislide pile-wall structure system has the ability to adjust the internal force of each part of the structure to adapt to the fuzzy and changeable slope problems
Summary
Landslide refers to the phenomenon of slope movement with a large horizontal displacement component attached to its own weak structural plane [1, 2]. Liu et al [24] established a qualitative relationship between stress state and deformation and thermal infrared temperature from experiments to study the deformation and failure mechanism of a landslide stabilized with piles. Xue et al [25] established a 3D finite element model (FEM) of the test to study the stability failure mechanism of PWFSs (pile-wall frame structures), which evaluated the effects of framework width, pile spacing, pile length, and diameter on structural stability. In this paper, taking a loess landslide treatment project in Northern Shanxi province as an example, three new arch antislide pile-wall structure system models are numerically simulated and analyzed to compare their working performances with traditional antislide structure system model including the tress, deformation, and failure characteristics. The concept of structural robustness is put forward to evaluate four kinds of antislide structural systems. us, it lays a foundation for further research and engineering structure optimization of arch antislide pile-wall structure system
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