Abstract

The concrete expanded pile is a new type of pile in the field of foundation engineering, which exhibits improved performance compared to the ordinary straight-hole pile. The expanded technique increases the bearing capacity of the pile, changes the overall load-bearing function of the pile body, and offers great development prospects. While the performance of the expanded pile has been studied for vertical loading, the performance of expanded pile when subjected to horizontal loading is not adequately understood. In order to investigate the performance of concrete expanded pile in resisting horizontal loads, particularly the anti-overturning capacity of rigid and flexible piles, this paper conducts an experimental model test and performs a numerical simulation. In the experiment, an innovative model test method is used for testing small-scale half-face pile with undisturbed soil. A custom-made soil extractor and a loading device are used to observe various stages of pile-soil interaction in real-time during the whole process of loading. Meanwhile, finite element simulation analysis is conducted on a pile model and the corresponding data on displacement, load, stress, and strain are collected to verify the experimental results. Based on the horizontal bearing capacity of rigid and flexible piles and the failure states of soil mass around the piles, two calculation models are proposed for the horizontal bearing capacity of rigid and flexible concrete expanded piles. The models will provide reliable theoretical guidance for the application of concrete expanded pile in engineering applications and for the research and development of pile foundation.

Highlights

  • According to the previous preliminary experimental study, it is found that the failure state of rigid and flexible piles under horizontal load is quite different, and the failure mechanism and the calculation method of bearing capacity should be determined separately

  • Few studies exist on the ultimate bearing capacity of flexible expanded piles and soil damage around the piles under horizontal load. erefore, this paper proposes a numerical model of horizontal anti-overturning bearing capacity of rigid and flexible piles by conducting a unique model test of small-scale half-face pile and performing an ANSYS finite element simulation. is model is expected to provide a theoretical basis for the design and development of concrete expanded pile

  • Finite element software ANSYS was used to simulate the influence of horizontal bearing capacity of different types of concrete expanded piles. e rigidity/flexibility of the expanded pile and the location of the load-bearing plate were important factors affecting the interaction between piles and soil, and the interaction state of piles and their failure were directly related to the bearing capacity of an individual pile

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Summary

Introduction

According to the previous preliminary experimental study, it is found that the failure state of rigid and flexible piles under horizontal load is quite different, and the failure mechanism and the calculation method of bearing capacity should be determined separately. Erefore, this paper proposes a numerical model of horizontal anti-overturning bearing capacity of rigid and flexible piles by conducting a unique model test of small-scale half-face pile and performing an ANSYS finite element simulation. Rough an ANSYS finite element numerical simulation analysis and a test of the small-scale half-section model pile, the effects of soil failure states of rigid and flexible concrete expanded pile under horizontal load were studied, and a calculation method for the anti-overturning capacity under horizontal load was determined. (3) According to the failure states of different piles, calculation models were proposed for different antioverturning bearing capacities of rigid and flexible concrete expanded piles

Experimental Study
Finite Element Simulation Analysis on Rigid Piles and Flexible Piles
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