Numerical Study of Consolidation Effect on the Response of Passive Piles Adjacent to Surcharge Load

Yang, Min; Shangguan, Shiqing; Li, Weichao; Zhu, Bitang

doi:10.1061/(asce)gm.1943-5622.0000991

Cited by 14 publications

(10 citation statements)

References 26 publications

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“…The drainage consolidation of foundation soil is not immediately completed after the applying of earth heap. The drainage consolidation of soil is a long process, and the inclination of the pile slowly increases until it reaches stability 35 . In this process, the drainage consolidation of foundation soil did not reach a stable state, so the longer the loading time, the more serious was the drainage consolidation of the foundation soil, and greater was the inclination of the pier.…”

Section: Calculation Results and Discussionmentioning

confidence: 99%

A numerical analysis of inclination and rectification of ramp-bridge piers adjacent to surcharge load in soft clay area

Shen

Mao

Ding

et al. 2023

Sci Rep

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The surrounding surcharge has an adverse impact on the service performance of buildings and bridges, and it can endanger their structural safety, especially in soft soil areas. As one case study, the inclination accident of an expressway ramp bridge and its rectification are investigated in this study. Through the three-dimensional (3D) finite element (FE) analysis of the overall structures composed of the bridge span, the pier, and the pile foundation, the whole process of the inclination by the adjacent dumped earth, partial recovery by the unloading, and the lateral pushing rectification of the bridge structure were simulated. The results show that the surcharge load leads to soil displacement near the bridge pile, and the pile-soil interaction leads to the pile deformation, which further causes the inclination of the pier, and the movement of the bridge span. The severity of the accident can be measured by the inclination of the piers and the opening widths of the bridge expansion joints. Due to the plastic deformation and drainage consolidation of the soft clay foundation under the surcharge load, the inclination of the piles and piers cannot be fully recovered after unloading. In order to capture these processes, the FE simulation was divided into three steps. First, the drainage consolidation of the soil foundation were identified by FE simulation and the field measurement of the recovery of the structure after unloading. Second, the effects of soil properties, the surcharge time and surcharge strength on the bridge inclination and the recovery capacity after unloading are discussed. Finally, the rectification of the bridge by lateral pushing was simulated, and the deformation and stress in the pier and pile were calculated to evaluate the safety of the structures. These analyses provided understanding towards the prevention of the bridge inclination under surcharge load, prediction of the recovery by the unloading, and the methods to reduce the residual deformation to meet the specifications.

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Section: Calculation Results and Discussionmentioning

confidence: 99%

A numerical analysis of inclination and rectification of ramp-bridge piers adjacent to surcharge load in soft clay area

Shen

Mao

Ding

et al. 2023

Sci Rep

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“…The primary cause of the collapse of the Baosteel warehouse in Shanghai has been revealed as long-term repetitive loading and unloading, which resulted in excessive lateral displacement and the accumulated displacement of both the soil and pile foundations. And the collapse of a 13-story residential building south of Dingpu River in Shanghai has indicated that the horizontal movement of the soil induced by external factors indirectly affects the lateral loading on the pile, which caused a severe impact on adjacent pile foundations [1][2][3]. Therefore, it is crucial to fully comprehend the interaction between passive piles and the surrounding soil.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Passive Pile Groups’ Responses Induced by Combined Surcharge-Induced and Excavation-Induced Horizontal Soil Loading

Li,

Yang

2023

Buildings

Self Cite

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Excessive lateral forces and the deformation of pile groups caused by adjacent surcharge loading and excavation can potentially lead to the failure or collapse of nearby pile foundations. This paper presents a simplified analytical method to investigate the lateral displacement of passive pile groups caused by combined surcharge-induced and excavation-induced horizontal soil loading and validates it by utilizing two published centrifuge tests and numerical modeling. Firstly, the passive load resulting from surcharge-induced horizontal soil loading is determined using the improved formula of Boussinesq and the theory of local plastic deformation. The additional horizontal force exerted on the pile axis subjected to excavation-induced horizontal soil loading is also taken into account using the Mindlin solution. Furthermore, the shielding effect between pile groups is also proposed to analyze the response of a laterally loaded pile group due to excavation unloading. Secondly, according to the Pasternak foundation model of soil–pile interaction, the equilibrium differential equations are solved by the finite difference method. Finally, parametric analyses are undertaken to evaluate the behavior of different constraints on the pile head and surcharge procedure. The results demonstrate that the capped-head pile groups can provide greater restraint compared to the free-head groups for the lateral displacement of pile groups. The front pile experiences greater forces than the rear one in passive pile groups as a result of the smaller soil pressure on the rear pile. Additionally, increasing the horizontal stiffness of the capped head with fully fixed ends can significantly decrease the horizontal deformation of the pile groups.

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“…Based on the calculated horizontal soil pressure, the horizontal deformation of the pile foundation was then studied. Existing studies showed that the displacement of high‐speed railway pile was mainly lateral displacement, 32 which was closely related to the loading conditions 33–35 . At present, the elastic foundation beam theory was mostly used when solving the horizontal deformation of single pile due to the horizontal soil pressure 36–38 .…”

Section: Introductionmentioning

confidence: 99%

“…Existing studies showed that the displacement of high-speed railway pile was mainly lateral displacement, 32 which was closely related to the loading conditions. [33][34][35] At present, the elastic foundation beam theory was mostly used when solving the horizontal deformation of single pile due to the horizontal soil pressure. [36][37][38] Some scholars used their own model tests to validate the calculation methods of horizontal deformation of pile foundation.…”

Section: Introductionmentioning

confidence: 99%

Theoretical method for additional horizontal stress of isolation piles due to adjacent loading

Zhou

Shan

Wang

et al. 2022

Num Anal Meth Geomechanics

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Isolation piles are widely used to increase the horizontal resistance of high-speed railway under adjacent loading in soft soils. This study proposes a theoretical model for horizontal additional stress of pile-reinforced area subjected to adjacent loading. The isolation piles and the soil between piles in the reinforcement area are equivalent to a uniform medium in the proposed model. The Heaviside function is introduced to avoid the partition solution problem of pile-reinforced area and the foundation soils. A combined method with the inverse Fourier transform, Gauss integral, Lagrange quadratic interpolation, and Simpson quadrature formula is employed in the calculation process. The theoretical model is validated by the finite element method. According to the calculated results, the distribution of horizontal additional stress is obtained. The horizontal soil displacements at the location of the railway increases in the depth range of 0-2.5 m and then gradually decreases. The proposed model with engineering significance is available for preliminary design of isolation piles.

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Numerical Study of Consolidation Effect on the Response of Passive Piles Adjacent to Surcharge Load

Cited by 14 publications

References 26 publications

A numerical analysis of inclination and rectification of ramp-bridge piers adjacent to surcharge load in soft clay area

A numerical analysis of inclination and rectification of ramp-bridge piers adjacent to surcharge load in soft clay area

Investigation of Passive Pile Groups’ Responses Induced by Combined Surcharge-Induced and Excavation-Induced Horizontal Soil Loading

Theoretical method for additional horizontal stress of isolation piles due to adjacent loading

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