Experimental study of the progressive collapse mechanism of excavations retained by cantilever piles

Cheng, Xuesong; Zheng, Gang; Diao, Yu; Huang, Tao; Deng, Caiyan; Nie, Dongqing; Lei, Yiwen

doi:10.1139/cgj-2016-0284

Cited by 29 publications

(8 citation statements)

References 18 publications

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“…e maximum bending moment value of the supporting piles in the core area of influence increases the most, indicating that the load is mainly transferred to this area. It can be further concluded that the loading effect caused by the construction of cutting supporting piles is the most significant in this area [37][38][39].…”

Section: Load Transfer Trends Of Supporting Piles After Cuttingmentioning

confidence: 92%

Effects of Partial Supporting Pile Removal from Deep Foundation Pits by Shallow Excavation Method in Loess Areas

Zheng

Ren

et al. 2021

Advances in Materials Science and Engineering

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Partial supporting piles removal from deep foundation pit may lead to large-scale foundation pit collapse, resulting in severe consequences. Various studies have investigated the underpinning technology of cutting abutment piles by combining field monitoring and numerical simulation, but there are few studies on cutting supporting piles of foundation pit by the shallow excavation method. Taking an actual deep and large foundation pit as an example, the finite element method (FEM) was adopted to study the surface settlement and the changing trend of the force and displacement of the supporting pile caused by cutting piles during the shallow excavation of double tunnels. The FEM results were verified with the field monitoring data. The simulation results show that the surface settlement around the foundation pit mainly occurs at the pile cutting stage under different excavation sequences (0D, 1D, 2D), and the main distribution area is the one-fold diameter area outside the double tunnel. After the supporting piles are partially cut, the bending moment and displacement of the lower part of the broken piles differ significantly due to different excavation sequences, but the bending moment and displacement of the upper part of the broken piles are basically similar. In the process of removing the supporting piles, the Earth pressure behind the piles is redistributed, and the load is mainly transferred to the adjacent supporting piles outside the tunnel within the radius of one time of the tunnel diameter. However, the load is not evenly transferred to the adjacent supporting piles. Some recommendations for the reinforcement scheme of the supporting structure during cutting supporting piles in deep foundation pit are also proposed. The research results can provide theoretical basis and practical guidance for the construction of similar projects in the future.

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Section: Load Transfer Trends Of Supporting Piles After Cuttingmentioning

confidence: 92%

Effects of Partial Supporting Pile Removal from Deep Foundation Pits by Shallow Excavation Method in Loess Areas

Zheng

Ren

et al. 2021

Advances in Materials Science and Engineering

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“…The ratio of the pile wall bending moment when the reinforcement in the pile reaches the ultimate tensile strength to the design bending moment is the safety coefficient, K d . 37,38 If I . K d , the pile will be damaged; conversely, the pile will keep working if I \ K d .…”

Section: Deformation and The Internal Force Of The Pile Wallmentioning

confidence: 99%

A numerical study on the influence of anchorage failure for a deep excavation retained by anchored pile walls

Zhao

Han

Yang

et al. 2018

Advances in Mechanical Engineering

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This article aims to study the mechanical behavior of a deep excavation occurring in sandy soils retained by anchored pile walls under anchorage failure conditions. The primary causes and types of anchorage failures are summarized. Based on an excavation case history, a numerical investigation is conducted using a PLAXIS-based finite element method to reveal the crucial mechanical behaviors of the retaining structure and soil layers as a result of different types of anchorage failures. According to the simulation results, the responses to anchorage failures are analyzed, and the safety coefficient for the retaining structure is presented. The analysis for this numerical work indicates that dangerous failure positions appear at the top of the pile wall or in the region near the excavation bottom. Then, a three-dimensional numerical model is established to analyze the mechanical behaviors and the influence scopes of the retaining structure caused by individual anchor failures. Special emphasis is placed on the analysis of the bending moments and horizontal displacements in the wall, as well as on the prestress and internal forces in each of the row anchors, displacements, and plastic strains in the ground and stabilities of the deep excavation. Conclusions obtained from the numerical study can provide guidelines for good practices in the construction of anchored pile wall-retained excavations in sandy soil.

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“…As a result, the full potential of the steel supports is not realized [11], and the DC joint becomes a critical vulnerability in the steel support system, compromising the overall bearing capacity. The inadequate performance of these joints can lead to catastrophic failures, as evidenced by several foundation pit accidents [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Study on the Influence of the Performance Weakening of the Disconnectable Coupling (DC) Joint of Steel Support on the Retaining Structure of a Foundation Pit

Xie,

Liu,

Niu

et al. 2024

Buildings

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In order to quantitatively study the influence of the weakening of the disconnectable coupling joint (DC joint) on the retaining structure, the pre-axial force retention performance of the steel support, the axial force of the steel support, the horizontal displacement of the diaphragm wall, and the ground settlement around the foundation pit were monitored during the construction of the foundation pit. The evolution process of the monitoring data was analyzed, and the corresponding numerical model verified by the monitoring data was established. The influence of the yield load of the DC joint, the initial compression stiffness, and the weakening of the pre-axial force on the stability of the retaining structure was studied by numerical simulation. The results show that the pre-axial force of steel support is only 67% of the design value when the soil below is not excavated within 24 h. The DC joint has a significant weakening effect on the steel support, which is unfavorable for the stability control of the foundation pit retaining structure. The pre-axial force and initial bending stiffness have a great influence on the stability of the retaining structure. When the yield load is not lower than that of the row piles, the DC joint has no effect on the stability of the retaining structure. This model can predict and analyze the deformation trend under different working conditions to a certain extent, providing certain reference value for safety plans during construction.

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Experimental study of the progressive collapse mechanism of excavations retained by cantilever piles

Cited by 29 publications

References 18 publications

Effects of Partial Supporting Pile Removal from Deep Foundation Pits by Shallow Excavation Method in Loess Areas

Effects of Partial Supporting Pile Removal from Deep Foundation Pits by Shallow Excavation Method in Loess Areas

A numerical study on the influence of anchorage failure for a deep excavation retained by anchored pile walls

Study on the Influence of the Performance Weakening of the Disconnectable Coupling (DC) Joint of Steel Support on the Retaining Structure of a Foundation Pit

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