Study on the Mechanical Characteristics and Ground Surface Settlement Influence of the Rise–Span Ratio of the Pile–Beam–Arch Method

Lv, Jianbing; Lu, Jianjun; Wu, Hao

doi:10.3390/app13095678

Cited by 2 publications

(2 citation statements)

References 39 publications

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“…In the study of the existing hole pile method [8,32], it was found that the excavation of the guide hole was the main construction stage that caused the surface settlement. Controlling the settlement of the guide hole is conducive to controlling the settlement of the subsequent construction process.…”

Section: Simulation Of Construction Stagementioning

confidence: 99%

Deformation Analysis and Reinforcement Effect of Tunnel Pile Excavation of a Subway Station in a Weak Stratum

Lv,

Lu,

Huang

et al. 2023

Buildings

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The underground hole pile excavation method causes a large vertical displacement in a weak stratum, which affects the safety of structures. For the first time, the hole pile excavation method is being used to construct a subway station in South China, and the settlement law of the area is not clear. It is important to clarify the deformation law of the hole pile excavation method in weak strata and the effect achieved by appropriate reinforcement measures. In this paper, by establishing a three-dimensional finite element model of the structure–soil contact element and combining it with the field monitoring data, the law of surface settlement caused by the hole pile excavation method with different thicknesses of the weak stratum has been studied. In order to improve the stability of the surrounding rock and reduce the vertical deformation of the surface, the Metro Jet System (MJS) is used to form inclined piles in the area of large surface deformation, and the effect after reinforcement was evaluated. The results show that as the weak layer thickness ratio increases, the surface settlement also increases. In the case of no reinforcement, a vertical settlement of 116 mm can be achieved when the thickness of the weak layer is 14 m. The vault of the tunnel is in the weak layer and the deformation is obvious. When the vault is not in the weak layer, the settlement is obviously reduced. After MJS pile reinforcement, under the action of soil extrusion, the self-stability of the surrounding rock is strengthened, and the oblique jet grouted pile forms a stable ‘triangle’. The vertical settlement value is basically stable at around 30 mm, which meets the requirements of the regulations. If the tunnel is not reinforced, the self-stability of the surrounding rock above the tunnel arch is poor and the maximum settlement is at the surface. After MJS reinforcement, the maximum settlement is at the vault. The vertical settlement of the ground surface can be effectively controlled by using the MJS pile forming technology in the middle of the tunnel pile driving method.

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Section: Simulation Of Construction Stagementioning

confidence: 99%

Deformation Analysis and Reinforcement Effect of Tunnel Pile Excavation of a Subway Station in a Weak Stratum

Lv,

Lu,

Huang

et al. 2023

Buildings

Self Cite

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“…The side pile transmits the load of the upper soil to the deep soil and is vital in limiting the deformation of the station. The previous research on metro stations with PBA method mostly focused on the control of surface settlement and the optimization of the excavation method (Wang and Guo 2016;Yu et al 2019;Li and Chen 2020;Guo et al 2021;Lv et al 2023). On the other hand, there are few studies on the design and mechanical effects of the side piles of the station with PBA method at home and abroad.…”

Section: Introductionmentioning

confidence: 99%

Research on the mechanics differences between single-row and double-row side piles of station using the PBA method

Pei,

Sun,

Guo

et al. 2023

Electron. J. Struct. Eng.

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The side pile is a crucial mechanical component in station construction using the PBA (pile-beam-arch) method, and its stability during the construction process cannot be overstated. The mechanical differences between single-row and double-row side piles in this construction method have garnered significant attention, yet few studies have been conducted on this matter. Therefore, this paper employs numerical simulation to compare the deformation and mechanical properties of single-row and double-row side piles (the adopted pile type is micro steel pipe pile, abbreviated as MSPP) in a metro station using the PBA method. The findings are validated through the model experiment. It is found that the soil arch effect created by the front-row pile of the double-row piles serves as the primary lining, offering a certain shielding effect to the soil stress behind the back-row pile. Notably, the soil stress values in double-row pile conditions are slightly higher compared to single-row pile condition, leading to a noticeably smaller final deformation of the pile top. The combined bending moments and axial forces of the front-row and back-row piles in double-row piles exceed those of a single-row pile. Specifically, bending moments are highest in single-row piles, followed by front-row piles and then back-row piles, while axial forces are highest in single-row piles, followed by back-row piles and then front-row piles. This suggests that the bending moments and axial forces of double-row piles are smaller than those of a single-row pile. The internal force distribution within the double-row pile is more balanced, thereby enhancing the lining strength and improving the station’s safety through the PBA method. The findings in this paper can serve as valuable references for the design and construction of similar projects.

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Study on the Mechanical Characteristics and Ground Surface Settlement Influence of the Rise–Span Ratio of the Pile–Beam–Arch Method

Cited by 2 publications

References 39 publications

Deformation Analysis and Reinforcement Effect of Tunnel Pile Excavation of a Subway Station in a Weak Stratum

Deformation Analysis and Reinforcement Effect of Tunnel Pile Excavation of a Subway Station in a Weak Stratum

Research on the mechanics differences between single-row and double-row side piles of station using the PBA method

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