Numerical Study on the Reinforcement Measures of Tunneling on Adjacent Piles

Qiu, Hongsheng; Wang, Zhe; Ayasrah, Mo’men; Fu, Chuanbang; Luo, Gang

doi:10.3390/sym14020288

Cited by 12 publications

(7 citation statements)

References 32 publications

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“…In Figure 2A is the effect of soil stress disturbance directly caused by excavation; B is the stress that has been transferred to the railway bridge pile; C is the lateral frictional resistance of the isolation pile caused by surface settlement; and D is the effect of the isolation pile on the lateral earth pressure. When the soil is deformed due to excavation, the deformation is transferred to the pile location and will cause the pile to move and deform, but the displacement and stress of the isolation pile will also develop synchronously, and resist the influence at the same time Weng et al, 2023, Qiu et al, 2022. Although the soil stress disturbance caused by excavation is continuously transmitted the lateral earth pressure is constrained by the isolation pile, and the two effects cancel each other out, so the stress that is transmitted to the railway bridge pile is greatly reduced.…”

Section: Mechanism Of Isolation Pile Actionmentioning

confidence: 99%

Study on the restraint control of an isolation pile on an existing high-speed railway during the close passing of a shield machine

et al. 2023

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The impact of shield construction on the close lateral passing of high-speed railways can threaten the safety of operating high-speed railways. To study the deformation characteristics of the shield structure after the application of isolation piles from the ground surface and the deformation characteristics of the bridge piers of an overpassing high-speed railway, we analyze the mechanism of isolation pile restraint control and establish a three-dimensional numerical model of a shield structure to study the situation of a high-speed railway with a metro interval under passing a high-speed railway passenger line project. Combined with the measured data and numerical simulation data of the same construction stage, we study the impact of shield structure lateral passing on high-speed railway piers and surrounding ground surface in terms of the disturbance changes and the effect of isolation, as well as the effect of the lateral passing of the shield tunnel on the surface of the bridge piers and the surrounding area and the control effect of the isolation piles on the deformation. The results show that the isolation pile can block the development of the soil layer rupture surface and the stress path. The isolation pile has a good control effect on the vertical displacement of the bridge pier. The vertical displacement of the bridge pier decreases from 0.6 mm to 1.1 mm after the single- and double-track tunneling, and the displacement changes along the depth direction from non-uniform to relatively uniform. The vertical displacement of the ground surface includes both uplift and settlement, which occur at the same time. When the shield tunneling advances, the form of the ground settlement trough is changed from a “V” shape formed by the right single-track tunneling to a “W” shape after the double-track tunneling. The isolation pile can effectively control the influence range of tunnel excavation; its lateral displacement form changes regularly, and the lateral uplift is always in a “double-C outward expansion” shape. The initial excavation greatly disturbs the initial stress field, so it is necessary to pay attention to the control and management of measures to destroy the initial stress field.

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Section: Mechanism Of Isolation Pile Actionmentioning

confidence: 99%

Study on the restraint control of an isolation pile on an existing high-speed railway during the close passing of a shield machine

et al. 2023

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“…In this study, based on Möller and Vermeer (2008) [26], the constitutive model of soil strata was simulated as a Modified Mohr-Coulomb (MMC) model, also known as the Hardening Soil Model. It is worth mentioning that the tunnel is an unloading process and a dynamic excavation in the construction of the shield [27,29]. In contrast to the Mohr-Coulomb constitutive model, the MMC constitutive model may account for shear hardening.…”

Section: Constitutive Model and Model Parametersmentioning

confidence: 99%

Investigation on Existing Tunnel Response to Piles Construction: A Numerical Study

Ayasrah,

Fattah,

Hamood

2023

Civ Eng J

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Deep foundations are frequently built close to existing tunnels in the urban environment. Tunnels can only withstand very small movements. The construction of bored piles and/or the subsequent loading of the piles may result in unbearable movements or stresses that could result in cracking of the tunnel linings, which worries obstacles to the tunnel structure. This research presents an understanding of the interaction issue and investigates and evaluates various geometric factors that determine the effect of the construction of the pile on the existing tunnel. However, numerical modeling was established utilizing a modified Mohr-Coulomb constitutive model for the soil strata. Numerous factors have been examined, including different locations of the pile tip to the tunnel centerline as well as variable pile diameters and lengths. The numerical analysis results revealed that the bending moment decreases as the distance from the tunnel increases from 8 to 12 m and then remains constant, while the shear stress is not affected considerably. In addition, the shear stress and bending moment increase with pile diameter and length due to the increased confinement caused by the pile. The spacing has a considerable effect on the horizontal displacement with very little effect on the vertical displacement. Moreover, there is an increase in the shear force developed in the tunnel lining with pile diameter for different spacings between the tunnel and pile. This increase becomes smaller as the pile length increases. At small spacing between the pile and tunnel (8.3 m and 12.5 m), the bending moment in the tunnel lining decreases as the pile length increases. Doi: 10.28991/CEJ-SP2023-09-016 Full Text: PDF

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“…Extensive experimental and numerical simulations have carried out to investigate the lateral behavior of monopile under monotonic and cyclic horizontal loads. 3 – 25 The effects of the pile-soil relative stiffness, 6 – 9 pile diameter D, 15 , 16 soil relative density, 18 – 20 loading rate, 17 loading frequency, 5 loading amplitude, 21 loading direction (e.g. unidirectional or bidirectional), 22 – 24 the number of cycles, 6 existing vertical load, 25 and inclination angle 3 , 4 on the lateral behavior of pile were mainly focused.…”

Section: Introductionmentioning

confidence: 99%

Bearing and deformation characteristics of monopile foundation under monotonic and cyclic horizontal loads

Ma,

Xu,

Fan

et al. 2024

Science Progress

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The bearing and deformation characteristics of monopile foundation under the monotonic and cyclic loads are key factors to consider in the design of the transmission tower structure or offshore wind energy converters. The model tests and numerical simulations of monopile foundation under monotonic and cyclic horizontal loads were performed in sand to explore the bearing characteristics and the deformation characteristics of pile. The potentially affected factors including loading height, relative density of soil, displacement amplitude were analyzed. The results show that with the loading height varies from 1 D to 4 D, the horizontal static bearing capacity of the pile under different the soil relative density decreased by 1.63–1.9 times, and the peak bending moment increased by 22.9%–36.8%. Under the cyclic loads, the peak load on the pile top increased by 31.7%–56.1% for each 1 mm increase in displacement amplitude. The stiffness of soil around pile varies as the number of cycles increases with the development trend of decreases first and then increases gradually. As the horizontal load and cycle number increase, the range of the displacement of soil extends towards the bottom of pile, until it covers the entire lower part of the model.

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Numerical Study on the Reinforcement Measures of Tunneling on Adjacent Piles

Cited by 12 publications

References 32 publications

Study on the restraint control of an isolation pile on an existing high-speed railway during the close passing of a shield machine

Study on the restraint control of an isolation pile on an existing high-speed railway during the close passing of a shield machine

Investigation on Existing Tunnel Response to Piles Construction: A Numerical Study

Bearing and deformation characteristics of monopile foundation under monotonic and cyclic horizontal loads

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