Investigating the Deformation and Failure Mechanism of a Submarine Tunnel with Flexible Joints Subjected to Strike-Slip Faults

Zhou, Guangxin; Sheng, Qian; Cui, Zhen; Wang, Tianqiang; Ma, Yalina

doi:10.3390/jmse9121412

Cited by 26 publications

(7 citation statements)

References 28 publications

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“…Substituting the baseline value θ = 72° into formula (5), the sensitivity factor of the maximum deformation of the retaining pile is obtained as Pθ=0.462.…”

Section: Sensitivity Analysis Of Fault Dip Angle θmentioning

confidence: 99%

“…In urban engineering construction, the existence of special geological environments, such as active fault zones and fault slippage, has caused serious damage and threats to engineering [1][2][3][4]. The existence of fault slippage not only causes damage to engineering structures such as cross-fault buildings and underground engineering structures, but also poses a serious threat to the structural engineering in its affected area [5][6][7][8][9]. Excavation engineering located in the influence zone of a fault zone is easily affected by fault activity, leading to a series of adverse consequences such as displacement of the excavation support structure, uplift and cracking of the bottom plate, and damage to anti-seepage structural facilities.…”

Section: Introductionmentioning

confidence: 99%

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Study on the Deformation Effects of Foundation Pit Retaining Piles in the Influence Zone of the Footwall Affected by Reverse Fault

Niu,

Wang,

2023

Preprint

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In order to investigate the deformation characteristics of the retaining piles in the footwall affected by reverse fault, this study focuses on a case study of a foundation pit project in Shenzhen City, using numerical simulation methods. By analyzing the deformation characteristics of the retaining piles under reverse fault and investigating the influence of different fault slip amounts, dip angles, and positions on the pile deformation, sensitivity analysis and orthogonal experiments of fault parameters were conducted. The research results show that the deformation of the retaining piles under reverse fault exhibits an increasing trend, with the center of gravity shifting upward. Regarding the deformation impact, the upper part of the pile shows significantly larger deformation than the lower part, especially at the pile top. The overall deformation of the pile exhibits an approximate spoon-shaped curve, with the maximum deformation occurring in the middle to upper part of the foundation pit. The deformation of the pile is directly proportional to the fault slip amount and dip angle, while it is inversely proportional to the distance from the fault to the pit. Furthermore, the maximum deformation rate r(ΔZmax/Δ) increases non-linearly with increasing fault slip amount and dip angle, and decreases non-linearly with increasing distance from the fault to the foundation pit. Through sensitivity analysis of fault slip amount, dip angle, and position on the maximum deformation of the retaining pile, it is found that the dip angle has the greatest influence on deformation, followed by the slip amount, while the fault position has the least influence. By fitting the data from 64 orthogonal experiments, a good linear relationship is established between the maximum deformation Uhm of the retaining pile and the index η(\(\frac{{\theta \pi T}}{{{{180}^^\circ }S}}\) ). Furthermore, a predictive model is developed for the maximum deformation of the retaining pile in the influence zone of the footwall affected by reverse fault. This study provides valuable references for controlling deformations in foundation pit projects in reverse fault areas and holds significant importance for rational design and construction. The research findings contribute to reducing geological hazards, ensuring engineering safety, and promoting the sustainable development of foundation pit projects. Moreover, these contributions play a positive role in minimizing environmental impacts, resource consumption, and advancing the sustainability of engineering practices.

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“…Substituting the baseline value θ = 72° into formula (5), the sensitivity factor of the maximum deformation of the retaining pile is obtained as Pθ=0.462.…”

Section: Sensitivity Analysis Of Fault Dip Angle θmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Study on the Deformation Effects of Foundation Pit Retaining Piles in the Influence Zone of the Footwall Affected by Reverse Fault

Niu,

Wang,

2023

Preprint

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“…Many scholars have studied the problem of tunneling through various strata using numerical simulations and model tests [12][13][14][15][16]. In terms of model studies, Kawamata [17] conducted several shaking table tests on shield tunnels passing through soft and moderately stiff strata.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Construction Disturbances during Bidirectional Advancement of Undersea Large-Diameter Dual-Line Shield Tunneling

Wang,

Xiang,

Liu

et al. 2024

JMSE

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Relying on the Mawan undersea large-diameter, dual-line, mud–water-balanced shield tunnel project and focusing on the characteristics of the tunnel, such as the complex geological conditions at the expected intersection location and the existence of a superimposed perturbation or secondary perturbation effect, theoretical calculations and three-dimensional numerical simulations were used to reveal the ground disturbance situation of the large-diameter, two-lane mud–water shield when it is propelled under various working conditions. The working conditions were set for the dynamic intersection of the left and right lines, with stopping and moving as the two modes, and a traversing simulation was carried out under three conditions related to the strata. The results show that the surface settlement curve for the two-lane construction became a “W”-shaped bimodal curve due to the superposition effect; the dynamic intersection construction greatly disturbed the ground layer and there was a plastic zone expanding outward at a small angle above the tunnel, with shear damage in the soil layer and tensile damage in the rock layer. A “one line stops, and another advances” intersection can reduce the impact of disturbance; the surface settlement value after the completion of the advancement was smaller than the dual-line intersection. The surrounding rock stress and displacement under the advancement of a single shield machine did not change to a great degree, there was no obvious change in the surface settlement above the tunnel, and the effect of the secondary disturbance was small.

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“…Jiao et al [22] investigated the damage mechanism of tunnel-crossing faults under the action of obliquely incident seismic p-waves using numerical analysis. Zhou et al [23] established the Jiaozhou Bay Second Submarine Tunnel in Jiaozhou as a prototype with flexible joints, and used model tests and numerical simulation to study the deformation and failure mechanism of the submarine tunnel under the dislocation of the strike-slip fault. The results show that increasing the lining thickness, reducing the lining length, and reducing the tunnel diameter can effectively ensure tunnel safety.…”

Section: Introductionmentioning

confidence: 99%

Study on the Response of Tunnel Lining under Fault Dislocation

Bao

Feng

2023

Sustainability

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In order to clarify the influence of fault dislocation on tunnel lining, the FEM and single factor variable methods were used to explore the influence of the degree of fault dislocation, dip angle, width, the intersection angle between the strike and the tunnel axis, and the fault dislocation form on the lining structure response, based on which length of the lining anti-dislocation set-up for engineering design was obtained. The research shows that the maximum displacement of the lining is basically consistent with the fault displacement; with the increase of the fault width, the overall fortification range of the tunnel increases. Among the three types of fault dislocation, the axial force of the lining caused by reverse fault dislocation is the largest, the level of normal fault is the moderate, and the strike-slip fault is the smallest. With the increase of the intersection angle between the fault strike and the tunnel axis, the lining gradually changes from tension-shear failure to shear failure. It is suggested that the tunnel should cross the fault at a large angle as far as possible. If it is unavoidable to cross the fault when selecting the tunnel route in the project, the tunnel axis should be selected to cross the fault vertically as far as possible.

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Investigating the Deformation and Failure Mechanism of a Submarine Tunnel with Flexible Joints Subjected to Strike-Slip Faults

Cited by 26 publications

References 28 publications

Study on the Deformation Effects of Foundation Pit Retaining Piles in the Influence Zone of the Footwall Affected by Reverse Fault

Study on the Deformation Effects of Foundation Pit Retaining Piles in the Influence Zone of the Footwall Affected by Reverse Fault

Numerical Simulation of Construction Disturbances during Bidirectional Advancement of Undersea Large-Diameter Dual-Line Shield Tunneling

Study on the Response of Tunnel Lining under Fault Dislocation

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