Analytical solution for the response of an existing tunnel induced by above-crossing shield tunneling

Liu, Bo; Yu, Zhiwei; Han, Yanhui; Wang, Zhiliu; Zhang, Ronghui; Wang, Shijie

doi:10.1016/j.compgeo.2020.103624

Cited by 41 publications

(17 citation statements)

References 33 publications

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“…The research methods to investigate the mechanical characteristics, e.g., stress state, deformation pattern of shield tunnels include theoretical analysis [13][14][15], numerical simulations [1,2,16,17], field monitoring [2][3][4][5], and model tests [18][19][20][21]. The combination of the cross passages and main tunnels is a complex three-dimensional structure, which is unrealistic to utilize classical theoretical methods such as beam-spring models or homogeneous ring models to perform analysis.…”

Section: Introductionmentioning

confidence: 99%

Centrifugal Model Test Study on the Mechanical Characteristics of Shield Tunnels Influenced by Different Types of Openings for Cross Passages

Yuan

Luo

et al. 2022

Applied Sciences

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To investigate the mechanical characteristics of shield tunnels when openings are made for the construction of cross passages, a series of centrifugal model tests were conducted. The segmental features of the shield tunnel were simulated in the tests, and the influence of different types of openings, namely, rectangular opening, small circular opening, and big circular opening was compared. External earth pressures, structural deformations, dislocations, and structural stresses were monitored during the tests, while the influence of different buried depths was also investigated. The results show that (1) soil arching effect occurred in the overlying soil due to the deformation of the tunnel, and the earth pressure reduction coefficients can guide the tunnel structural design; (2) vertical deformations of the main tunnel and the dislocations between adjacent rings increased with the opening sizes significantly; (3) significant stress concentration occurred close to the openings, and the compressive stress at the inner surface may even exceed the limit strength of the concrete. In summary, the adverse responses of the tunnel increased with the increase of the buried depth and the opening size. Targeted measures should be taken, such as temporary support, longitudinal connections, and high-strength materials near the openings.

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Section: Introductionmentioning

confidence: 99%

Centrifugal Model Test Study on the Mechanical Characteristics of Shield Tunnels Influenced by Different Types of Openings for Cross Passages

Yuan

Luo

et al. 2022

Applied Sciences

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“…Living pile lines, hidden buildings and building foundations are intricately distributed. Shield tunnelling will disturb these existing structures, resulting in settlement, deformation and even cracking of existing structures, posing a significant threat to the safe use of existing structures (Li et al, 2019;Huang et al, 2020;Lin et al, 2020;Liu et al, 2020;Miao et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Calculation of surface settlement and pile foundation deformation caused by shield machine tunnelling along curve section

et al. 2022

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The shield machine tunnelling along the curve section causes more disturbance to the surrounding environment than the straight section. Pile foundation is the most commonly used foundation form in high-rise buildings, and high-rise buildings have extremely high requirements for controlling non-uniform deformation. Therefore, it is necessary to study the surface settlement and the deformation law of pile foundations caused by shield machine tunnelling along the curve section. Considering the shield machine tunnelling factors along the curve section and the coupling effect of piles and soil, the analytical calculation formula of the ground settlement and the pile foundation deformation caused by the shield machine tunnelling along the curve section is deduced. According to the actual project situation, a finite difference model (FDM) is constructed, and the correctness of the FDM and analytical prediction formula is verified by comparing the on-site monitoring data. The research shows that the error among the FDM results, the analytical prediction results, and the on-site monitoring data are small, and the surface settlement and pile foundation deformation meet the construction control standards. The friction resistance of the shield shell, the integrative gap at the shield tail (IGST), and the over-cutting gap (OG) are the main factors leading to the surface settlement. However, the shield shell friction and OG are the main reasons leading to the inner settlement of the curve section being more prominent than the outer side. The difference in the pile foundation settlement on both sides of the curve section is slight, the maximum settlement difference rate is 1.8%, and the maximum horizontal deformation rate of the pile foundation on the inner and outer sides is 9.2%, which shows that the horizontal deformation of the pile foundation is more sensitive to the asymmetrically distributed construction factors.

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“…In previous studies on overlapped tunnels, scholars mainly discussed the construction mechanical characteristics of overlapped tunnels and have already made some achievements in the statics of the cross tunnel in terms of the distribution of mechanical characteristics, reinforcement technology, and monitoring and measurement [7][8][9][10][11][12][13][14][15][16][17]. Some scholars have analyzed the mechanical characteristics and stability of the surrounding rock of the cross tunnel with a small clear distance through different numerical software; the results showed that the maximum displacement at the crown was caused by the construction disturbance and the release of the stress of the crown [10,11].…”

Section: Introductionmentioning

confidence: 99%

“…Some scholars have analyzed the mechanical characteristics and stability of the surrounding rock of the cross tunnel with a small clear distance through different numerical software; the results showed that the maximum displacement at the crown was caused by the construction disturbance and the release of the stress of the crown [10,11]. Liu et al and Lin et al [12,13] conducted a theoretical analysis and numerical simulation study on the construction process of the overlapped subway tunnel with a small clear distance. ey pointed out that when a new tunnel was constructed over the span, the additional stress generated was mainly concentrated in the original tunnel area at the intersection of the tunnel.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Response of Parallel Overlapped Tunnel under Seismic Loading by Shaking Table Tests

Yang

Rao

Wu³

et al. 2021

Shock and Vibration

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Potential earthquake-induced damage to overlapped tunnels probably occurs during the operation and maintenance of mountain tunnel engineering, especially in the seismically active zone. This study investigated the dynamic response and the failure characteristics of the parallel overlapped tunnel under seismic loadings by employing shaking table tests. The failure mode of the parallel overlapped tunnels was analyzed through macroscopic test phenomena. The dynamic responses of the surrounding rock and tunnel lining were evaluated by acceleration and dynamic strain, respectively. In particular, wavelet packets were used to investigate the spectrum characteristics of the tunnel structure in depth. The failure process of the model can be divided into three stages. The upper-span and the under-crossing tunnels showed different failure characteristics. Additionally, the lining damage on the outer surface of the tunnel mainly occurred on the right side arch waist and the left side wall, whereas the lining damage on the inner surface of the tunnel mainly appeared on the crown and invert. Wavelet packet energy results showed that the energy characteristic distributions of the upper-span and the under-crossing tunnels were not consistent. Specifically, the energy eigenvalues of the crown of the upper-span tunnel and the invert of the under-crossing tunnel were the largest, which should be considered to be the weak parts in the seismic design.

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Analytical solution for the response of an existing tunnel induced by above-crossing shield tunneling

Cited by 41 publications

References 33 publications

Centrifugal Model Test Study on the Mechanical Characteristics of Shield Tunnels Influenced by Different Types of Openings for Cross Passages

Centrifugal Model Test Study on the Mechanical Characteristics of Shield Tunnels Influenced by Different Types of Openings for Cross Passages

Calculation of surface settlement and pile foundation deformation caused by shield machine tunnelling along curve section

Dynamic Response of Parallel Overlapped Tunnel under Seismic Loading by Shaking Table Tests

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