Effects of the friction coefficient and location of the dislocation surface of an active fault on the mechanical response of a freeway tunnel

Zhao, Wang; Gao, Hongshuai; Chen, Weizhong; Jiguo, Liu; Peng, Wenbo; Zhou, Shuai

doi:10.1007/s12665-023-10975-3

Cited by 7 publications

(2 citation statements)

References 33 publications

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“…The Coulomb friction law using the penalty method is adopted to simulate the tangential behaviour of the interface. Table 6 lists the physical and mechanical properties of the materials used in the model 41 .…”

Section: Finite Element Analysismentioning

confidence: 99%

Dislocation response of ECC-RC composite supporting structures of tunnels passing through active fault

Wang,

Ding,

Shi

et al. 2024

Sci Rep

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To address the problems of the conventional composite supporting structures (CCSSs) such as insufficient anti-dislocation performance and deformation capacity, this study used Engineered Cementitious Composite (ECC) lining sections instead of the traditional lining sections and optimized support design parameters, resulting in the development of novel ECC-RC composite supporting structures (ECSSs) of tunnels passing through active fault. The dislocation response characteristics and their parameter sensitivity of the ECSS was revealed by way of 1/25-scale fault dislocation model tests and finite element analysis. The test results show that the mechanical response characteristics and the failure modes of the CCSS and the ECSS are similar under reverse fault dislocation. Compared with the CCSS, the anti-dislocation performance of the ECSS is significantly improved by introducing of the ECC lining and optimizing the design parameters. The vertical deformation of the ECSS and the range of influence under the same dislocation are significantly decreased, and the strain are reduced to different degrees. This phenomenon shows that by improving the material properties, shortening the spacing of aseismatic joints and optimising the thickness of the shock absorption layer, the stress conditions and applicability under deformation of the structure are improved. The ECSS benefits from the crack resistance and toughening effect of fibres, the degree and scope of cracking of the ECSS are significantly reduced compared with those of the CCSS, and internal and external through cracks and local spalling are absent. The results of finite element analysis show that the overall damage degree of the ECSS is decreased and the damage range is increased by decreasing the strength of the surrounding rock in the fault zone. The fault dislocation response pattern of the ECSS varies depending on the fault type. The damage degree caused by different fault types follows the order of normal fault, strike-slip fault, and reverse fault from large to small. However, the damage range caused by the strike-slip fault is significantly larger compared to normal fault and reverse fault. In the design of fault resistance, the surrounding rock conditions of the fault zone and the form of fault dislocation should be considered.

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Section: Finite Element Analysismentioning

confidence: 99%

Dislocation response of ECC-RC composite supporting structures of tunnels passing through active fault

Wang,

Ding,

Shi

et al. 2024

Sci Rep

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show abstract

“…It means that when the contact pressure becomes zero or negative, the two contact surfaces separate, removing the contact constraint between them. In the tangential direction, the shear behavior of the interface can be modeled by the Coulomb friction law, which can be expressed as: In this study, it is assumed that the friction coefficient µ between the surrounding rock and the lining is 0.6 [29]. Where τ crit is the critical value of the contact shear stress, µ is the friction coefficient, and p is the contact compressive stress.…”

Section: Finite Element Model Analysismentioning

confidence: 99%

Study of Mechanical Response of Tunnels Crossing Active Faults in Different Burial Depths

Zhang,

Zhao,

Cui

2023

Buildings

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There are numerous tunnels worldwide that cross active fault zones. These tunnels are situated in complex geological environments and are subjected to intense seismic activities. When active fault zones experience displacement, tunnels are susceptible to varying degrees of damage. Over the past few decades, many scholars have researched tunnels crossing active fault zones using numerical simulation methods, including finite element analysis, discrete element analysis, and finite difference methods. However, certain aspects have been overlooked, such as the influence of burial depth on tunnels crossing active fault zones. Most prior studies have primarily omitted consideration of tunnel depth and high-stress effects, resulting in disparities between research findings and practical engineering outcomes. In light of these issues, this paper analyzes the impact of ground stress fields at different burial depths on tunnels crossing active fault zones. It compares the mechanical response characteristics of deep-buried and shallow-buried tunnels after experiencing fault displacement, elucidating variations in displacement patterns, stress, and strain at different burial depths. The results indicate that: (1) Deep-buried and shallow-buried tunnels exhibit an “S”-shaped deformation pattern. (2) Regarding the strain distribution within the tunnel, the affected regions are predominantly concentrated within the fault zone. (3) Regarding the stress distribution within the tunnel, deep-buried tunnels experience a broader range of stress variations distributed across the fault zone. In contrast, shallow-buried tunnels predominantly exhibit stress concentration at the fault slip plane. (4) By analyzing the patterns of tunnel damage at different burial depths, it is observed that burial-depth effects notably influence tunnels with a burial depth less than 200 m. In comparison, tunnels exceeding 300 m gradually reduce the impact of burial depth. These findings can be essential theoretical references for studying tunnels crossing active fault zones in deep-buried environments.

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Analysis of Stress Evolution Characteristics of Surrounding Rock in Deep-buried Tunnels Crossing Fault Zone

Chen,

Jiang,

Shi

2024

KSCE J Civ Eng

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Effects of the friction coefficient and location of the dislocation surface of an active fault on the mechanical response of a freeway tunnel

Cited by 7 publications

References 33 publications

Dislocation response of ECC-RC composite supporting structures of tunnels passing through active fault

Dislocation response of ECC-RC composite supporting structures of tunnels passing through active fault

Study of Mechanical Response of Tunnels Crossing Active Faults in Different Burial Depths

Analysis of Stress Evolution Characteristics of Surrounding Rock in Deep-buried Tunnels Crossing Fault Zone

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