Investigations of seismic response to an irregular-section subway station structure located in a soft clay site

Tang, Baizan; Li, Xiaojun; Chen, Su; Hu, Zhuang; Chen, Hua-Peng

doi:10.1016/j.engstruct.2020.110799

Cited by 30 publications

(12 citation statements)

References 53 publications

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“…In the equation, R b is the coefficient for evaluating the effectiveness of the damping layer; R b = 1 − µ l,b /µ l,s , µ l,b and µ l,s are the maximum deformation values of the outer surface of the lining structure under the deformation effects of the damping layer and the surrounding rock; r 0 /H is the ratio of the internal diameter of the lining structure to the burial depth; t 0 /r 0 is the ratio of the thickness of the damping layer to the internal diameter of the lining structure; Eb/Es is the ratio of the elastic modulus between the damping layer and the surrounding rock; ν b is the Poisson's ratio of the damping layer; and ν s is the Poisson's ratio of the surrounding rock [31].…”

Section: Evaluation Methods For Damping Layer Performancementioning

confidence: 99%

Evaluation of the Damping Layer between the Tunnel Lining and Surrounding Rock via a Shaking Table Test

Wen,

Zhou,

et al. 2023

Sustainability

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This paper primarily investigates the protective effect of the damping layer in tunnel lining structures under dynamic loads. A series of shaking table tests was conducted to investigate the seismic response mechanism of tunnel linings and the influence of surrounding rocks using the Wenchuan earthquake (magnitude 8.0) as a reference. The results show that the effect of the damping layer protection measures is accurate using the efficiency evaluation method for the damping layer under seismic excitation. The lower the excitation acceleration is, the better the effect will be. In addition, the damping coefficient is introduced to optimize the efficiency evaluation method for the damping layer. Among the factors influencing the seismic response of lining structures, the type of surrounding rock has a significant impact while the thickness of the damping layer has a relatively lesser influence. In seismic intensity areas of equal magnitude, an increase in the damping layer thickness leads to a more noticeable effect. In the different seismic intensity areas, the difference in the protection effect with the change in thickness is no longer obvious with the increase in seismic intensity. Moreover, the presence of a damping layer alters the intrinsic vibration characteristics of the tunnel lining structure, creating a space for deformation between the lining and the surrounding rock.

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Section: Evaluation Methods For Damping Layer Performancementioning

confidence: 99%

Evaluation of the Damping Layer between the Tunnel Lining and Surrounding Rock via a Shaking Table Test

Wen,

Zhou,

et al. 2023

Sustainability

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“…Other studies have focused on the analysis of structural internal force (Chen and Liu, 2018, Lei and Yong, 2020, Miao et al, 2020, Xu et al, 2020. Tang et al, (2020) conducted a shaking table test and found that the components of the bottom layer of a deep underground subway station construction, particularly the middle column, experienced cumulative damage, and other studies reported similar results , Miao et al, 2020. Seismic damage to underground structures in soft soil sites may be greater than that in liquefied sand sites .…”

Section: Introductionmentioning

confidence: 99%

Analysis of the seismic performance of a large underground station structure in complex stratum considering the influence of axial force

Bao,

Liu,

Shen

et al. 2023

Advances in Structural Engineering

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The large underground structure in saturated stratum is vulnerable to float during an earthquake. This results in a plethora of problems, such as uneven settlement, large internal force and structure damage. In this study, the seismic behavior of a three-story, two-span subway station in complex saturated stratum was investigated through water-soil fully coupled 3D finite element method. In the analysis, the nonlinear soil behavior was described by a cyclic mobility model and the structure was calculated using a nonlinear constitutive model which can consider the influence of axial force on its bending moment. Joints elements were used to model the contact surface between soil and structure. The development of the soil displacement and internal force of the station structure at different times during a huge earthquake was examined. The bearing capacity of the station structure members was analyzed. The results indicated that the vertical displacement was spatially distributed. The larger additional seismic stresses appeared in the bottom slab and side wall. Failed elements were observed in both the walls and slabs, and the walls were more easily damaged than the slab. The results provide useful reference for the large underground structure seismic design in the construction of urban underground space.

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“…The relative position of the stiff layer in relation to the vicinity of the aperture has a major impact on the stability of the tunnel liner [2,5,[18][19][20]. Tang et al [21] investigated the dynamic interaction that occurs between silty-clay soil and an irregular-section subway station. The findings indicated that the motion of the subway station was mostly affected by the characteristics of the adjacent silty-clay soil, specifically in relation to its phase and amplitude.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Study of Soil Strata for Underground Transportation System: A Case Study

Alqawas,

Sadique,

Mohammad

et al. 2024

Civ Eng J

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In the current capital of Yemen, Sana’a, a time-efficient and economical transportation system is one of the greatest challenges to overcome the increasing urbanization for many years. Rapid transport systems use tunnel structures to reach the city's most inaccessible areas. Given the Gulf's geopolitical unrest, these structures could also serve as emergency shelters. Consequently, this research conducted an experimental soil exploration investigation in Sana'a, Yemen, to identify potential tunneling sites for the city's rapid transit system. The field exploration, in-situ, and laboratory soil testing at the four locations were performed with the collaboration of the Ministry of Public Works & Highways, Yemen. Further, to calculate the geotechnical parameters for tunnel design, numerical analysis has been carried out using the finite element package ABAQUS, and two-dimensional plane-strain numerical models of underground tunnel structure have been developed to conduct the parametric study in different soil types and boundary conditions under static loading. The material behavior of soil strata has been incorporated into the well-known Mohr-Coulomb constitutive model. The field investigation found that the geotechnical properties of the soil strata in Sana’a have a lot of variation. The numerical study shows that the maximum deformation in the concrete liner of the tunnel was observed at the crown of the tunnel. The ovalling effect in tunnel concrete liner was also seen in all the tunnel models, and the maximum ground settlement at sites 1, 2, 3, and 4 was estimated to be approximately 4, 25, 17, and 11 mm, respectively. Doi: 10.28991/CEJ-2024-010-01-03 Full Text: PDF

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Investigations of seismic response to an irregular-section subway station structure located in a soft clay site

Cited by 30 publications

References 53 publications

Evaluation of the Damping Layer between the Tunnel Lining and Surrounding Rock via a Shaking Table Test

Evaluation of the Damping Layer between the Tunnel Lining and Surrounding Rock via a Shaking Table Test

Analysis of the seismic performance of a large underground station structure in complex stratum considering the influence of axial force

Experimental and Numerical Study of Soil Strata for Underground Transportation System: A Case Study

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