Behavior of shallow tunnel in soft soil under seismic conditions

Patil, Milind; Choudhury, Deepankar; Ranjith, P.G.; Zhao, Jian

doi:10.1016/j.tust.2018.04.040

Cited by 94 publications

(30 citation statements)

References 24 publications

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“…where e is the void ratio of soil. As shown in Figure 3, by increasing the strain amplitude, the values of the undrained Young's modulus decrease, and this decreasing trend is proportional to Equation (11) [34]:…”

Section: Determination Of σ 0 and γ Omentioning

confidence: 90%

Analysis of Undrained Seismic Behavior of Shallow Tunnels in Soft Clay Using Nonlinear Kinematic Hardening Model

Asheghabadi

Cheng

2020

Applied Sciences

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In this study, a soil–tunnel model for clay under earthquake loading is analyzed, using finite element methods and a kinematic hardening model with the Von Mises failure criterion. The results are compared with those from the linear elastic–perfectly plastic Mohr–Coulomb model. The latter model does not consider the stiffness degradation caused by imposing cyclic loading and unloading to the soil, whereas the kinematic hardening model can simulate this stiffness degradation. The parameters of the kinematic hardening model are calibrated based on the results of experimental cyclic tests and finite element simulation. Here, two methods—one using data from cyclic shear tests, and the other a new method using undrained cyclic triaxial tests—are used to calibrate the parameters. The parameters investigated are the peak ground acceleration (PGA), tunnel lining thickness, tunnel shape, and tunnel embedment depth, all of which have an effect on the resistance of the shallow tunnel to the stresses and deformations caused by the surrounding clay soils. The results show that unlike traditional models, the nonlinear kinematic hardening model can predict the response reasonably well, and it is able to create the hysteresis loops and consider the soil stiffness degradation under the seismic loads.

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Section: Determination Of σ 0 and γ Omentioning

confidence: 90%

Analysis of Undrained Seismic Behavior of Shallow Tunnels in Soft Clay Using Nonlinear Kinematic Hardening Model

Asheghabadi

Cheng

2020

Applied Sciences

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“…Shahrour and Khoshnoudian et al [15] numerically studied the seismically-induced bending moments and soil dilatancy around tunnels in soft soils. Patil and Choudhury et al [16] performed FEM on circular tunnels and studied the lining distortions, bending moments under variable ground vibrations, and different embedment depth and tunnel lining thickness to develop better understanding of tunnel behavior in soft soils. Tsinidis [17] conducted FEM to study response characteristics of rectangular tunnels under seismic shaking varying the tunnel-soil interface properties and input motion characteristics embedment depths and concluded in the development of racking-flexibility (RF) relations for rectangular tunnels in soft soils.…”

Section: Of 22mentioning

confidence: 99%

“…Hence, it is compared with a reference model. The reference model considered in this case is taken from the research of Milind and Choudhury et al [16]. It comprises of a circular tunnel with a diameter of 6 m analyzed using FEM software Plaxis 2D under different seismic vibrations.…”

Section: Reference Modelmentioning

confidence: 99%

“…In this study, the FEM program Plaxis 2D is used, which offers a wide range of constitutive models and different modules to numerically analyze both the linear and non-linear behavior of the soil and tunnel structure. A layered soil system is considered to have a soft silty clay layer underlain by silty clay, very soft silty clay, clay, and silty clay with silty sand, respectively, as used by Hu and Yue et al [30] along with Milind and Choudhury et al [16]. The soil media is taken as fully saturated with the GWT considered to be at the ground level.…”

Section: Software and Soil Parametersmentioning

confidence: 99%

“…The soil tunnel system is modeled using Plaxis 2D, considering the Mohr-Coulomb constitutive model for the soils used by many other researchers [16,30,32]. In order to use for the dynamic analysis, Plaxis 2D makes use of the modified Mohr-Coulomb constitutive model.…”

Section: Constitutive Model and Boundary Conditionsmentioning

confidence: 99%

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Seismic Behavior of Triple Tunnel Complex in Soft Soil Subjected to Transverse Shaking

et al. 2020

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Combining multiple tunnels into a single tunnel complex while keeping the surrounding area compact is a complicated procedure. The condition becomes more complex when soft soil is present and the area is prone to seismic activity. Seismic vibrations produce sudden ground shaking, which causes a sharp decrease in the shear strength and bearing capacity of the soil. This results in larger ground displacements and deformation of structures located at the surface and within the soil mass. The deformations are more pronounced at shallower depths and near the ground surface. Tunnels located in that area are also affected and can undergo excessive distortions and uplift. The condition becomes worse if the tunnel area is larger, and, thus, the respective tunnel complex needs to be properly evaluated. In this research, a novel triple tunnel complex formed by combining three closely spaced tunnels is numerically analyzed using Plaxis 2D software under variable dynamic loadings. The effect of variations in lining thickness, the inner supporting structure, embedment depth on the produced ground displacements, tunnel deformations, resisting bending moments, and the developed thrusts are studied in detail. The triple tunnel complex is also compared with the rectangular and equivalent horizontal twin tunnel complexes in terms of generated thrusts and resisted seismic-induced bending moments. From the results, it is concluded that increased thickness of the lining, inner structure, and greater embedment depth results in decreased ground displacements, tunnel deformations, and increased resistance to seismic-induced bending moments. The comparison of shapes revealed that the triple tunnel complex has better resistance against moments with the least amount of thrust and surface heave produced.

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Seismic response analysis of monopile wind turbine under obliquely incident seismic waves

Wang,

Lu,

Gao

et al. 2024

Earthquake Engineering and Resilience

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When the seismic source is shallow or the wind turbine structure is moderately distant from the epicenter, it is necessary to consider the oblique incidence of planar body waves. To investigate the dynamic response law of wind turbine structures under oblique seismic wave incidence, this study establishes an integrated approach for analyzing the dynamic response of wind turbine structures considering oblique seismic wave incidence, incorporating one‐dimensional time‐domain site response analysis and viscoelastic artificial boundaries. By using the above seismic input method, the dynamic response law of a 5 MW monopile wind turbine under the obliquely incident P and SV waves are analyzed in detail when different characteristics, incident angles, propagation angles and vibration directions of waves are considered. Numerical studies show that the above factors have an important influence on the seismic response of the wind turbine structure.

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Behavior of shallow tunnel in soft soil under seismic conditions

Cited by 94 publications

References 24 publications

Analysis of Undrained Seismic Behavior of Shallow Tunnels in Soft Clay Using Nonlinear Kinematic Hardening Model

Analysis of Undrained Seismic Behavior of Shallow Tunnels in Soft Clay Using Nonlinear Kinematic Hardening Model

Seismic Behavior of Triple Tunnel Complex in Soft Soil Subjected to Transverse Shaking

Seismic response analysis of monopile wind turbine under obliquely incident seismic waves

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