3-D shell analysis of structure in portal section of mountain tunnel under seismic SH wave action

Tao, Lianjin; Hou, Shifeng; Zhao, Xu; Qiu, Wenge; Li, Tianbin; Liu, Chunxiao; Wang, Ke

doi:10.1016/j.tust.2014.11.001

Cited by 35 publications

(5 citation statements)

References 15 publications

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“…This is mainly because the portal slope has reflection action on the seismic wave. Meanwhile, the reflected wave produces waveform conversion phenomenon, which leads to the complex wave field in the 0 m-48 m section; thus the seismic response of the lining is affected [25]. As seen in Figure 8, -peak displacements variation of the lining parts show a similar law as that of directional.…”

Section: Displacement Analysis Of Liningmentioning

confidence: 88%

Dynamic Response Simulation of Lining Structure for Tunnel Portal Section under Seismic Load

Liu

Chen

Xiao

et al. 2018

Shock and Vibration

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Portal section is the weak link of seismic fortification for tunnel structure. Assuming that seismic wave is the vertical incident elastic plane wave, the plane wave input method for the portal section was discussed in this paper; that is, the wave input problem can be converted to the problem of calculating equivalent nodal force at artificial boundaries. Based on different damage evolution processes of concrete under tension and compression conditions, the tension and compression damage variables were defined and solved, respectively. And then a simple elastic dynamic damaged constitutive model for concrete lining was built. According to the characteristics of dynamic interaction between the lining and rock, and based on the dynamic contact force algorithm, an analytical model for joint loading between the lining and rock was built. This model can simulate lining features such as bond, separation, and slip under seismic load. The dynamic response characteristics of lining structure for the portal section under seismic load were analyzed by taking example for an exit section of Dianzhong diversion project in strong earthquake area. The results show that the relative displacement magnitudes of the lining parts are related to the vibration direction of the seismic wave, and the peak displacements decrease gradually to the fixed values from the portal to the interior. The damage coefficients of the lining parts accumulate gradually over time, and the farther the lining is away from the portal, the less serious the seismic damage is. The separation and slip zone distributions of the lining are basically consistent with its severe seismic damage area, which are mainly at haunch, spandrel, and arch foot within a certain range of distance from the portal. The seismic fortified length and key fortified parts of tunnel structure for the portal section can be determined according to the calculation results.

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Section: Displacement Analysis Of Liningmentioning

confidence: 88%

Dynamic Response Simulation of Lining Structure for Tunnel Portal Section under Seismic Load

Liu

Chen

Xiao

et al. 2018

Shock and Vibration

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show abstract

“…The elastic constitutive model was commonly used for the lining structures (Amorosi and Boldini 2009;Tao et al 2015;Yu et al 2016). However, the internal structure of concrete is complex both in macro and micro sizes.…”

Section: Constitutive Model Of Concrete Liningmentioning

confidence: 99%

Application of two-level design method on subway tunnel crossing active fault: a case study on Urumqi subway tunnel intersected by reverse fault dislocation

Tao

Han

et al. 2021

Bull Eng Geol Environ

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The tunnel crossing active fault is severely damaged under the action of fault dislocation. Considering the "economic and safety" principle in engineering design, the tunnel damage should be effectively reduced. In this work, a two-level design method for fault dislocation was proposed and the Urumqi subway tunnel in China was chosen as a typical model to deeply investigate its application feasibility. Based on the definition of the design events of different levels and corresponding design goals, threedimensional finite element soil-tunnel models were established to estimate the response of tunnel. Meanwhile, the rationality of soil-tunnel model was judged by tunnel deformation and internal forces distribution characteristics analysis, and the two-level design goals were evaluated by comparing tunnel damage degree and volumes. The results suggest that under the condition of fault dislocation, the tunnel without disaster mitigation method suffers severely shear, tensile-crack, and compressive damage, which may eventually induce the tunnel collapse. The tunnel damage is reduced significantly by adopting the method of flexible joint. For Urumqi subway tunnel with flexible joints, both of the two-level design goals are effectively realized.

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“…Wang et al [14] studied the seismic response of the tunnel by a series of shaking table tests. Tao et al [15] conducted shaking table tests to verify the analytical solution of the single free surface slope model, which can provide a reference for the seismic design of the tunnel portal section in mountainous areas and had a positive impact on the reasonable interpretation of the seismic response characteristics of this section. Moreover, there is no systematic research on the acceleration response and stress-strain relationship of tunnel structures caused by near-fault ground motion [16,17].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of Dynamic Responses of Special Tunnel Sections under Near-Fault Ground Motion

et al. 2023

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Data surveys show that near-fault ground motion does great damage to tunnel structures, especially the portal section and fault zone. In this paper, a series of shaking table model tests of near-fault tunnels were conducted and the surrounding-rock fault-zone-lining model of the near-fault tunnel was established. Accelerometers and strain gauges were arranged at specific locations, and the experimental process of earthquake occurrence was simulated by inputting seismic waves of different working conditions, which obtained the characteristics of stress, damage and deformation of the tunnel model. The tested results showed that the acceleration response of the tunnel portal section was close to the wave shape of the inputted seismic wave, and the acceleration response of the arch shoulder, arch waist and arch foot was more prominent. The internal force of lining at the arch shoulder and arch foot was greater than that at the arch crown, and the peak internal force appeared at the arch foot. The internal force and the maximum or minimum principal stress of the lining under impulse ground motion were larger than those under non-impulse ground motion. Additionally, the surrounding rock had a filtering effect on the high-frequency band of seismic waves. Meanwhile, when the geological characteristics of the fault zone were poor, and the tensile damage first appeared at the arch foot, the compressive damage appeared at the junction of the surrounding rock and fault zone. This study will offer a practical guidance for tunnel engineering earthquake damage.

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3-D shell analysis of structure in portal section of mountain tunnel under seismic SH wave action

Cited by 35 publications

References 15 publications

Dynamic Response Simulation of Lining Structure for Tunnel Portal Section under Seismic Load

Dynamic Response Simulation of Lining Structure for Tunnel Portal Section under Seismic Load

Application of two-level design method on subway tunnel crossing active fault: a case study on Urumqi subway tunnel intersected by reverse fault dislocation

Experimental Study of Dynamic Responses of Special Tunnel Sections under Near-Fault Ground Motion

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