Impact of incident angles of P waves on the dynamic responses of long lined tunnels

Huang, Jian; Du, Xiuli; Jin, Liu; Zhao, Mi

doi:10.1002/eqe.2772

Cited by 83 publications

(31 citation statements)

References 32 publications

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“…Recently, many artificial boundary conditions have been proposed [39][40][41], among them, the viscous-spring artificial boundary has attracted more attention [42][43][44] due to its good stability and high accuracy, which takes into account the elastic resilience of the medium and overcomes the low-frequency instability of the viscous boundary. As shown in Figure 3, the essence of the viscous-spring artificial boundary is a parallel spring-dashpot system with continuous distribution applied on the boundary node, the coefficient of the spring and the coefficient of damping can be expressed as follows [13]: In addition, the peak accelerations of six seismic records were uniformly adjusted to 0.2 g in order to avoid being affected by earthquake amplitude, and Table 1 shows the properties of selected seismic records. Figure 1 shows the time-history curves of acceleration, velocity, and displacement of seismic records.…”

Section: The Viscous-spring Artificial Boundarymentioning

confidence: 99%

“…On the basis of Equation 3, this method has been extended to obliquely incident P waves. According to the research results of previous scholars [12,13,46,47], the principles of the wave input method are integrated and redefined according to the previous formulas. The obliquely incident P waves shear and squeeze when passing through the boundary, and therefore they not only generate reflected P waves but also reflected SV waves, assuming that incident P waves propagate obliquely from the bottom left corner, i.e.…”

Section: The Viscous-spring Artificial Boundarymentioning

confidence: 99%

“…It is now generally accepted that the traditional uniform seismic motion input method would overestimate the response of the dam [11]. Moreover, many studies have confirmed that quite different responses in infrastructures can occur under the non-uniform motion caused by oblique incidence [12][13][14]. According to the current research status, it is necessary to further analyze the behavior of a dam under near-fault earthquakes.…”

Section: Introductionmentioning

confidence: 99%

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Nonlinear Dynamic Response of a CC-RCC Combined Dam Structure under Oblique Incidence of Near-Fault Ground Motions

Zhang

et al. 2020

Applied Sciences

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The velocity pulse contained in near-fault ground motions have a tremendous impact on dam safety. Previous studies have mainly focused on the response of dams under near-fault seismic records without considering the obliquely incident seismic waves. In this study, the structure–soil interaction (SSI) is taken into consideration, and the nonlinear behavior of a conventional concrete roller-compacted concrete (CC-RCC) gravity dam under near-fault pulse records and non-pulse records is investigated with consideration of the obliquely incident P waves. On the basis of the dam site conditions, three groups of near-fault pulse records are chosen, and three corresponding non-pulse records are fitted by their acceleration response spectra. Combining with the viscous-spring artificial boundary, the wave input method is proposed to transform the near-fault seismic records into the equivalent nodal forces at the boundary of the foundation. The concrete damaged plasticity model is used for the nonlinear analysis. The results show that the pulse ground motions are more destructive than the non-pulse motions. The nonlinear behavior of the dam varies with the incidence angle of P waves and generally reaches a maximum at 60° and 75°, the worst damage occurs at the interface between different materials of the dam, and the spatial variation of its damage is very obvious under near-fault seismic records with various incidence angles. Therefore, the effect of the angle of obliquely incident seismic waves and near-fault pulse effect should be considered comprehensively in the seismic analysis of dams.

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Section: The Viscous-spring Artificial Boundarymentioning

confidence: 99%

Section: The Viscous-spring Artificial Boundarymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Nonlinear Dynamic Response of a CC-RCC Combined Dam Structure under Oblique Incidence of Near-Fault Ground Motions

Zhang

et al. 2020

Applied Sciences

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“…Naggar et al [30] investigated the effects of the seismic input angle on the moments and thrusts of cylinder tunnel linings by a proposed analytical procedure. An input method of P waves and SV waves was proposed by Huang et al [24,31] to analyze the impacts of incident angles on the seismic behaviors of the lined tunnel. More relevant works can be found in [32][33][34][35][36][37].…”

Section: Introductionmentioning

confidence: 99%

Effects of Oblique Incidence of SV Waves on Nonlinear Seismic Response of a Lined Arched Tunnel

Lyu

et al. 2020

Shock and Vibration

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The incident direction of earthquake motion is an important factor affecting the seismic response of underground structures. In this study, a three-dimensional (3D) oblique incidence method of SV waves is proposed and the effects of incident angles of SV waves on the seismic response of a lined arched tunnel are evaluated. Based on wave field decomposition principle and equivalent node force method and together with viscous-spring artificial boundary, the oblique incidence method of SV waves is implemented by transforming seismic wave field into the equivalent nodal forces acting on the artificial boundaries. By deriving the distance of the incident waves and the reflected wave on free surface to artificial boundaries, this method can comprehensively consider the phase difference of the seismic wave propagation and the influence of the damping effect of the rock medium on the seismic wave propagation. The method is programed into a dynamic finite element program and its effectiveness is examined by a numerical example. Consequently, the oblique incidence method is applied to evaluate the seismic behaviors of the tunnel. The numerical results reveal that (1) the oblique incidence of the seismic wave results in a larger seismic response; (2) the response amplitudes of the stress and displacement increase with the increase of incident angles and reaching the maximum in the case of 30° incident angle; (3) the damage extent increases with an increase in the incident angles, and the oblique incidence of the seismic wave is believed to increase the spatial difference of damage distribution.

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“…Several strong earthquake events, such as the 1999 Chi-Chi Earthquake [1], the 1999 Turkey Koceali Earthquake [2], the 2004 Mid-Niigata Prefecture Earthquake [3,4], and the 2008 Wenchuan Earthquake [5][6][7], demonstrated that those tunnels may suffer different levels of seismic damage, ranging from lightly cracking to severely collapse. Therefore, the seismic stability of the tunnels in seismically active areas becomes an important engineering problem and arouses much attention [8].…”

Section: Introductionmentioning

confidence: 99%

Nonlinear Seismic Response of a Hydraulic Tunnel Considering Fluid-Solid Coupling

Lyu

et al. 2018

Mathematical Problems in Engineering

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The seismic response of hydraulic tunnels is a complex nonlinear process. What makes the case even more interesting is that the large amount of water in hydraulic tunnels which is likely to induce considerable hydrodynamic pressure acted on tunnel structures during earthquakes. In this work, a full three-dimensional (3D) dynamic finite element model is adopted to conduct a comprehensive assessment of the seismic behaviors of a hydraulic tunnel system. In this analysis, the plastic-damage model is employed to reflect the nonlinear mechanical behaviors of the concrete lining, and a fluid-solid coupling method based on an explicit weighted residual approach is proposed to consider the effects of the hydrodynamic pressures on the seismic response of the hydraulic tunnel. The numerical results indicate that the hydrodynamic pressure contributes to a greater seismic response of the tunnel structure. When the hydrodynamic pressure is considered, the magnitudes of the maximum principal stresses are likely to increase by 50% and the displacement amplitudes are approximately 2 cm more than that of without hydrodynamic pressure. The hydrodynamic pressure exacerbates the damage degree of the tunnel structure, and the waist suffers the most severe damage.

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Impact of incident angles of P waves on the dynamic responses of long lined tunnels

Cited by 83 publications

References 32 publications

Nonlinear Dynamic Response of a CC-RCC Combined Dam Structure under Oblique Incidence of Near-Fault Ground Motions

Nonlinear Dynamic Response of a CC-RCC Combined Dam Structure under Oblique Incidence of Near-Fault Ground Motions

Effects of Oblique Incidence of SV Waves on Nonlinear Seismic Response of a Lined Arched Tunnel

Nonlinear Seismic Response of a Hydraulic Tunnel Considering Fluid-Solid Coupling

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