Spatial Distribution Law of Vibration Acceleration of Ultra-small-spacing Tunnel under Train Moving Loads

Wang, Shuren; Shi, Kunpeng; Li, Zhenhua; Li, Zhichao; Wang, Yunfei

doi:10.25103/jestr.126.12

Cited by 3 publications

(1 citation statement)

References 9 publications

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“…4. In addition, Wang et al established the computational models to conduct the related analysis [34][35][36]. Zeng et al studied the attenuation law of the vibration acceleration in the foundation under high-speed train loading through the field tests [37].…”

Section: Verification Analysis By Numerical Simulationmentioning

confidence: 99%

Size Effect Analysis of Scale Test Model for High-speed Railway Foundation under Dynamic Loading Condition

Wang¹,

Kunpeng

Zou

et al. 2021

Teh. vjesn.

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To determine the energy attenuation and energy reflection coefficients in layered foundation is the key factor to reveal the dynamic response characteristics of the high-speed railway foundation. Based on the foundation test model under the dynamic loading of the high-speed railway, the energy attenuation and energy reflection coefficients were introduced and the attenuation formulas of the vibration acceleration in the layered foundation were deduced. Five scale models of 1:1, 1:2, 1:5, 1:10 and 1:20 are established respectively by using Abaqus technique. The energy attenuation mechanism and interfacial energy reflection characteristics in the layered foundation were analyzed. Results show that it is appropriate to use vibration acceleration to characterize the propagation rule of the energy attenuation in the layered foundation. The size effect equations of the energy attenuation and energy reflection coefficients in the layered foundation are deduced and the size effect of the energy attenuation is revealed. Based on the nonlinear relationships among the energy attenuation coefficient, the model scale, the loading amplitude and the vibration frequency, the energy attenuation equation of the scale test model is constructed. The reliability of the theoretical and simulation results is verified by the scale test model. The conclusions obtained in this study can provide a reference for a similar engineering practice.

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Section: Verification Analysis By Numerical Simulationmentioning

confidence: 99%

Size Effect Analysis of Scale Test Model for High-speed Railway Foundation under Dynamic Loading Condition

Wang¹,

Kunpeng

Zou

et al. 2021

Teh. vjesn.

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Impacts of train-induced dynamic loads on goaf foundation of Qinshui coalfield

Wang

Zhou²,

Cheng³

et al. 2023

Front. Earth Sci.

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For the high-speed railway built in the goaf sites, if the influence depth of the additional loads reaches the collapse fault zone of the goaf foundation, the overburden rock mass above the mined area will move again, causing the surface to deform again, which seriously threatens the construction, operation, and maintenance of the high-speed railway lines. Therefore, in order to improve the safety and stability of operation of high-speed railway in goaf sites, it is essential to determine the activation deformation of the goaf foundation. In this paper, based on the additional stress method, the newly added embankment materials are taken as uniformly distributed strip static loads, and the high-speed railway in operation is regarded as the fluctuation-concentrated dynamic loads. The 1/4 vehicle vibration model with two degrees of freedom is introduced, and the influence depth of the additional loads of the goaf foundation is calculated. The criterion of activation is proposed based on the relationship between the influence depth of additional loads and the height of the collapse zone and fault zone. Conclusions drawn are as follows: i) the activation judgment criterion for the goaf foundation under the influence of high-speed railway vibration loads is recommended; ii) case study shows that the rail surface vibration model applicable to quantify the influence depth of high-speed railway mentioned previously mined-out regions; iii) the influence of rail surface irregularity on influence depth cannot be ignored; iv) the research conclusion can provide reference for site selection of high-speed railway and embankment deformation analysis.

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Experimental study on dynamic interaction between ground fissure and diagonal three-section subway tunnels

Liu,

Ren,

Peng

et al. 2024

Front. Earth Sci.

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Ground fissures, as a typical geohazard, pose potential georisks to the construction and maintenance of urban transportation infrastructure. Under the influence of ground fissures, the segmented tunnel structure used in subway systems complicates the propagation of subway train vibrations. In this study, the soil acceleration, earth pressure and contact pressure of a three-section subway tunnel under dynamic loading of a subway train in a ground fissure environment were observed and analyzed by physical modeling tests, and the effects of the presence and activity of the ground fissure and tunnel segmentation were discussed. The results show that the vibration generated by the subway traveling will have different degrees of attenuation when propagating in all directions in the soil layer, and the ground fissure has a damping effect on the subway vibration. The attenuation and enhancement of acceleration by ground fissure is affected by the activity and propagation direction of ground fissure. The distribution of additional earth pressure is affected by the ground fissure, soil contact state, which is related to the ground fissure activity state. The ground fissure activity on the contact additional pressure mainly focuses on the bottom and top of the tunnel and there are differences in the location of the hanging wall and footwall. Three-section tunnels have a stronger vibration response and vibration attenuation than monolithic tunnels due to the influence of segmentation. Based on the consideration of the effects of ground fissure and tunnel segmentation, the tunnel design mainly takes into account the amount of ground fissure activity and determines the structural measures, the tunnel structure at the location of the ground fissure is strengthened, in addition to the vibration attenuation measures for the segmented tunnels when crossing the ground fissure. The discussion of mechanical response and design measures in this study helps to reduce the georisk of ground fissures on urban underground transportation infrastructure.

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Spatial Distribution Law of Vibration Acceleration of Ultra-small-spacing Tunnel under Train Moving Loads

Cited by 3 publications

References 9 publications

Size Effect Analysis of Scale Test Model for High-speed Railway Foundation under Dynamic Loading Condition

Size Effect Analysis of Scale Test Model for High-speed Railway Foundation under Dynamic Loading Condition

Impacts of train-induced dynamic loads on goaf foundation of Qinshui coalfield

Experimental study on dynamic interaction between ground fissure and diagonal three-section subway tunnels

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