Effect of underground tunnel on the ground surface acceleration

Baziar, Mohammad Hassan; Moghadam, Masoud Rabeti; Kim, Dong-Soo; Choo, Yun Wook

doi:10.1016/j.tust.2014.07.004

Cited by 78 publications

(26 citation statements)

References 15 publications

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“…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. Apart from this, the response of underground tunnels subjected to seismic ground shaking have been studied experimentally (Chian and Madabhushi [18], Graziani and Boldini [19], Chian and Madabhushi [20], Abuhajar and Naggar et al [21]), analytically (Power et al [1], Chian and Tokimatsu [22], Bobet and Fernandez et al [23]) and numerically (Chou and Yang et al [24], Amorosi and Boldini [25], Baziar and Moghadam et al [26], Huo and Bobet et al [27], Nguyen and Lee et al [28]). However, all literature considers the conventional circular, rectangular or horseshoe shapes.…”

Section: Of 22mentioning

confidence: 99%

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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Section: Of 22mentioning

confidence: 99%

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

et al. 2020

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“…e rapid growth of population in big cities has led to the urban ground traffic more and more crowded [1][2][3]. Hence, different kinds of underground structures and spaces such as metro tunnels, metro stations, utility tunnels, underground shelters, and underpasses may appear in any large city.…”

Section: Introductionmentioning

confidence: 99%

Radial Joints Behavior of a Precast Asymmetric Underpass Induced by Long-Term Loads of Ground Vehicles

Jin

Liang

et al. 2020

Shock and Vibration

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With the rapid development of the urbanization, many underpasses are designed and constructed in big cities to alleviate the huge traffic pressure. The construction method has been changed from traditional on-site concrete pouring technology to prefabricated assembly technology. However, this change will inevitably bring out some new problems to be studied such as the behaviour of the radial joints. In this study, the numerical simulation model of Moziqiao precast and assemble underpass with large asymmetric cross section was constructed by using the ABAQUS software to study the transient response of the underpass induced by ground surface dynamic load. Based on the similarity theory a 1/10 scaled model test was carried out to study the long-term radial joint behaviour of the underpass considering the prestress loss during the 2000 000 loading cycles. The results transient dynamic response from computed and tested was compared in terms of acceleration. The comparison showed that the transient response accelerations have good consistency. The results of the physical model test were analysed in terms of joint opening, closure, and slipping. The accumulative joint opening was closely correlated to the prestress level, and the joint opening at different prestress levels increased with the loss of the prestress. The joints closure decreased with the increase of the previous accumulative color value. The joint slipping mainly attributed to the slipping of the top segment. Both the opening and slipping of the joints at RJ 1 were larger than that of RJ3 due to the wider span of RJ1, which reflected an asymmetric effect. This study revealed the long-term accumulative behaviour of the radial joints, which convinced us that the long-term accumulative deformation of the joints should be taken into consideration during the design stage for similar projects.

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“…Considering the importance of the subject, many researchers have conducted experimental and numerical studies on different aspects of seismic behavior of underground structures. Several numerical studies have been carried out by many researchers, such as Hashash et al, [2]; Huo et al, [3]; Anastasopoulos et al, [4,5]; Amorosi and Boldini, [6]; Kontoe et al, [7,8]; Baziar et al, [9]; Bilotta et al, [10]; to study the behavior of underground structures under dynamic loading. Also, a number of experimental studies have been carried out in recent years.…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical study of the behavior of shallow rectangular tunnels

Hassanzadeh¹,

Hajialilue-Bonab²

2018

J. vibroeng.

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The behavior of an underground structure under dynamic loading is affected by many factors such as shape, depth and stiffness of the structure as well as the frequency content of the input motion. Scarcity of experimental/field investigations precludes proper understanding of these parameters' effects on the seismic behavior of aforementioned structures. In this study, the effects of input motion along with structural stiffness properties on seismic behavior of rectangular tunnels are investigated. Three reduced-scale 1 g shaking table models were constructed in 1/48 scale. Tests were carried out in the shaking table facility at the University of Tabriz on model tunnels of the rectangular section of the shallow Tabriz subway tunnel, using input motions of different amplitudes and frequencies. In addition, a numerical study was done using the coupled scaled boundary finite element-finite element (SBFE-FE) method. A good agreement between the numerical model and the results of the experimental test was achieved. Using the shaking table test, the accelerations and bending moments of the tunnel lining were measured. The results show that tunnel lining stiffness affects the acceleration response of the ground. A parametric study by the numerical approach was presented and effects of the variation of elastic modulus and mass density of the soil were evaluated.

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Effect of underground tunnel on the ground surface acceleration

Cited by 78 publications

References 15 publications

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

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

Radial Joints Behavior of a Precast Asymmetric Underpass Induced by Long-Term Loads of Ground Vehicles

Experimental and numerical study of the behavior of shallow rectangular tunnels

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