3D liquefaction assessment of soils surrounding circular tunnels

Unutmaz, Berna

doi:10.1016/j.tust.2013.09.006

Cited by 38 publications

(10 citation statements)

References 9 publications

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“…Liu and Song [7] and Azadi and Hosseini [8] studied the seismic behavior of shallow tunnels subjected to horizontal and vertical shaking in the liquefiable sands in order to assess the distortions occurring in the tunnel lining and its uplift due to excess pore pressure generation. Unutmaz [9] investigated the liquefaction possibilities of soil surrounding the tunnels using 3D finite element modeling (FEM) and studied the acceleration variations and the power spectra developed under the seismic vibrations for various tunnel embedment depths. Lanzano and Bilotta et al [10] studied the behavior of circular tunnels, both using a centrifuge and analytical modeling in order to determine the hoop forces and the distortions produced in the tunnel lining and concluded that both techniques produce results in good agreement.…”

Section: Of 22mentioning

confidence: 99%

“…The damping coefficients are calculated individually for each of the soil layers incorporated into the constitutive model definition. The tunnel lining and inner supporting structure are modeled using linear elastic plate elements as used by many other researchers in the past [8,9,16,17]. The Elastic modulus is taken as 37 MPa while the unit weight of concrete and the Poisson's ratio are taken as 25 kN/m 3 and 0.2, respectively.…”

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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Section: Of 22mentioning

confidence: 99%

Section: Constitutive Model and Boundary Conditionsmentioning

confidence: 99%

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

et al. 2020

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“…where V is P-or S-wave velocity, K is the effective elastic parameter, andρis the density of the medium, relates velocity, density, and the elastic parameters. K is a function of Lamé's constants, λ and μ, which are related to how a material responds to normal and shearing stresses [37]. The effective elastic parameter for the P-wave velocity is:…”

Section: Surface Waves (P-waves and S-waves)mentioning

confidence: 99%

Application of Tunnel Seismic Image Approach to the Advanced Geological Prediction for Tunnel

Guo

Luo

2014

JMM

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With the large-scale construction and rapid development of underground engineering, a large number of underground engineering construction, such as tunnel and subway emerged. The geological structure of the tunnel is complex and the roc is fragmented. Tunnel seismic image is a new geophysical technique. This method has advantages such as high resolution, high reliability and obvious image characteristics. Therefore, to insure the safety of the construction and to eliminate geological disasters, the advanced prediction technology of seismic image in tunnel detection is applied. In the paper, the seismic image was used to detect the Huangzhuang tunnel geological condition. The reflected waves, the refraction wave and the surface waves can reflect the same geological conditions, and the result is in accordance with the drilling. Tunnel seismic image can effectively and safely guide the excavation of the tunnel section working surface in combination with reconstructed images and excavation technology.

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“…One of most important geotechnical considerations for many engineering structures, such as anchors and pipeline, is the potential sand deposits' instability due to the development of high excess pore pressure caused by seismic loading (Chou et al 2001). During the recent earthquakes such as 1995 Kobe, Japan earthquake, the 1999 Chi-Chi, Taiwan earthquake, the 1999 Kocaeli and Duzce, Turkey earthquakes, some underground structures experienced some damage were also of concern (Hashash et al 2001;Wang et al 2001;Rezaei et al 2015;Tavakoli & Kutanaei 2015;Sarokolayi et al 2015;Unutmaz 2014). During an earthquake, soil particles are subjected to alternating cycles of shear stress of randomly varying *Corresponding author.…”

Section: Introductionmentioning

confidence: 99%

Control-volume-based finite element modelling of liquefaction around a pipeline

Sarokolayi¹,

Kutanaei

Golafshani

et al. 2015

Geomatics, Natural Hazards and Risk

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Pipelines are generally used to transmit energy sources from production sources to target places. Buried pipelines in saturated deposits during seismic loading could damage from resulting liquefaction due to accumulative excess pore-water pressure generation. In this paper, the evaluation of liquefaction potential in the vicinity of an offshore buried pipeline is studied using the control-volume-based finite element method. The objective of the present work is to study the effect of different governing parameters such as the specific weight of pipeline, Poisson's ratio, permeability of the soil, deformation module, pipeline diameter and pipeline burial depth on the soil liquefaction around a marine pipeline. The results of analysis indicated that with the increase of deformation module, Poisson's ratio and permeability of the soil coefficient, the liquefaction potential reduces. The liquefaction potential around the gas pipeline is much more than oil pipeline.

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3D liquefaction assessment of soils surrounding circular tunnels

Cited by 38 publications

References 9 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

Application of Tunnel Seismic Image Approach to the Advanced Geological Prediction for Tunnel

Control-volume-based finite element modelling of liquefaction around a pipeline

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