A Study on the Dynamic Behavior of a Vertical Tunnel Shaft Embedded in Liquefiable Ground during Earthquakes

Kwon, Sun Yong; Yoo, Mintaek

doi:10.3390/app11041560

Cited by 4 publications

(2 citation statements)

References 23 publications

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“…The Fast Lagrangian Analysis of Continua (FLAC) 2D, two-dimensional continuum explicit finite element analysis code developed by Itasca consulting group Inc., was used. This software has been widely used for geotechnical analysis application in the fields of civil mining engineering [56][57][58].…”

Section: Analysis Methods and Input Datamentioning

confidence: 99%

Design Study of Steel Fibre Reinforced Concrete Shaft Lining for Swelling Ground in Toronto, Canada

Kim

Lee

2021

Applied Sciences

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Reinforced concrete (RC) is a widely used construction material around the world. RC has many advantages in terms of structural stability. However, the reinforcement of RC requires extensive labour costs. Steel fibre reinforced concrete (SFRC) has been widely studied to replace steel bars in concrete structures over the decades. However, most underground structures, such as tunnel lining, are usually designed using conventional RC for long-term stability due to unexpected geotechnical characteristics, such as directional and depth-dependent varied lateral pressure, earthquakes, groundwater, and time-dependent swelling behaviour. In this paper, an alternative design of shaft structure using SFRC, based on the original RC designed data in the Toronto region, was studied to evaluate the feasibility of SFRC replacing conventional RC. A key geological feature of the site is that the bedrock is comprised of Georgian Bay shale, which exhibits long-term time-dependent deformation (TDD). The capacities of RC and SFRC for the shaft lining were calculated based on the Canadian concrete design codes CSA A23.3 and RILEM TC 162-TDF, to assess the benefit of adding steel fibre, and several analytical solutions were used to calculate the applied load on the lining. A specialised TDD constitutive model in Fast Lagrangian Analysis of Continua (FLAC) 2D was developed to estimate whether the optimum installation time of the shaft lining, based on the geological reports, is appropriate under swelling behaviour, and evaluate the resultant long-term stability. The calculated hoop thrust and bending moment for several loading cases were within the capacity of the SFRC shaft lining. The numerical analysis demonstrated that the proposed lining installation time could be reduced, despite consideration of the long-term TDD behaviour.

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Section: Analysis Methods and Input Datamentioning

confidence: 99%

Design Study of Steel Fibre Reinforced Concrete Shaft Lining for Swelling Ground in Toronto, Canada

Kim

Lee

2021

Applied Sciences

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“…They presented the seismic risk level according to the soft ground depth and the return period of input seismic waves through earthquake risk assessment. Kwon and Yoo [21] conducted seismic analysis of the vertical shaft of the tunnel facility installed in the liquefiable ground through threedimensional (3D) finite-difference analysis. They presented the seismic risk level based on the length of the vertical shaft (tunnel depth), the thickness of the soft ground, and the return period of the input earthquake.…”

Section: Introductionmentioning

confidence: 99%

Evaluating Earthquake Stability of Solar Module Soundproofing Structure by 3D Numerical Analysis

Kwon,

Kim,

Yoo

2023

Buildings

Self Cite

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In this study, dynamic numerical analysis was conducted on the existing sound barrier wall structure and the recently developed double-sided solar-module-integrated sound barrier wall structure using the finite-difference method for numerical modeling. A seismic safety evaluation was performed based on a series of numerical analysis results. Both structures were modeled using a 3D modeling technique with FLAC 3D to account for differences in lateral stiffness. For seismic considerations, the Pohang seismic wave was selected to represent short-period earthquakes in line with Korea’s seismic characteristics. Additionally, the Hachinohe seismic wave was chosen to simulate long-period earthquakes and consider the effects of the seismic period. To calculate the input seismic waves based on the ground response, a site response analysis was conducted for a site designated for demonstrating a double-sided solar module-integrated sound barrier wall structure in Korea. The analysis reveals that the existing structure maintains overall structural integrity and ensures the safety of solar modules even in an earthquake with a return period of 2400 years. However, for a solar module-integrated sound barrier wall structure, stresses exceeding the compressive strength of the solar module occur in earthquakes with a return period exceeding 1000 years, necessitating additional design and reinforcement for preparation.

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Numerical Analysis Method for Liquefaction-induced Damage Evaluation to Railway Structure

Kwon

Yoo

2022

KSCE J Civ Eng

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A Study on the Dynamic Behavior of a Vertical Tunnel Shaft Embedded in Liquefiable Ground during Earthquakes

Cited by 4 publications

References 23 publications

Design Study of Steel Fibre Reinforced Concrete Shaft Lining for Swelling Ground in Toronto, Canada

Design Study of Steel Fibre Reinforced Concrete Shaft Lining for Swelling Ground in Toronto, Canada

Evaluating Earthquake Stability of Solar Module Soundproofing Structure by 3D Numerical Analysis

Numerical Analysis Method for Liquefaction-induced Damage Evaluation to Railway Structure

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