Effect of Flexibility Ratio on Seismic Response of Cut‐and‐Cover Box Tunnel

Sadiq, Shamsher; Nguyen, Quang Van; Jung, Hyunwoo; Park, Duhee

doi:10.1155/2019/4905329

Cited by 13 publications

(15 citation statements)

References 51 publications

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“…The variables required to generate the nonlinear curves for each layer are the coefficient of lateral earth pressure (K 0 ), plasticity index (PI), number and frequency of cycles (N), loading frequency (f ), and over consolidation ratio (OCR). Because of the unavailability of site-specific index properties, PI for the sand and clay was assumed as 0% and 15% [20][21][22][23][24][25], respectively, whereas OCR was taken as 1. N and f were set to 10 and 1, respectively, as recommended by Darendeli [19], Ding et al [22], and Harmon et al [23].…”

Section: Site Response Analysis Methodologymentioning

confidence: 99%

A Site-Specific Response Analysis: A Case Study in Hanoi, Vietnam

et al. 2020

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A series of one-dimensional (1-D) site response analyses were performed using the nonlinear (NL) and equivalent linear (EQL) approaches to assess the applicability of the Vietnamese earthquake-resistance design code TCVN 9386: 2012. Six soil profiles were selected from three districts in Hanoi (Vietnam). A number of ground motions compatible with the rock design spectrum were used as input for carrying out analyses. The results highlight that the calculated response is higher than the design spectrum for site class C and lower for site class D. The normalized response spectra of the EQL approach results are higher than those of the NL approach. Moreover, the peak ground accelerations at the surface from EQL analyses are greater than those of the NL method because the latter generates a higher amount of nonlinearity. The results from the NL approach also illustrate that the deamplification phenomenon occurs in the soft soils of the Hanoi region (e.g., soil profile P3 and P5 of site class D). Additionally, the shear strains calculated from the NL method are closely matched with those from the EQL method, the difference between them increasing with a decrease in soil stiffness.

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Section: Site Response Analysis Methodologymentioning

confidence: 99%

A Site-Specific Response Analysis: A Case Study in Hanoi, Vietnam

et al. 2020

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“…IV. ONE-DIMENSIONAL ANALYSIS One-dimensional (1D) nonlinear analysis was performed using DEEPSOIL v7.0 [5][6][7][8][9]. The most widely used pressuredependent hyperbolic, the Modified Kodner-Zelasko (MKZ) model [10], implemented in DEEPSOIL, was used.…”

Section: Input Ground Motionsmentioning

confidence: 99%

One-dimensional Site Response Analysis and Liquefaction Evaluation of Can Tho City, Vietnam

Nguyen¹,

Nguyễn²

2022

Eng. Technol. Appl. Sci. Res.

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Can Tho is the biggest city in the Mekong River Delta, one of the five national central cities in Vietnam. However, it has not been studied regarding seismic hazard estimation. For this purpose, one-dimensional nonlinear site response analysis of this city was performed in this paper. The measured in-situ profiles and corresponding geotechnical site investigation and laboratory test data were utilized to develop the site model for site-specific ground response analysis. A suite of earthquake records compatible with the Vietnam rock design spectrum (TCVN 9386:2012) was used as input ground motions at the bedrock. The results show that Peak Ground Acceleration (PGA) increases from the bedrock to the surface. Maximum PGA is 0.083g for O Mon district (P1) and 0.073g for Cai Rang district (P2). The maximum shear strain is reported to be 0.35% for P1 and 0.45% for P2. The recommended amplification factors are 1.7 for P1 and 1.9 for P2. Even though Can Tho city is composed of soft layers, liquefaction is unlikely to occur.

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“…One-dimensional equivalent linear (EQL) and nonlinear (NL) response analysis is performed using DEEPSOIL v7.0 [22] in this study. is program has been widely used in previous studies [7,16,[23][24][25][26]. One-dimensional site response analysis is the process of propagating shear waves numerically from the reference rock through the overlying soil layers to the surface.…”

Section: One-dimensional Ground Response Analysismentioning

confidence: 99%

“…A recently developed Generalized Quadratic/Hyperbolic (GQ/H) constitutive model [27] implemented in DEEPSOIL v7.0 was used in this study. is is a widely used model in site response analysis [15,24,25,[28][29][30] and can capture an initial shear modulus at zero shear strain as well as a limiting shear strength at large shear strains. e pressure-dependent nonlinear dynamic curves proposed by Darendeli [31] [23], and Nguyen et al [7].…”

Section: One-dimensional Ground Response Analysismentioning

confidence: 99%

Evaluation of Seismic Site Amplification Using 1D Site Response Analyses at Ba Dinh Square Area, Vietnam

Tran

Aaqib

Nguyen

et al. 2021

Advances in Civil Engineering

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This study presents a case study on ground response analysis of one of the important cultural heritages in Hanoi, Vietnam. One-dimensional nonlinear and equivalent linear site response analyses which are commonly applied to solve the problem of seismic stress wave propagation are performed at the Ba Dinh square area. A measured in-situ shear wave velocity profile and corresponding geotechnical site investigation and laboratory test data are utilized to develop the site model for site-specific ground response analysis. A suite of earthquake records compatible with Vietnamese Design Code TCVN 9386: 2012 rock design spectrum is used as input ground motions at the bedrock. A few concerns associated with site-specific ground response evaluation are analyzed for both nonlinear and equivalent linear procedures, including shear strains, mobilized shear strength, and peak ground acceleration along with the depth. The results show that the mean maximum shear strains at any soil layer are less than 0.2% in the study area. A deamplification portion within the soil profile is observed at the layer interface with shear wave velocity reversal. The maximum peak ground acceleration (PGA) at the surface is about 0.2 g for equivalent linear analysis and 0.16 g for nonlinear analysis. The ground motions are amplified near the site natural period 0.72 s. The soil factors calculated in this study are 1.95 and 2.07 for nonlinear and equivalent linear analyses, respectively. These values are much different from the current value of 1.15 for site class C in TCVN 9386: 2012. A comparison of calculated response spectra and amplification factors with the local standard code of practice revealed significant discrepancies. It is demonstrated that the TCVN 9386: 2012 soil design spectrum is unable to capture the calculated site amplification in the study area.

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Effect of Flexibility Ratio on Seismic Response of Cut‐and‐Cover Box Tunnel

Cited by 13 publications

References 51 publications

A Site-Specific Response Analysis: A Case Study in Hanoi, Vietnam

A Site-Specific Response Analysis: A Case Study in Hanoi, Vietnam

One-dimensional Site Response Analysis and Liquefaction Evaluation of Can Tho City, Vietnam

Evaluation of Seismic Site Amplification Using 1D Site Response Analyses at Ba Dinh Square Area, Vietnam

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