Numerical Modeling of Ground Movement due to Twin Tunnel Structure of Esfahan Subway, Iran

Moosavi, Ehsan; Shirinabadi, Reza; Rahimi, Esmaeil; Gholinejad, Mehran

doi:10.1134/s1062739117042655

Cited by 10 publications

(4 citation statements)

References 14 publications

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“…erefore, currently we mainly rely on monitoring to identify the structure states to ensure the safety of underground construction [44][45][46]. However, numerical simulations perform well in regularity analysis [47][48][49][50][51][52][53][54][55]. In this case, the surface settlement curves obtained by simulation are consistent with the practical trend, although its values are quite different from the real situation.…”

Section: Distribution Of Surface Settlementmentioning

confidence: 93%

Tunnelling‐Induced Settlement and Treatment Techniques for a Loess Metro in Xi’an

Lai

et al. 2020

Advances in Civil Engineering

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Techniques including pre-grouting, long pipe roof, and parameter optimization were employed to ensure the safety of loess metro tunnelling under an existing glass building. Their effects were proved through monitoring the settlement of building and surface during tunnelling. Besides, division of settlement monitoring according to processes, a new method, was conducted to control settlement in time. The highest surface settlement after construction was 16 mm only, meeting the requirement. The result indicates that it is practicable to control the tunnelling settlement strictly in extremely difficult geological areas. The settlement regularities were also studied through numerical simulation; their deformation is larger compared with in situ results while their change trends coincide during most processes. Soil excavations cause settlement primarily, accounting for more than 60%. It is suggested that dual slurry pre-grouting and process-based measurement should be employed before each excavation in water-rich loess areas.

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Section: Distribution Of Surface Settlementmentioning

confidence: 93%

Tunnelling‐Induced Settlement and Treatment Techniques for a Loess Metro in Xi’an

Lai

et al. 2020

Advances in Civil Engineering

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“…et al, 2020;Lv et al, 2020;Li et al, 2021), especially at the junction of a variable section. In order to reduce the impact on ground traffic, the undercutting method is usually used in the construction of an urban Metro with dense buildings (Bobet, 2001;Khademian et al, 2017;Cao et al, 2018;Moosavi et al, 2018;Li et al, 2019;Wang et al, 2021b). The cross passage near the Metro station is used as the connection part between the shaft and the main tunnel, and this transfer section between the shaft and the main tunnel is the key section of Metro station construction.…”

Section: Introductionmentioning

confidence: 99%

Construction Method Optimization for Transfer Section Between Cross Passage and Main Tunnel of Metro Station

et al. 2022

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The transfer section between the cross passage and the main tunnel is the part that needs to be paid attention to during the underground excavation construction of the subway. Due to complex stress, the collapse of the horsehead gate and excessive surface settlement often occur. In order to determine the construction scheme of the transfer section between the cross passage and the main tunnel of Guanshui Road Station of Metro Line two in Guiyang, China, the numerical simulation method was used to analyze the “double-holes interval pillar method,” “sector expansion method,” and “gate climbing method,”, respectively. The mechanical response of the surrounding rock and supporting structure under each method was compared. The comparisons showed that the surface settlement, the displacement of the cave, and the plastic zone caused by the double-holes interval pillar method were the smallest, and the method can reduce the construction risk, shorten the construction period, and reduce the project cost. Therefore, it was recommended to use the double-holes interval pillar method to construct the transfer section. The comparison between the measured data and the numerical simulation results of the double-holes interval pillar method showed that the numerical simulation results were smaller than the measured data at each point, and the surface settlement and horizontal displacement in the tunnel both met the safety control standard.

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“…The most destructive tunneling impact on the environment is the ground settlement which creates serious problems for the existing buildings and structures along the tunnel alignment (Moosavi et al 2018). Surface settlement during tunnel excavation has been specially considered due to potential danger to the adjacent structures, infrastructures, establishments, etc.…”

Section: Introductionmentioning

confidence: 99%

Three-Dimensional Probabilistic Analysis of the Surface Settlement Based on Spatial Variability of Soil Properties: Case Study Zarbalizadeh NATM Tunnel

et al. 2022

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Designing and the construction of a tunnel in urban areas has their own specific considerations. Usually, excessive settlement caused by tunneling during construction damages the adjacent infrastructures and utilities, especially if the tunnel is excavated by the new Austrian tunneling method (NATM). Thus, it's important to make accurate predictions and effective control on tunneling-induced settlement. In this study, the soil's Young's modulus was modeled using a three-dimensional random field and coupled with a finite difference method (FDM) analysis to reveal the influence of scale of fluctuation (SOF) on the maximum surface settlement (Smax). To generate the field of soil's Young's modulus, the Fourier series method is employed and sensitivity studies are further performed via Monte-Carlo simulations (MCS). The results demonstrate both the mean value of Smax and its coefficient of variation (COV) increase from 28 mm to 31 mm and from 0.02 to 0.35 respectively, with an increasing horizontal SOF but they stabilize at higher values of SOF. Furthermore, the probability of failure increases as COV increases for each allowable limit greater than the verification FDM of Smax. It is observed that ignoring the spatial variability of soil's properties leads to an underestimate of the risk of excessive surface settlement.

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Numerical Modeling of Ground Movement due to Twin Tunnel Structure of Esfahan Subway, Iran

Cited by 10 publications

References 14 publications

Tunnelling‐Induced Settlement and Treatment Techniques for a Loess Metro in Xi’an

Tunnelling‐Induced Settlement and Treatment Techniques for a Loess Metro in Xi’an

Construction Method Optimization for Transfer Section Between Cross Passage and Main Tunnel of Metro Station

Three-Dimensional Probabilistic Analysis of the Surface Settlement Based on Spatial Variability of Soil Properties: Case Study Zarbalizadeh NATM Tunnel

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