Face stability analysis of shallow circular tunnels driven by a pressurized shield in purely cohesive soils under undrained conditions

Ding, Wenqi; Liu, Keqi; Shi, Peihe; Li, Mingjiang; Hou, Minglei

doi:10.1016/j.compgeo.2018.11.025

Cited by 45 publications

(5 citation statements)

References 23 publications

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“…During the construction of tunnel engineering, the excavation may weaken the tunnel face and cause face failure, especially for shallow tunnels (Yoo, 2002;Khezri et al, 2015;Patil et al, 2018;Ding et al, 2019). Tunnel excavation mainly refers to the closed-face case, like the open-face conventional tunneling or the shield tunneling (Pan et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

An upper-bound analytical model of blow-out for a shallow tunnel in sand considering the partial failure within the face

Chen

Wang

et al. 2019

Tunnelling and Underground Space Technology

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HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.

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Section: Introductionmentioning

confidence: 99%

An upper-bound analytical model of blow-out for a shallow tunnel in sand considering the partial failure within the face

Chen

Wang

et al. 2019

Tunnelling and Underground Space Technology

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“…The cause of these problems was the failure of tunnel face stability. One of the most important factors affecting tunnel stability is tunnel face stability [40][41][42][43][44][45][46]. In addition, planning a TBM drive in squeezing ground is a complex problem for tunnel engineering [47].…”

Section: Investigation Of the Collapsed Zone And Squeezing Mechanismmentioning

confidence: 99%

A Geotechnical Perspective on a Complex Geological Environment in a High-Speed Railway Tunnel Excavation (A Case Study from Türkiye)

et al. 2022

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The T26 tunnel was designed within the scope of the Ankara-Istanbul high-speed railway in accordance with the speed of 250 km/h. Some serious problems and excessive deformations were encountered during the excavation works. The deformations in the tunnel caused subsidence on the surface and the Tunnel Boring Machine (TBM) became stuck; therefore, tunnel excavation works were suspended. Design works for re-excavation in the T26 tunnel and extracting of the TBM were carried out and the tunnel was re-designed by the New Austrian Tunneling Method (NATM) system. The main purposes of the present study are to describe the problems encountered during the T26 tunnel and to discuss the sources of the problems. The advantages and disadvantages of TBM and NATM methods for the tunnel having difficult ground conditions were discussed. Critical points needing to be considered for the tunnels excavated with TBM through weak ground conditions and the effect of the TBM selection process were discussed. Considering the complex geological and geotechnical structure of the tunnel route, it is possible to say that the T26 case is an interesting case for tunnel engineering. Along the tunnel route, landslides, high seismic activity, groundwater conditions, and extremely weak rock mass features coexist. Therefore, the tunnel route is a very complex environment. However, due to the geometric limitations of the high-speed railways, relocation of the route is not possible. The experiences gained from tunnel excavations under difficult conditions are capable of bringing new horizons to future tunneling studies.

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“…The use of PPM as an auxiliary construction method has been widely accepted by the engineering community, and there are many successful examples in public works. However, there are few studies on shallow-buried rectangular excavations reinforced by a pipe roof [34,35]. The formations in the Taipei Basin are mostly composed of weak clay layers, which are highly sensitive, causing the formations to be easily disturbed and the undrained shear strength to be greatly reduced.…”

Section: Introductionmentioning

confidence: 99%

Numerical Model for Rectangular Pedestrian Underpass Excavations with Pipe-Roof Preconstruction Method: A Case Study

Chen

Chang

Qiu³

et al. 2023

Applied Sciences

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Under weak geological conditions, soil deformation and surface settlement are the key factors affecting the success of shallow-buried rectangular excavation. To investigate this issue, an underpass of Zhongxiao East Road in Taipei City was used as a case study. The surface settlement and lateral deformation of an underground diaphragm wall caused by the excavation of a rectangular pedestrian underpass using the pipe-roof preconstruction method (PPM) were investigated by 3D finite element analysis. The numerical analysis results showed that the constructed numerical analysis model had considerable accuracy. The use of PPM combined with a box culvert structure to form a pedestrian underpass could effectively control the surface displacement above the box culvert. Under the condition of the same sectional area, the smaller the width of the pipe-roof structure, the more the impact on the ground surface was reduced. The maximum positive bending moment and maximum negative bending moment on the pipe roof produced by excavation at each stage were roughly inversely related to the height per the width of the cross-section of the pipe diaphragm structure. The results showed that the pipe-roof structure was suitable for underground excavation with shallow-buried depth in the soft soil of the Taipei Basin. Moreover, the shallow-buried box culvert was more sensitive to the subsidence caused by construction than the deep-buried box culvert.

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Face stability analysis of shallow circular tunnels driven by a pressurized shield in purely cohesive soils under undrained conditions

Cited by 45 publications

References 23 publications

An upper-bound analytical model of blow-out for a shallow tunnel in sand considering the partial failure within the face

An upper-bound analytical model of blow-out for a shallow tunnel in sand considering the partial failure within the face

A Geotechnical Perspective on a Complex Geological Environment in a High-Speed Railway Tunnel Excavation (A Case Study from Türkiye)

Numerical Model for Rectangular Pedestrian Underpass Excavations with Pipe-Roof Preconstruction Method: A Case Study

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