Analysis of the settlement of an existing tunnel induced by shield tunneling underneath

Jin, Dalong; Yuan, Dajun; Li, Xinggao; Zheng, Haotian

doi:10.1016/j.tust.2018.06.035

Cited by 122 publications

(41 citation statements)

References 16 publications

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“…erefore, the theoretical prediction needs to be compared with other approaches to prove its applicability. Researchers have also studied the settlement through model tests [16,17] and field monitoring [18][19][20][21][22], which increases the experience in various regions and is of guiding importance when tunnelling in similar strata. Regarding the auxiliary measures to confine settlement induced by metro tunnelling, there are three main aspects: grouting [23][24][25][26][27][28], pipe roof [29][30][31][32][33][34][35], and optimizing support parameters [36][37][38][39][40].…”

Section: Introductionmentioning

confidence: 99%

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: Introductionmentioning

confidence: 99%

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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“…Ng et al [9] investigated the interaction between the breadth of an existing horseshoe tunnel and diameter of a new circular tunnel (B/D) at the time of vertical passing. As the computational results reveal, the maximum settlement of the existing tunnel's invert center was unaffected by the magnitude of the B/D ratio at different overburden depths.…”

Section: Introductionmentioning

confidence: 99%

Numerical Parametric Study of Countermeasures to Alleviate the Tunnel Excavation Effects on an Existing Tunnel in a Shallow-Buried Environment near a Slope

et al. 2020

Applied Sciences

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This paper studies the influence law of existing tunnels on the construction of intersecting new tunnels in a shallow slope burial context through 3D numerical analysis. The emphasis is on exploring the effect of new tunnels constructed in 54 conditions, including three ratios of overburden to tunnel height (C/H), three ratios of slope distance to tunnel span (D/W), two backfilling conditions of the existing tunnel (“hty” and “htn” conditions), and three magnitudes of surface loads (10 kPa, 20 kPa, and 30 kPa), on the deformation of lateral slopes and the overlying road. As the results show, the rigidly separated area between the existing and newly built tunnels in parallel to the excavation direction was precisely the sensitive area affected by the existing tunnel backfilling condition. The road settlement simulations perpendicular to the excavation direction revealed that various C/H and D/W ratio combinations controlled the shape and size differences of the settlement trough curve. This was because the C/H ratio primarily controlled the effective span and height transition of the newly built tunnel, whereas the D/W ratio mainly controlled the intersection position of the tunnels. Next, model A-A (“hty” condition) was identified as the only feasible construction model among all models in accordance with the engineering safety control criteria. Lastly, comparison of monitoring data with simulations found a slight difference in the distribution pattern between the two. Nevertheless, the final maximum settlement fully satisfied the construction control requirements overall. Aside from proving the correctness of simulation results, the present study also sets an excellent referential example for similar projects.

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“…e results show that due to oblique intersection, the transverse deformation and internal force of the existing tunnel show obvious asymmetric characteristics. Similarly, Jin et al [17] analysed the deformation of the existing tunnel and the additional stress caused by shield tunnelling underneath. An empirical formula for the settlement of existing tunnels caused by new shield tunnels was proposed.…”

Section: Introductionmentioning

confidence: 99%

Study on Construction Influence of Shield Tunnel of Urban Rail Transit on Large‐Section Mining Tunnel

Zhang

Yan

et al. 2020

Advances in Civil Engineering

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Due to the increasingly expanding of urban rail transit, shield tunnelling adjacent to existing tunnels has become more and more common in cities. Construction of new tunnels will pose great risks to the safety of existing tunnels. This paper focused on the influence of shield tunnelling on the large-section mining tunnel in the argillaceous siltstone stratum and proposed the influence zone based on the surface subsidence criterion. By carrying out numerical simulations and model test, the surface subsidence, the internal force of the mining tunnel, and the surrounding rock pressure were monitored and the accuracy of the influence zone was verified. The research shows that the shield machine tunnels forward from one time the excavation diameter before the monitoring section until the monitoring section completes the segment assembly. This process is the main stage that causes the increase in the corresponding surface settlement and the additional displacement of the existing mining tunnel. The excavating tunnel influences on the mining tunnel structure were mainly shown at the vertical additional deformation, which is manifested as the overall floating of the mining tunnel. The influence of internal force was performed as the asymmetric change of internal force of the mining tunnel. The mining tunnel is closer to the shield tunnel, showing more significant changes of the internal force of the structures. The structure near the shield tunnel is strengthened by pressure, and the structure far away from the shield tunnel is more prone to tensile failure.

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Analysis of the settlement of an existing tunnel induced by shield tunneling underneath

Cited by 122 publications

References 16 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

Numerical Parametric Study of Countermeasures to Alleviate the Tunnel Excavation Effects on an Existing Tunnel in a Shallow-Buried Environment near a Slope

Study on Construction Influence of Shield Tunnel of Urban Rail Transit on Large‐Section Mining Tunnel

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