Ground Collapse in EPB shield TBM site: A case study of railway tunnels in the deltaic region near Nak-Dong River in Korea

Seol, Hoonil; Won, Dongju; Jang, Jae‐Won; Kim, Kwang Yeom; Yun, Tae Sup

doi:10.1016/j.tust.2021.104274

Cited by 14 publications

(2 citation statements)

References 21 publications

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“…Tunnels are constructed under complex and varying engineering geological conditions, where collapses, caving, and spalling occur frequently (Feng et al 2022;Chen et al, 2022;Wu et al 2020a, b;Seol et al 2021). Accurately revealing the deformation characteristics of tunnels is the basis for evaluating their safety.…”

Section: S D Strain Mean Vector V Ementioning

confidence: 99%

Crack propagation characteristics during progressive failure of circular tunnels and the early warning thereof based on multi-sensor data fusion

Zhang

Chao

Liu

et al. 2022

Geomech. Geophys. Geo-energ. Geo-resour.

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increases in AE entropy and covariance of the strain field. The monitoring data of each physical field provide early warning asynchronously: the early-warning time of AE entropy is the earliest while that of the AE quiet period is the latest. Membership functions are constructed taking early-warning results of monitoring data in various physical cases as bodies of evidence, and their critical values are determined using normal distribution. Multi-sensor data are fused using the Dempster-Shafer (D-S) evidence theory to realize time-varying prediction and provision of early warning with graded probabilities for tunnel failure based on collaborative multi-sensor data fusion. Article Highlights• The development of cracks and their initiation mechanisms of the tunnel model are explored. • The monitoring data of each physical field provide early warning of tunnel asynchronously. • Multi-sensor data are fused to realize time-varying prediction and warning with graded probabilities of tunnel failure. Keywords Tunnel • Crack propagation • Acoustic emission • Failure warning • Multi-sensor data fusion List of symbols Ω Covariance matrix S dTotal number of strain components Abstract Biaxial compression tests were conducted on circular tunnels that constructed in sandstone to reveal the evolution of macro-cracks, the strain field, and acoustic emission (AE) parameters during deformation of tunnels. An early-warning method for tunnel failure based on multi-sensor data fusion was studied. The results indicate that tensile cracks first initiate at the arch haunch of the tunnel; then shear cracks occur on both sides of the opening, forming two asymmetric V-shaped grooves; finally, tensileshear cracks on both sides of the tunnel propagate to the vault, triggering brittle failure of the tunnel. The strain concentration zones appear earlier than cracks in the tunnel, and the location and range of strain concentration zones cover the crack-propagation paths. Before the failure of tunnels, a series of precursor events occur, including an AE quiet period, a significant, rapid drop in the AE-based b value, and abrupt

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Section: S D Strain Mean Vector V Ementioning

confidence: 99%

Crack propagation characteristics during progressive failure of circular tunnels and the early warning thereof based on multi-sensor data fusion

Zhang

Chao

Liu

et al. 2022

Geomech. Geophys. Geo-energ. Geo-resour.

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“…However, shield tunnelling inevitably disturbs the surrounding rocks, leading to stress redistribution within the soil [1] and inducing surface settlement [2,3]. The excessive surface settlement can damage adjacent buildings and infrastructure [4,5], jeopardizing the safety of pedestrians, vehicles, and roads [6]. This in turn can lead to work stoppages and result in additional costs [7].…”

Section: Introductionmentioning

confidence: 99%

Analysis of Surface Settlement Induced by Shield Tunnelling: Grey Relational Analysis and Numerical Simulation Study on Critical Construction Parameters

Luo,

Wang,

Wang

et al. 2023

Sustainability

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Excessive surface settlement poses significant challenges to shield tunnelling construction, resulting in damage to adjacent buildings, infrastructure, and underground pipelines. This study focused on investigating the surface settlement induced by shield tunnelling during the construction of Qingdao Metro Line 6 between Haigang Road Station and Chaoyang Road Station. Firstly, the settlement data from the left line of the shield tunnel were evaluated by grey relational analysis. The relational coefficients were calculated to assess the correlation degrees of each influential parameter. Subsequently, the four critical influential parameters with the highest relational degrees were chosen to investigate their effects on surface settlement through numerical simulations under different scenarios. The results show that the four parameters with the highest relational degrees were thrust, grouting pressure, earth pressure, and strata elastic modulus. It should be noted that the strata elastic modulus significantly affects surface settlement, while the grouting pressure influences the settlement trough width in weak strata. Moreover, improper thrust magnitude can lead to an increase in surface settlement. Based on these findings, recommendations are proposed for the right-line tunnel construction and practical countermeasures for surface settlement during shield tunnelling construction are provided.

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Effect of Artificial Ground Freezing on Deep Excavation for Shield Tunnel Restoration: Field Application and Numerical Simulation

Park,

Son,

Park

et al. 2024

Lecture Notes in Civil Engineering

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Ground Collapse in EPB shield TBM site: A case study of railway tunnels in the deltaic region near Nak-Dong River in Korea

Cited by 14 publications

References 21 publications

Crack propagation characteristics during progressive failure of circular tunnels and the early warning thereof based on multi-sensor data fusion

Crack propagation characteristics during progressive failure of circular tunnels and the early warning thereof based on multi-sensor data fusion

Analysis of Surface Settlement Induced by Shield Tunnelling: Grey Relational Analysis and Numerical Simulation Study on Critical Construction Parameters

Effect of Artificial Ground Freezing on Deep Excavation for Shield Tunnel Restoration: Field Application and Numerical Simulation

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