Studying the effect of some parameters on the stability of shallow tunnels

Abdellah, Wael R.; Ali, Mohamed S.; Yang, Hyung-Sik

doi:10.1016/j.jsm.2018.02.001

Cited by 23 publications

(14 citation statements)

References 16 publications

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“…The magnitude of deformations around circular tunnels is very different, according to the applied tensile stress, materials properties (hard/soft rocks and soil), and the dimension of the tunnel. If the tunnel depths are limited to very shallow (<10-20 m), the deformation values calculated in the case studies vary from sub-millimeter depending on the scenarios [70][71][72]. However, the fractures in the weathering wall of the lava tubes and the relatively weak brittle strength of basaltic rocks, combined with anthropogenic or structural stresses certainly cause sufficiently high deformations, which can be detected by InSAR observations.…”

Section: Discussionmentioning

confidence: 93%

“…The cave shape of Figure 9c was extracted from the TLS of Gamnamdap cave, and it fits well to the known cave geometry in Jeju Island. Thus, the displacement induced by collapse will be dominated by the vertical way but mixed with the horizontal deformations which are applied symmetrically at the center of the approximated circular shape as shown in [70]. Therefore, H-migrations detected by PS InSAR mainly contained part of horizontal deformations directed toward the SAR sensor.…”

Section: Discussionmentioning

confidence: 99%

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The Survey of Lava Tube Distribution in Jeju Island by Multi-Source Data Fusion

Kim

Lin

2022

Remote Sensing

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Lava tubes, a major geomorphic element over volcanic terrain, have recently been highlighted as testbeds of the habitable environments and natural threats to unpredictable collapse. In our case study, we detected and monitored the risk of lava tube collapse on Jeju, an island off the Korean peninsula’s southern tip with more than 200 lava tubes, by conducting Interferometric Synthetic Aperture Radar (InSAR) time series analysis and a synthesized analysis of its outputs fused with spatial clues. We identified deformations up to 10 mm/year over InSAR Persistent Scatterers (PSs) obtained with Sentinel-1 time series processing in 3-year periods along with a specific geological unit. Using machine learning algorithms trained on time series deformations of samples along with clues from the spatial background, we classified candidates of potential lava tube networks primarily over coastal lava flows. What we detected in our analyses was validated via comparison with geophysical and ground surveys. Given that cavities in the lava tubes could pose serious risks, a detailed physical exploration and threat assessment of potential cave groups are required before the planned intensive construction of infrastructure on Jeju Island. We also recommend using the approach established in our study to detect undiscovered potential risks of collapse in the cavities, especially over lava tube networks, and to explore lava tubes on planetary surfaces using proposed terrestrial and planetary InSAR sensors.

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Section: Discussionmentioning

confidence: 93%

Section: Discussionmentioning

confidence: 99%

The Survey of Lava Tube Distribution in Jeju Island by Multi-Source Data Fusion

Kim

Lin

2022

Remote Sensing

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“…The application of stress concentration failure criterion has been addressed by different studies in numerical stability analysis of underground excavations (e.g. Kumar 2003;Zhang and Mitri 2008;Abdellah 2015;Shnorhokian et al, 2018;Abdellah et al, 2018).…”

Section: Stress Concentration Factor (Induced Stress Level Criterion)mentioning

confidence: 99%

The damage-failure criteria for numerical stability analysis of underground excavations: A review

Heidarzadeh

Saeidi

Rouleau

2021

Tunnelling and Underground Space Technology

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“…Various researchers have adopted convergence indices to judge the failure or ultimate/serviceability limit state of the excavation (e.g. Heidarzadeh et al, 2021;Zhang and Mitri, 2008;Abdellah et al, 2018). Convergence ratio i.e.…”

Section: Convergencementioning

confidence: 99%

Modelling of sensitivity of underground space stability to the in situ stress uncertainties: case study at the Bukov underground research facility phase II (Rozna mine, Czechia)

Gong¹

2021

Acta Geodynamica Et Geomaterialia

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Numerical modelling has been widely used in the underground excavation design, where the in situ stress state plays a crucial role in the stability analysis. However, determination of an exact stress state for a specific geological region remains uncertain due to the complicated tectonic nature and measurement limitations. The stability is thus better analysed by considering the in situ stress as a finite spectrum and pinpointing the possible worst-case scenario. The most probable scenarios of in situ stress states in the Rožná mine area were analysed based on the varying trends in principal stress ratio and mean stress values obtained from four different measurement/analysis campaigns. The influence of different in situ stress judgement on the deformation and failure characteristics of the Bukov Underground Research Facility (URF) (Phase II, Czech) were investigated by the finite volume program FLAC3D. Results show that the increased horizontal stress anisotropy and the mean stress level jointly increase the overall deformation and lower the URF stability. Such influences on the roadway horizontal convergence are more considerable than the vertical ones. A mathematical model considering mean stress and horizontal stress ratio was proposed to quantitatively describe the overall stability, especially useful for excavations possessing complicated configuration.

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Studying the effect of some parameters on the stability of shallow tunnels

Cited by 23 publications

References 16 publications

The Survey of Lava Tube Distribution in Jeju Island by Multi-Source Data Fusion

The Survey of Lava Tube Distribution in Jeju Island by Multi-Source Data Fusion

The damage-failure criteria for numerical stability analysis of underground excavations: A review

Modelling of sensitivity of underground space stability to the in situ stress uncertainties: case study at the Bukov underground research facility phase II (Rozna mine, Czechia)

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