A hybrid exploration approach for the prediction of geological changes ahead of mechanized tunnel excavation

Riedel, Christopher; Mahmoudi, Elham; Trapp, Maximilian; Lamert, Andre; Hölter, Raoul; Zhao, Chenyang; Musayev, Khayal; Baitsch, Matthias; König, Markus; Hackl, Klaus; Nestorović, Tamara; Friederich, Wolfgang

doi:10.1016/j.jappgeo.2022.104684

Cited by 5 publications

(1 citation statement)

References 24 publications

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“…A variety of factors influence tunnel deformation, such as the properties of rock masses, initial stresses, tunnel cross sections, tunnel support, and construction steps [6][7][8]. In view of the complexity of geology and the selection and application of tunnel construction methods, tunnel deformation cannot easily be estimated in terms of its magnitude and distribution [9]. It would be very helpful for the construction configuration and design to be able to estimate the pre-deformation behavior ahead of the excavation face.…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis of the Crown Displacements Caused by Tunnel Excavation with Rock Bolts

et al. 2022

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The complex geological structure of Taiwan often makes it difficult to control the deformation behavior of tunnel excavations. To simplify analyses, most traditional empirical formulations and modern numerical analyses do not consider the existence of rock bolts. For this reason, this study aimed to investigate the vertical displacements caused in tunnel crowns under various geological conditions using a three-dimensional finite element analysis with tunnels of different cross sections as an example. The analysis was performed using two rock material models: the Mohr–Coulomb and Hoek–Brown models. The results indicated that there was an insignificant difference between the two models in terms of the magnitudes of displacement and the distribution profiles obtained. When a tunnel was being excavated, the weaker the site was geologically and the larger the cross section, the larger the vertical crown displacement. In addition, the presence of rock bolts had a significant influence on the displacement in areas where the geology was weak and the cross section was large. The numerical analysis results of the Mohr–Coulomb and Hoek–Brown models were compared with the values calculated using the formulas suggested by Unlu and Gercek. At the excavation face, the displacement ratio derived from the prediction formula of Unlu and Gercek was smaller than the numerical analysis result, and the difference between the two became larger when the rock mass quality was worse.

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Section: Introductionmentioning

confidence: 99%

Numerical Analysis of the Crown Displacements Caused by Tunnel Excavation with Rock Bolts

et al. 2022

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Advance Reconnaissance and Optimal Monitoring

Mahmoudi

Düllmann

Heußner

et al. 2023

Interaction Modeling in Mechanized Tunneling

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Effective exploration techniques during mechanized tunneling are of high importance in order to prevent severe surface settlements as well as a damage of the tunnel boring machine, which in turn would lead to additional costs and a standstill in the construction process. A seismic methodology called full waveform inversion can bring a considerable improvement compared to state-of-the-art seismic methods in terms of precision. Another method of exploration during mechanized tunneling is to continuously monitor subsurface behavior and then use this data to identify disturbances through pattern recognition and machine learning techniques. Various probabilistic methods for conducting system identification and proposing an appropriate monitoring plan are developed in this regard. Furthermore, ground conditions can be determined by studying boring machine data collected during the excavation. The active and passive obtained data during performance of a shield driven machine were used to estimate soil parameters. The monitoring campaign can be extended to include above-ground structural surveillance as well as terrestrial and satellite data to track displacements of existing infrastructure caused by tunneling. The available radar data for the Wehrhahn-line project are displayed and were utilized to precisely monitor the process of anticipated uplift by injections and any subsequent ground building settlements.

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Comparison of Various Methodologies to Detect Anomalies in a Time Series Data Taken from a Tunnelling Project

Joshi,

Mahmoudi

2023

Lecture Notes in Civil Engineering

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A hybrid exploration approach for the prediction of geological changes ahead of mechanized tunnel excavation

Cited by 5 publications

References 24 publications

Numerical Analysis of the Crown Displacements Caused by Tunnel Excavation with Rock Bolts

Numerical Analysis of the Crown Displacements Caused by Tunnel Excavation with Rock Bolts

Advance Reconnaissance and Optimal Monitoring

Comparison of Various Methodologies to Detect Anomalies in a Time Series Data Taken from a Tunnelling Project

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