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Keywords: excavation
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Proceedings Papers

Paper presented at the 15th ISRM Congress, October 9–14, 2023
Paper Number: ISRM-15CONGRESS-2023-294
... ABSTRACT: Significant changes in stress distribution are caused by the mining excavation process, which could lead to instabilities. The conventional approach involves the installation of rock bolts along with other support measures. Technological advancement enables upgrading these bolts...
Proceedings Papers

Paper presented at the 15th ISRM Congress, October 9–14, 2023
Paper Number: ISRM-15CONGRESS-2023-251
...-term deformations of the primary lining. The range of displacements highly depends on the applied excavation- and support concept (Radončić 2011), but typically reaches several tens of centimetres in weak ground conditions. The direct relation between rock pressure and deformation, represented...
Proceedings Papers

Paper presented at the 15th ISRM Congress, October 9–14, 2023
Paper Number: ISRM-15CONGRESS-2023-290
... an assessment approach based on numerical analyses. This study implements three-dimensional finite element analyses to evaluate and optimize the utilization of the umbrella arch method in the weak zones. Results show that the deformation of the excavation face at the vault can be reduced by approximately 40...
Proceedings Papers

Paper presented at the 15th ISRM Congress, October 9–14, 2023
Paper Number: ISRM-15CONGRESS-2023-296
... ABSTRACT: At the construction Lot SBT 3.1 of the Semmering Base Tunnel long-term displacement increases caused an overutilization of the support measures over a length of approximately 100m behind the excavation face. It was concluded that these increases were caused by a strain softening...
Proceedings Papers

Paper presented at the 15th ISRM Congress, October 9–14, 2023
Paper Number: ISRM-15CONGRESS-2023-318
...’ of properties using Rocscience software to evaluate the ‘page-wide’ Hoek-Brown equations for ‘c’ and ‘φ’ and thence to FEM. It is doubted that such methods can help us understand fundamental rock behaviour, as so-called plastic zones around underground excavations are exaggerated, and spoon-shaped ‘failures...
Proceedings Papers

Paper presented at the 15th ISRM Congress, October 9–14, 2023
Paper Number: ISRM-15CONGRESS-2023-301
... for radioactive waste. The paper presents a numerical analysis, using an especially developed constitutive model for argillaceous rocks, that reproduces successfully the observations obtained in the excavation of tunnels in Callovo-Oxfordian claystone at the Meuse/Haute-Marne underground laboratory. Particular...
Proceedings Papers

Paper presented at the 15th ISRM Congress, October 9–14, 2023
Paper Number: ISRM-15CONGRESS-2023-325
... behavior induced by shield tunneling through the rock mass and the prediction of surface settlement. INTRODUCTION Shield tunneling has been extensively applied in urban areas since it can achieve tunnel construction with minimized ground deformation by continuous excavation and support. However...
Proceedings Papers

Paper presented at the 15th ISRM Congress, October 9–14, 2023
Paper Number: ISRM-15CONGRESS-2023-279
... consider a circular tunnel excavated in a Mohr-Coulomb elastoplastic medium. The analysis accounts for a large range of ground conditions, support characteristics, lay distances and tunnel radius. The results show that ANNs models perform well with the small dataset used here and can be considered...
Proceedings Papers

Paper presented at the 15th ISRM Congress, October 9–14, 2023
Paper Number: ISRM-15CONGRESS-2023-249
... ABSTRACT: This paper studies a consecutive excavation technique to enhance the shield TBM advance rate. Helical type segments are considered for one solution for the continuous excavation of shield TBM. When using helical segments, the thrust jacks compress on the inclined side wall...
Proceedings Papers

Paper presented at the 15th ISRM Congress, October 9–14, 2023
Paper Number: ISRM-15CONGRESS-2023-284
... ABSTRACT: Thorough knowledge of brittle phenomena around underground excavations is of paramount importance for predicting the extension and shape of the failed zone and assisting in assessing adequate support and reinforcement systems. This behaviour is difficult to capture in conventional...
Proceedings Papers

Paper presented at the 15th ISRM Congress, October 9–14, 2023
Paper Number: ISRM-15CONGRESS-2023-336
... case 2 mathematics of computing assimilation settlement ensemble vector excavation crown settlement reservoir geomechanics numerical experiment position prediction underground structure construction phase tunnel construction figure 3 15th ISRM Congress 2023 & 72nd Geomechanics...
Proceedings Papers

Paper presented at the 15th ISRM Congress, October 9–14, 2023
Paper Number: ISRM-15CONGRESS-2023-274
... between experimental measurements and numerical predictions, indicating the accuracy of the implemented creep law. INTRODUCTION Deep excavation in squeezing grounds for tunnel engineers normally implies large sometimes excessive tunnel convergences. The development of such deformations usually takes...
Proceedings Papers

Paper presented at the 15th ISRM Congress, October 9–14, 2023
Paper Number: ISRM-15CONGRESS-2023-299
... construction stages consisting excavating pilot tunnels, primary lining and second lining greatly disturbed the strata. Comparing with the subway station with symmetrical pilot tunnels arrangement, the curves of surface settlement and the surface horizontal displacement generate a certain offset. The region...
Proceedings Papers

Paper presented at the 15th ISRM Congress, October 9–14, 2023
Paper Number: ISRM-15CONGRESS-2023-281
... ABSTRACT: Rock behaviour conditions the stability of deep underground exploitations. The excavations generate deformations, damage, and fractures in the surrounding rock. At engineering scale, phenomenological constitutive models are often considered; however, macroscale behaviour takes its...
Proceedings Papers

Paper presented at the 15th ISRM Congress, October 9–14, 2023
Paper Number: ISRM-15CONGRESS-2023-311
... and evaluate the impact of the excavation phases on the nearby existing structures, 2D and 3D finite element and finite difference models were realized, allowing to design both the rock-supports and the concrete inner lining for all the structures. The observational method was applied during the construction...
Proceedings Papers

Paper presented at the 15th ISRM Congress, October 9–14, 2023
Paper Number: ISRM-15CONGRESS-2023-341
... geologist europe government lining excavation tunnel utilization geological subdiscipline closure austria government reservoir geomechanics lining utilization displacement shotcrete lining geology reservoir characterization shotcrete tunnelling evaluation simulation tunnel...
Proceedings Papers

Paper presented at the 15th ISRM Congress, October 9–14, 2023
Paper Number: ISRM-15CONGRESS-2023-254
... must allow control and stability of the excavations for the safety of the personnel throughout the useful life of the works. The deformation of the supported structure must be compatible with this time constraint, and it must be operationally and economically efficient. The behaviour of the rock mass...
Proceedings Papers

Paper presented at the 15th ISRM Congress, October 9–14, 2023
Paper Number: ISRM-15CONGRESS-2023-312
... significant. The excavations proximity develops some relaxation or induced damage that if not considered, will have relevant implications on the behavior of the rock mass in the short and long term. Although some examples have been found where the impact of this type of damage is exposed (Jessu et al , 2018...

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