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Evolution and triggering mechanism of fault-slip rockbursts in deep tunnels: Insights from 3D printed large-scale physical models

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Titel: Evolution and triggering mechanism of fault-slip rockbursts in deep tunnels: Insights from 3D printed large-scale physical models
Autoren: Shi-Ming Mei, Xia-Ting Feng, Zheng-Wei Li, Ben-Guo He, Cheng-Xiang Yang, Wei Zhang
Quelle: Journal of Rock Mechanics and Geotechnical Engineering, Vol 17, Iss 11, Pp 6821-6836 (2025)
Verlagsinformationen: Elsevier, 2025.
Publikationsjahr: 2025
Bestand: LCC:Engineering geology. Rock mechanics. Soil mechanics. Underground construction
Schlagwörter: Fault-slip rockbursts, Evolution mechanism, 3D printing, Large-scale physical model test, Deep tunnel, Engineering geology. Rock mechanics. Soil mechanics. Underground construction, TA703-712
Beschreibung: The excavation of deep tunnels crossing faults is highly prone to triggering rockburst disasters, which has become a significant engineering issue. In this study, taking the fault-slip rockbursts from a deep tunnel in southwestern China as the engineering prototype, large-scale three-dimensional (3D) physical model tests were conducted on a 3D-printed complex geological model containing two faults. Based on the self-developed 3D loading system and excavation device, the macroscopic failure of fault-slip rockbursts was simulated indoors. The stress, strain, and fracturing characteristics of the surrounding rock near the two faults were systematically evaluated during excavation and multistage loading. The test results effectively revealed the evolution and triggering mechanism of fault-slip rockbursts. After the excavation of a high-stress tunnel, stress readjustment occurred. Owing to the presence of these two faults, stress continued to accumulate in the rock mass between them, leading to the accumulation of fractures. When the shear stress on a fault surface exceeded its shear strength, sudden fault slip and dislocation occurred, thus triggering rockbursts. Rockbursts occurred twice in the vault between the two faults, showing obvious intermittent characteristics. The rockburst pit was controlled by two faults. When the faults remained stable, tensile failure predominated in the surrounding rock. However, when the fault slip was triggered, shear failure in the surrounding rock increased. These findings provide valuable insights for enhancing the comprehension of fault-slip rockbursts.
Publikationsart: article
Dateibeschreibung: electronic resource
Sprache: English
ISSN: 1674-7755
Relation: http://www.sciencedirect.com/science/article/pii/S1674775525002100; https://doaj.org/toc/1674-7755
DOI: 10.1016/j.jrmge.2025.04.010
Zugangs-URL: https://doaj.org/article/4b1970144ac94f019acaf88d116c11a2
Dokumentencode: edsdoj.4b1970144ac94f019acaf88d116c11a2
Datenbank: Directory of Open Access Journals
Beschreibung
Abstract:The excavation of deep tunnels crossing faults is highly prone to triggering rockburst disasters, which has become a significant engineering issue. In this study, taking the fault-slip rockbursts from a deep tunnel in southwestern China as the engineering prototype, large-scale three-dimensional (3D) physical model tests were conducted on a 3D-printed complex geological model containing two faults. Based on the self-developed 3D loading system and excavation device, the macroscopic failure of fault-slip rockbursts was simulated indoors. The stress, strain, and fracturing characteristics of the surrounding rock near the two faults were systematically evaluated during excavation and multistage loading. The test results effectively revealed the evolution and triggering mechanism of fault-slip rockbursts. After the excavation of a high-stress tunnel, stress readjustment occurred. Owing to the presence of these two faults, stress continued to accumulate in the rock mass between them, leading to the accumulation of fractures. When the shear stress on a fault surface exceeded its shear strength, sudden fault slip and dislocation occurred, thus triggering rockbursts. Rockbursts occurred twice in the vault between the two faults, showing obvious intermittent characteristics. The rockburst pit was controlled by two faults. When the faults remained stable, tensile failure predominated in the surrounding rock. However, when the fault slip was triggered, shear failure in the surrounding rock increased. These findings provide valuable insights for enhancing the comprehension of fault-slip rockbursts.
ISSN:16747755
DOI:10.1016/j.jrmge.2025.04.010