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Rock Mechanics and Rock Engineering

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22.07.2022 | Original Paper

Stability Evaluation Method and Support Structure Optimization of Weak and Fractured Slate Tunnel

verfasst von: Ping Zhou, Yifan Jiang, Feicong Zhou, Lun Gong, Wenge Qiu, Jingwen Yu

Erschienen in: Rock Mechanics and Rock Engineering | Ausgabe 10/2022

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Abstract

In order to solve the problems of large deformation and cracking of the fractured slate tunnel lining, a tunnel stability evaluation method that can be used for fractured slate tunnels is proposed, and the supporting structure is explored. With the help of mechanical test and XRD, the mechanical properties and degradation mechanism of slate are obtained, and the mechanical parameters of fractured slate rock mass are determined according to Hoek–brown criterion. Combined with the distribution characteristics of slate, a method for calculating the tunnel safety factor is proposed after analyzing the law of buried depth and distribution characteristics of slate on the tunnel stability by using the strength reduction method. Compared with the on-site lining failure event, the two safety factors of 1.31 and 1.4 are determined. For crossing conditions with a safety factor lower than the safety standard, the application of compression support can effectively release the deformation energy of soft rock and greatly reduce the stress value of the support structure.

Vorheriger Artikel Assessing Slope Stability with an Improved 3D Numerical Manifold Method

Nächster Artikel Mineral Composition and Grain Size Effects on the Fracture and Acoustic Emission (AE) Characteristics of Rocks Under Compressive and Tensile Stress

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Titel: Stability Evaluation Method and Support Structure Optimization of Weak and Fractured Slate Tunnel
verfasst von: Ping Zhou
Yifan Jiang
Feicong Zhou
Lun Gong
Wenge Qiu
Jingwen Yu
Publikationsdatum: 22.07.2022
Verlag: Springer Vienna
Erschienen in: Rock Mechanics and Rock Engineering / Ausgabe 10/2022
Print ISSN: 0723-2632
Elektronische ISSN: 1434-453X
DOI: https://doi.org/10.1007/s00603-022-02974-w

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