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Bulletin of Engineering Geology and the Environment

Erschienen in:

01.08.2024 | Original Paper

Study on large deformation mechanism and control technology of layered carbonaceous slate in deep tunnels

verfasst von: Bo Zhang, Zhigang Tao, Xiaobing Qiao, Zhijiao Wang

Erschienen in: Bulletin of Engineering Geology and the Environment | Ausgabe 8/2024

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Abstract

To address the large deformation of a layered soft rock tunnel, the Muzhailing Tunnel was selected as the research subject, and an anchor cable made of Negative Poisson's ratio steel (NPR anchor cable) was used for the tunnel support. A combined approach of laboratory experiments, numerical simulations, and field tests was utilized to analyze the deformation mechanisms of layered carbonaceous shale under high ground stress, and a support scheme with an NPR steel anchor cable was proposed. The mechanical properties of the NPR anchor cable were studied using laboratory static tensile tests. The results indicated that NPR anchor cables exhibit constant tension and uniform stretching during the stretching process, with no apparent necking phenomenon upon fracture. By establishing a DFN-DEM tunnel numerical model and simulating the deformation progression of surrounding rocks with varying joint dip angles, the large deformation mechanism of rock bending and shear slip in the Muzhailing Tunnel was elucidated. The field application tests of the NPR anchor cable validated its efficacy in controlling large deformations of the rock mass, providing new support materials and methods for large deformation support in soft rock tunnels.

Vorheriger Artikel Predicting the performance of a functional ecological substrate via a generative model based on an orthogonal experiment

Nächster Artikel Deterministic approach to assess landslide susceptibility and landslide activity in the Central-Western Region of Slovakia

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Titel: Study on large deformation mechanism and control technology of layered carbonaceous slate in deep tunnels
verfasst von: Bo Zhang
Zhigang Tao
Xiaobing Qiao
Zhijiao Wang
Publikationsdatum: 01.08.2024
Verlag: Springer Berlin Heidelberg
Erschienen in: Bulletin of Engineering Geology and the Environment / Ausgabe 8/2024
Print ISSN: 1435-9529
Elektronische ISSN: 1435-9537
DOI: https://doi.org/10.1007/s10064-024-03820-9

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