Abstract
In this paper, for the engineering problem of tunnel deformation damage caused by a tunnel–landslide orthogonal system landslide in northwest China, based on similar theory, a variety of materials and their ratios were explored to make similar models according to the physical and mechanical parameters of the site engineering rock, indoor physical model tests were constructed, and monitoring techniques, such as speckle displacement strain measurement, strain acquisition, and pressure sensors, were used to test the macroscopic deformation characteristics; through the detailed analysis and law summary of the test macroscopic deformation characteristics, displacement, anchor cable axial force, and strain data, it was finally found that under the orthogonal system of tunnel and sliding surface, the damage form of tunnel lining is mainly compression damage and shear damage, and the cracks are mainly tension cracks, and the effect of tunnel primary lining on the surrounding rock support is extremely limited under the action of huge sliding force; combined with the analysis of the model deformation characteristics and the axial force curve of the anchor cable during loading, it was found that the axial force change curve is consistent with the NPR Newton force curve can be used to evaluate slope stability and predict the occurrence of landslide disasters.
Highlights
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This paper focuses on the tunnel and surrounding rock damage evolution characteristics under tunnel–landslide orthogonal and tunnel crossing sliding surface conditions.
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The evolution of displacement field, NPR anchor cable axial force, and strain field were revealed using indoor large similar physical model test.
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The mechanism of tunnel–landslide interaction within the slope and the deformation and damage characteristics of the tunnel surrounding rock were analyzed to reveal the slope deformation law under different loads.
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The stress change law of constant-resistance large deformation anchor cable (NPR anchor cable) is explored, and a landslide warning mechanism based on constant-resistance large deformation anchor cable is established.
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Acknowledgements
This work was supported by the Fundamental Research Funds for the Central Universities (Grant No. 06500229), and the opening fund of Key Laboratory of Geohazard Prevention of Hilly Mountains, Ministry of Natural Resources (Grant No. FJKLGH2023K001). Great appreciation for the editors and reviewers who give valuable suggestions on this research.
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Ma, G., Cao, H., Tao, Z. et al. Experimental Study on Deformation and Failure Characteristics and Monitoring and Early Warning of Surrounding Rock of Tunnel Crossing Sliding Surface. Rock Mech Rock Eng 56, 9035–9056 (2023). https://doi.org/10.1007/s00603-023-03543-5
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DOI: https://doi.org/10.1007/s00603-023-03543-5