A Study of the Flexural Performance of Fiber-Reinforced Anchored Shotcrete Single-Layer Lining in a Hard Rock Tunnel Based on the Thickness Ratio
Source abstract
Abstract
Aiming at the unclear bearing mechanism of the single-layer lining structure of high-performance fiber shotcrete under layered construction in the hard rock section of a highway tunnel, this paper studies the effect of different thickness ratios under layered construction on the flexural performance of the single-layer lining structure. Six types of thickness ratio specimens were subjected to a four-point bending test. The tests employed 3D digital image correlation technology to record and analyze the deformation and failure process of the specimens, and the calculation method of single-layer lining flexural stiffness was modified. The results indicate that the flexural ultimate load of the specimens is achieved at a thickness ratio of 2, which is 20.9% higher compared to a thickness ratio of 0. Layered construction affects the failure mode of the specimens. All specimens exhibit mixed-mode failure. However, with the increase in the thickness ratio, the percentage of flexural failure cracks gradually increases. Under layered construction, the reduction in the effective bending stiffness of fiber shotcrete beams becomes more pronounced as the thickness ratio increases. Based on these findings, the interface influence factor is proposed, and the flexural stiffness is corrected using composite beam theory.
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Research context
OpenAlex topics: Geotechnical Engineering and Underground Structures · Geotechnical Engineering and Analysis · Grouting, Rheology, and Soil Mechanics
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Affiliations
China Merchants Chongqing Communications Technology Research & Design Institute Co., Ltd., Chongqing 400060, China
School of Civil Engineering, Chongqing University, Chongqing 400044, China
Funding
Fund of the National Engineering and Research Center for Mountainous Highways · Natural Science Foundation of Chongqing
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