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Mechanical Properties and Correlation Analysis of Interlayer Region Between Rock and Extreme Environmentally Adapted Concrete.

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Title: Mechanical Properties and Correlation Analysis of Interlayer Region Between Rock and Extreme Environmentally Adapted Concrete.
Authors: Sun, Junqi1 (AUTHOR), Wang, Yuting1 (AUTHOR), Chen, Meng1,2 (AUTHOR) chenmeng@mail.neu.edu.cn, Yang, Xinming1 (AUTHOR), Zhang, Tong1 (AUTHOR)
Source: Rock Mechanics & Rock Engineering. Jun2026, Vol. 59 Issue 6, p7063-7083. 21p.
Subject Terms: *Interfacial bonding, *Interfacial roughness, *Mechanical behavior of materials, *Extreme environments, *Statistical correlation, *Fiber-reinforced concrete, *Petrology
Abstract: High-performance concrete is often used as the supporting material for tunnels and dams, forming a composite structure with the external rock. The tensile and shear properties at the interlayer region between high-performance concrete and rock determine the stability of the support system in extreme environments. In this study, the effects of joint roughness coefficient (JRC), rock types and test methods on the interfacial mechanical properties of the rock–steel fiber-reinforced concrete (SFRC) composite are investigated. The experimental results show that the interfacial tensile and shear strengths of the composite increase with increasing JRC, and the bonding between soft rock and SFRC is better than that of hard rock. The interfacial tensile strength of rock–SFRC composites increased by 16.39–63.93% when the JRC increased from 4 to 20. The increased JRC extends the contact profile length and increases the contact area to enhance adhesion. Interfacial tensile and shear strength prediction equations are obtained through exponential and linear fitting, which can estimate the interfacial strength in engineering design. Correlation coefficients and grey correlation analysis quantified relationships between compressive strength, JRC, and interfacial mechanism properties. Compressive strength has a dominant influence on interfacial splitting tensile strength and shear strength compared to JRC. Furthermore, experimental results and related research have revealed the interfacial bond strength formed by the combined effects of physical anchoring and chemical interactions. This study provides a theoretical basis for the optimization of high-performance concrete in rock engineering. Highlights. Tensile and shear behavior of rock–steel fiber-reinforced concrete composites were analyzed by failure pattern, strength, and correlation analysis. The influence of joint roughness coefficient, rock types, and test methods on interfacial mechanical properties was quantitative. Grey correlation analysis was used to investigate the correlation of interfacial mechanical properties and experimental methods. The interfacial bonding strengths resulting from physical and chemical combinations were clarified. [ABSTRACT FROM AUTHOR]
Database: Energy & Power Source
Description
Abstract:High-performance concrete is often used as the supporting material for tunnels and dams, forming a composite structure with the external rock. The tensile and shear properties at the interlayer region between high-performance concrete and rock determine the stability of the support system in extreme environments. In this study, the effects of joint roughness coefficient (JRC), rock types and test methods on the interfacial mechanical properties of the rock–steel fiber-reinforced concrete (SFRC) composite are investigated. The experimental results show that the interfacial tensile and shear strengths of the composite increase with increasing JRC, and the bonding between soft rock and SFRC is better than that of hard rock. The interfacial tensile strength of rock–SFRC composites increased by 16.39–63.93% when the JRC increased from 4 to 20. The increased JRC extends the contact profile length and increases the contact area to enhance adhesion. Interfacial tensile and shear strength prediction equations are obtained through exponential and linear fitting, which can estimate the interfacial strength in engineering design. Correlation coefficients and grey correlation analysis quantified relationships between compressive strength, JRC, and interfacial mechanism properties. Compressive strength has a dominant influence on interfacial splitting tensile strength and shear strength compared to JRC. Furthermore, experimental results and related research have revealed the interfacial bond strength formed by the combined effects of physical anchoring and chemical interactions. This study provides a theoretical basis for the optimization of high-performance concrete in rock engineering. Highlights. Tensile and shear behavior of rock–steel fiber-reinforced concrete composites were analyzed by failure pattern, strength, and correlation analysis. The influence of joint roughness coefficient, rock types, and test methods on interfacial mechanical properties was quantitative. Grey correlation analysis was used to investigate the correlation of interfacial mechanical properties and experimental methods. The interfacial bonding strengths resulting from physical and chemical combinations were clarified. [ABSTRACT FROM AUTHOR]
ISSN:07232632
DOI:10.1007/s00603-025-05076-5