Fracture Characteristics and Tensile Strength Prediction of Rock–Concrete Composite Discs Under Radial Compression

Tengfei Guo, Houqiang Wang, Xuefeng Si (), Chengzhi Pu, Zhixiang Liu, Qi Zhang and Weijun Liu
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Tengfei Guo: School of Resources Environment and Safety Engineering, University of South China, Hengyang 421001, China
Houqiang Wang: School of Resources and Safety Engineering, Central South University, Changsha 410017, China
Xuefeng Si: School of Resources Environment and Safety Engineering, University of South China, Hengyang 421001, China
Chengzhi Pu: School of Resources Environment and Safety Engineering, University of South China, Hengyang 421001, China
Zhixiang Liu: School of Resources and Safety Engineering, Central South University, Changsha 410017, China
Qi Zhang: School of Resources and Safety Engineering, Central South University, Changsha 410017, China
Weijun Liu: School of Resources and Safety Engineering, Central South University, Changsha 410017, China

Mathematics, 2024, vol. 12, issue 22, 1-19

Abstract: To investigate the fracture mechanism of rock–concrete (R–C) systems with an interface crack, Brazilian splitting tests were conducted, with a focus on understanding the influence of the interface crack angle on failure patterns, energy evolution, and RA/AF characteristics. The study addresses a critical issue in rock–concrete structures, particularly how crack propagation differs with varying crack angles, which has direct implications for structural integrity. The experimental results show that the failure paths in R–C disc specimens are highly dependent on the interface crack angle. For crack angles of 0°, 15°, 30°, and 45°, cracks initiate from the tips of the interface crack and propagate toward the loading ends. However, for angles of 60°, 75°, and 90°, crack initiation shifts away from the interface crack tips. The AE parameters RA (rise time/amplitude) and AF (average frequency) were used to characterize different failure patterns, while energy evolution analysis revealed that the highest percentage of energy consumption occurs at a crack angle of 45°, indicating intense microcrack activity. Moreover, a novel tensile strength prediction model, incorporating macro–micro damage interactions caused by both microcracks and macrocracks, was developed to explain the failure mechanisms in R–C specimens under radial compression. The model was validated through experimental results, demonstrating its potential for predicting failure behavior in R–C systems. This study offers insights into the fracture mechanics of R–C structures, advancing the understanding of their failure mechanisms and providing a reliable model for tensile strength prediction.

Keywords: rock–concrete; interface crack; failure mode; RA/AF; energy evolution; Weibull distribution; Drucker–Prager (DP) criterion; tensile strength prediction (search for similar items in EconPapers)
JEL-codes: C (search for similar items in EconPapers)
Date: 2024
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