Study on Crack Propagation and Coalescence in Fractured Limestone Based on 3D-DIC Technology

Yanyan Peng, Xiao Cheng, Nan Song, Qi Qin, Xiaoyun Zhang and Manchao He
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Yanyan Peng: School of Civil Engineering, Shaoxing University, Shaoxing 312000, China
Xiao Cheng: School of Civil Engineering, Shaoxing University, Shaoxing 312000, China
Nan Song: School of Civil Engineering, Shaoxing University, Shaoxing 312000, China
Qi Qin: School of Civil Engineering, Shaoxing University, Shaoxing 312000, China
Xiaoyun Zhang: School of Civil Engineering, Shaoxing University, Shaoxing 312000, China
Manchao He: Key Laboratory of Rock Mechanics and Geohazards of Zhejiang Province, Shaoxing 312000, China

Energies, 2022, vol. 15, issue 6, 1-16

Abstract: To deeply understand the influence of crack inclination angle on crack propagation and coalescence in fractured limestone, uniaxial compression tests were carried out on limestone specimens with prefabricated cracks. The strain field evolution diagram of the failure process of the specimens was obtained using 3D digital image correlation technology (3D-DIC technology). This, in combination with the crack propagation diagram, was used to analyze the entire failure process of the limestone specimens. The test results show that the evolution process of the principal strain field agrees well with the process of crack initiation, propagation, and coalescence. The crack development process is the process of the high strain zones consistently propagating and also the process of micro-cracks appearing, developing, and nucleating to form macro-cracks. With the increase in the parallel crack inclination angle, the stress concentration zone of the intermediate crack transfers from both ends of the crack to the middle. Meanwhile, the coalescing crack type between the parallel crack and the intermediate crack changes from a coexisting tensile crack and tensile-shear crack to a single tensile crack. With the increase in the parallel crack inclination angle, the failure of the fractured limestone specimens changes from simple splitting or tensile failure to the coexistence of tensile-shear fracture and splitting. 3D-DIC technology provides an effective method to study crack propagation and coalescence during rock failure.

Keywords: 3D-DIC technology; uniaxial compression; mechanical characteristics; crack propagation; principal strain nephogram (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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