Abstract
In this paper, uniaxial compression tests and digital image correlation (DIC) are combined to test samples of artificial rocks manufactured with preexisting cracks at different inclinations. The influence of these fractures on the mechanical properties of the rock and the deformation field in the rock were studied by recording and analyzing the forms of fracturing at specimen failure, crack propagation modes, crack initiation angles, and other features. The results show that the rupture modes of the specimens can be divided into two types: splitting and shear slip. The corresponding fracture types are wing fractures and secondary fractures. As the inclination angle of the prefabricated crack is increased, the wing crack propagation angle first decreases and then increases; the propagation angle is smallest when the inclination angle is 30°. The peak stress and the crack initiation stress ratios increases with the increase of the prefabricated fracture inclination angle .As a specimen is failing, the displacement in the specimen is mainly on the left side of the slip surface composed of a prefabricated crack and a wing crack and the lateral strain is mainly concentrated around the slip surface. This time interval (the time between peak stress and first appearance of a crack on the specimen’s surface) and the magnitude of the peak stress display a good positive correlation. DIC technology can be used to monitor this relationship and provide early warning of deformation and failure for a rock mass in a mine or other engineering project.
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Acknowledgements
The authors express their gratitude for the grants provided by the National Natural Science Foundation of China (Nos. 41602295, U1704243, 41602298,) and the Doctoral Student Innovation Foundation of North China University of Water Resources and Electric Power. The work was partially supported by the High-level Talents Foundation of the North China University of Water Resources and Electric Power (201501001). The Henan Institution of Higher Education Key Scientific Research Project (16A410004) are acknowledged The authors also wish to thank the anonymous reviewers for their constructive comments.
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Jiang, T., Pan, X., Lei, J. et al. Rupture and Crack Propagation in Artificial Soft Rock with Preexisting Fractures Under Uniaxial Compression. Geotech Geol Eng 37, 1943–1956 (2019). https://doi.org/10.1007/s10706-018-0736-z
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DOI: https://doi.org/10.1007/s10706-018-0736-z