The fracture patterns of brittle materials in different stress loading modes are different. In order to study the fracture char- acteristics of brittle materials under conﬁning pressure, in this study, both uniaxial compression tests and loading conﬁning pressure tests were conducted on three concrete samples of different strengths, respectively. Meanwhile, the failure process of the samples during the loading of conﬁning pressure was monitored using an acoustic wave tester; ﬁnally, the failure characteristics of the concrete samples were further investigated on a mesoscopic level by carrying out numerical simulations. The test results show that different failure modes were revealed in the concrete samples subjected to uniaxial compression: The failure initially started at both ends and then gradually extended to the middle part along the longitudinal direction; eventually, splitting failure, single inclined plane shear failure and conjugated inclined plane shear failure occurred. However, as the conﬁning pressure was loaded, the samples failed merely in a simple mode, that is, the fractures occurred around the middle parts of the samples, perpendicular to the specimens axis. According to the acoustic measurements, the local failure processes before fracturing under conﬁning pressure were consistent with those under uniaxial compression. The simulation results suggest that
Arabian Journal for Science and Engineering – Springer Journals
Published: Jun 4, 2018
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