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论文类型：期刊论文

发表时间：2022-06-30

发表刊物：岩土力学

期号：12

页面范围：3251-3255,3260

ISSN号：1000-7598

摘要：Tensile strength is an important mechanical property of rock. In Brazil test of a flattened disk specimen measuring tensile strength of rock, the central angle of the flats has great influence on measuring tensile strength. But there is no restriction in the test, which makes tensile strength of rock obtained by the test very scattering. Digital image processing methods are used as a measurement tool to construct a numerical representation for the actual spatial distribution of different materials and components in rock samples, which is introduced into rock failure process analysis (RFPA2D), and numerical model of Brazil tests of granite flattened Brazilian disk specimen which considers the actual heterogeneity is established by processing its digital image. Using the numerical model, the influences of central angle of flats on stress distribution along axial line, splitting failure modes and tensile strength are analyzed; and reasonable range of central angle of flats is obtained, which should be in the range of 20° 30°.

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