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Analysis of uniaxial compression of rock mass with parallel cracks based on experimental study and PFC2D numerical simulation

Yang Jie, Chen Haijun, Liangxiao Xiong, Xu Zhongyuan, Zhou Tao, Yang Changheng

Archives of Civil Engineering

2022

Vol. 68, nr 1

111--128

In this study, the uniaxial compression test and the numerical simulation of the two-dimensional particle flow code (PFC2D) were used to study the mechanical properties and failure laws of rock masses with parallel cracks. The experiment considers the influences of crack length (l), crack angle (β1L β2), and numerical changes in the rock bridge length (ℎ) and bridge angle (α) on failures of rock-like specimens. The results indicate that the uniaxial compressive strength (UCS) of the rock-like specimens with parallel cracks decreases with increasing l under different α values. The smaller angle between the preset crack and the loadinging direction (β) resulting in higher UCS. In addition, a larger ℎ results in higher UCS in the specimen. When β1 or β2 is fixed, the UCS and elastic modulus of the specimen show an ‘M’ shape with an increase in α. Moreover, the crack growth or failure mode of samples with different l values is similar. When β1 or β2 is small, the failure of the specimen is affected by the development and expansion of wing cracks. If one of β1 and β2 is large, the failure of the specimen is dominated by the expansion and development of the secondary cracks which is generated at the tip of the prefabricated crack. Furthermore, when the angle between the prefabricated crack and the loading direction is β1 = 0º, the rock bridge is less likely to reach penetration failure as ℎ increases. Secondary crack connections between the prefabricated cracks occur only when α is small.