Abstract
The uniaxial compression tests were conducted on granite samples with different joint dip angles to more favorably explore the influences of the nonconsecutive joint on mechanical properties and deformation characteristics of the rock mass. The stress-strain curves, deformation and strength characteristics, and energy evolution process of the samples were analyzed. Numerical simulation using particle flow code (PFC) is employed to study the crack propagation process. The mode of jointed and fractured rock was investigated. The research results showed a significant reduction in both the peak strength and elastic modulus of jointed samples compared with intact ones: the peak strength and elastic modulus drop to the minimum at the joint dip angle of about 45°, especially for the peak strength, which takes up about 55% of the intact samples. The fractured samples’ total energy, elastic strain energy, and dissipated energy during the uniaxial compression drop significantly relative to intact samples. The proportion of the fracture modes varies with different joint dip angles, in which the ratio of shear cracks grows at first and then declines, with the highest balance at the dip angle of 45°. The damage stress’s sensitivity to the dip angle change is greater than that of the peak stress, with reduction amplitude more extensive than the latter.
Highlights
Various structural planes such as fractures, interlayers, and faults generally occur in engineering rock, so such rock has quite complex structures
Rock fracture is accompanied by the initiation, propagation, and coalescence of microfractures in rock. e macroscopic mechanical properties of the rock are highly associated with the development and evolution of microfractures [5, 8,9,10,11]. us, initial microfractures present a vital influence on the physical and mechanical properties of rock
The influence of the joint dip angle on mechanical parameters and fracture energy evolution during failure of rock samples was explored by performing the uniaxial compression test
Summary
Received 24 September 2021; Accepted 23 October 2021; Published 18 November 2021. e uniaxial compression tests were conducted on granite samples with different joint dip angles to more favorably explore the influences of the nonconsecutive joint on mechanical properties and deformation characteristics of the rock mass. e stress-strain curves, deformation and strength characteristics, and energy evolution process of the samples were analyzed. E uniaxial compression tests were conducted on granite samples with different joint dip angles to more favorably explore the influences of the nonconsecutive joint on mechanical properties and deformation characteristics of the rock mass. E stress-strain curves, deformation and strength characteristics, and energy evolution process of the samples were analyzed. E mode of jointed and fractured rock was investigated. E fractured samples’ total energy, elastic strain energy, and dissipated energy during the uniaxial compression drop significantly relative to intact samples. E proportion of the fracture modes varies with different joint dip angles, in which the ratio of shear cracks grows at first and declines, with the highest balance at the dip angle of 45°. Numerical simulation using particle flow code (PFC) is employed to study the crack propagation process. e mode of jointed and fractured rock was investigated. e research results showed a significant reduction in both the peak strength and elastic modulus of jointed samples compared with intact ones: the peak strength and elastic modulus drop to the minimum at the joint dip angle of about 45°, especially for the peak strength, which takes up about 55% of the intact samples. e fractured samples’ total energy, elastic strain energy, and dissipated energy during the uniaxial compression drop significantly relative to intact samples. e proportion of the fracture modes varies with different joint dip angles, in which the ratio of shear cracks grows at first and declines, with the highest balance at the dip angle of 45°. e damage stress’s sensitivity to the dip angle change is greater than that of the peak stress, with reduction amplitude more extensive than the latter
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