Abstract
In order to better analyze the mechanical behavior of rock in uniaxial compression and Brazilian splitting, numerical model was established according to laboratory test by PFC2D particle flow program, and the simulation results were compared with the experimental results. The results show that when the rock reaches the peak stress, the failure curve of cement appears an obvious turning point, and the failure rate of cement increases.The compressive strength of rock is much greater than the tensile strength under compression condition. The preloading method is more detailed for experimental restoration, and it provides certain reference significance for rock simulation in the future.
Highlights
Rock is a kind of brittle material with natural nonuniformity
The ratio of the compressive strength of uniaxial compression to the tensile strength obtained by Brazilian splitting is 10, and the ratio of the elastic modulus of uniaxial compression to the elastic model of Brazilian splitting is 29.73
It can be seen that the compressive strength of the rock under compression is much greater than the tensile strength, which is consistent with some conclusions[10] and verifies the accuracy of the model in this paper
Summary
Rock is a kind of brittle material with natural nonuniformity. It is composed of tiny mineral particles bonded to each other and contains many tiny joints and fissures. Chen Zhajun et al.[3] conducted Brazilian splitting and conventional uniaxial compression tests on sand slate, sandstone and mudstone to explore the mechanical properties and failure correlation characteristics of these three kinds of rocks. Shen Haimeng et al.[5] conducted uniaxial compression test using PFC2D particle flow program to explore the brittle failure process of salt rocks under different stress conditions. Uniaxial compression and Brazilian splitting are the most basic test methods to study the mechanical characteristics of rocks, In this paper, the numerical simulation of uniaxial compression and Uniaxial compression was carried out respectively to explore the damage evolution law of rock fracture in the process of uniaxial compression from a microscopic perspective, and analyzed the correlation characteristics between Brazilian.
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