Experimental Study and Numerical Simulation Analysis of Crack Propagation Characteristics of Crisscross Fracture
Received date: 2020-01-02
Revised date: 2020-05-21
Online published: 2020-08-27
Defects in rocks make their physical properties anisotropic.When subjected to external force，the defect will crack，expand and even destroy.Therefore，it is very important to study its failure behavior to predict the instability of engineering structure.Previous studies are more concentrated on the evolution process of single fracture or non intersecting multi fracture，however，rock fracture often exists in the form of intersecting multi fracture in practical engineering.Based on RMT-150B，the cross fracture rock samples （150 mm×200 mm×45 mm） with different fracture inclination were prepared in the laboratory，and the uniaxial compression test was carried out with the displacement controlled loading mode of 0.01 mm/s.The results show that the peak strength and modulus of elasticity of the cross fracture specimen are lower than that of the intact specimen.The peak strength，modulus of elasticity and crack initiation stress increase first and then decrease with the increase of fracture inclination.In order to make up for the shortcomings of laboratory test technology in reflecting the macro and micro morphology of cross cracks，PFC2D numerical simulation technology was used to calibrate the micro parameters of the numerical model by comparing the deformation and failure characteristics of the complete specimen.The results of numerical simulation show that the relationship between peak strength，modulus of elasticity，initial crack stress and crack inclination is basically consistent with the results of laboratory tests.From the process of crack evolution，it is observed that the inclination angle of 0° is the simultaneous cracking from the tip of the primary and secondary cracks，the inclination angle of 30° is the crack initiation from the tip of the primary crack，and the inclination angle of 45° and 60° are the cracks from the tip of the secondary crack.The number curves of microcracks are divided into four stages，namely quiescent period, slow increase period, mid-term increase period, and most active period，and the growth rate of the latter stage is always higher than that of the former stage，the change characteristics of cracks are different in different stages.It can be clearly seen from the displacement field that when the inclination angles are 0°，30° and 45°respectively，the specimen is the diagonal shear failure controlled by the secondary fracture.When the inclination angle is 60°，the specimen is mainly the shear failure controlled by the main fracture.
Guicheng HE , Kexu CHEN , Bing DAI , Chengcheng WANG . Experimental Study and Numerical Simulation Analysis of Crack Propagation Characteristics of Crisscross Fracture[J]. Gold Science and Technology, 2020 , 28(4) : 509 -520 . DOI: 10.11872/j.issn.1005-2518.2020.04.029
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