Uniaxial Compressive Strength Characteristics and Crack Evolution Laws of Rock-Like Samples with Flaws

doi:10.12068/j.issn.1005-3026.2022.03.014

Abstract

Abstract: The fracture network was simplified by studying the properties of rock mass with complex fractures and identifying key fractures in rock mass. Based on 3D printing technology， rock-like samples with different flaws were respectively made. The digital image correlation(DIC)technology was used to monitor the strain field in the sample during loading. The particle flow code(PFC)was used to study the local stress distribution and failure mode in the samples. The main research results show that: 1) Compared with the intact sample， the peak strength of sample with horizontal flaws is reduced by 20.9%， and the peak strength of sample with vertical flaws is only reduced by about 3%. The degradation effect of horizontal flaws on the sample is more significant. 2) The tensile stress in the middle of the horizontal flaw is far greater than that in the end of the vertical flaw， so it is easier and earlier for the sample with horizontal flaw to produce tensile cracks， resulting in that the strength of the sample with horizontal flaw is lower than the sample with vertical flaw under the condition of equal flaw length. 3)When the length of vertical flaw in cross flaws is 1~2 times of the horizontal flaw length， the horizontal flaw in cross flaws is the key flaw to control the crack evolution and strength characteristics of samples， and the change of vertical flaw length has no significant effect on the crack evolution and strength characteristics of samples. Therefore， the cross flaws can be simplified as a horizontal flaw.

Key words: horizontal flaw; vertical flaw; strength characteristic; crack evolution; digital image correlation(DIC)technology; key flaw

CLC Number:

TU45

SUN Hao， CHEN Shuai-jun， JIN Ai-bing， ZHU Dong-feng. Uniaxial Compressive Strength Characteristics and Crack Evolution Laws of Rock-Like Samples with Flaws[J]. Journal of Northeastern University(Natural Science), 2022, 43(3): 404-413.

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