Fracture and Damage Evolution of Multiple-Fractured Rock-like Material Subjected to Compression

Author:

Liu Taoying,Cui Mengyuan,Li Qing,Yang Shan,Yu Zhanfu,Sheng Yeshan,Cao Ping,Zhou Keping

Abstract

Multiple compression tests on rock-like samples of pre-existing cracks with different geometries were conducted to investigate the strength properties and crack propagation behavior considering multi-crack interactions. The progressive failure process of the specimens was segmented into four categories and seven coalescence modes were identified due to different crack propagation mechanisms. Ultimately, a mechanical model of the multi-crack rock mass was proposed to investigate the gradual fracture and damage evolution traits of the multi-crack rock on the basis of exploring the law of the compression-shear wing crack initiation and propagation. A comparison between theory and experimental results indicated that the peak strength of the specimens with multiple fractures decreased initially and subsequently increased with the increase in the fissure inclination angles; the peak strength of specimens decreased with the increase in the density of fissure distribution.

Funder

National Natural Science Foundation of China

Publisher

MDPI AG

Subject

General Materials Science

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