EXPERIMENTAL STUDY ON THE DAMAGE AND FAILURE PROPERTIES OF ROCK-LIKE MATERIAL WITH PRE-EXISTING DOUBLE FLAWS UNDER UNIAXIAL COMPRESSION
首发时间:2014-09-17
Abstract:Based on digital image correlation (DIC) method and self-developed code, the global strain field changing and failure properties of rock-like materials with pre-existing double flaws are experimentally studied under uniaxial compression. By theoretical analysis with linear elastic fracture mechanics (LEFM), strain approach proves to be practicable to investigate cracking process. Thus, two types of process zone are defined to discuss the specimen's coalescence evolution at different loading phase. Crack initiation, propagation, and coalescence is a process of process zone development and nucleation. DIC strain field results are studied on meso-level using strain approach. In shear coalescence mode, SPZ (shear process zone) in bridge area coalesces with each other, while TPZ (tensile process zone) grows independently. In general, the paper try to establish the link between microscopic mechanical mechanism and macroscopic mechanical response in flawed rock. Further research should be done to study the cracking process and its effect on rock strength in detail by DIC method.
keywords: Rock-like material, Double flaws, Rock Bridge, Global strain field, Damage evolution
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EXPERIMENTAL STUDY ON THE DAMAGE AND FAILURE PROPERTIES OF ROCK-LIKE MATERIAL WITH PRE-EXISTING DOUBLE FLAWS UNDER UNIAXIAL COMPRESSION
摘要:Based on digital image correlation (DIC) method and self-developed code, the global strain field changing and failure properties of rock-like materials with pre-existing double flaws are experimentally studied under uniaxial compression. By theoretical analysis with linear elastic fracture mechanics (LEFM), strain approach proves to be practicable to investigate cracking process. Thus, two types of process zone are defined to discuss the specimen's coalescence evolution at different loading phase. Crack initiation, propagation, and coalescence is a process of process zone development and nucleation. DIC strain field results are studied on meso-level using strain approach. In shear coalescence mode, SPZ (shear process zone) in bridge area coalesces with each other, while TPZ (tensile process zone) grows independently. In general, the paper try to establish the link between microscopic mechanical mechanism and macroscopic mechanical response in flawed rock. Further research should be done to study the cracking process and its effect on rock strength in detail by DIC method.
关键词: Rock-like material, Double flaws, Rock Bridge, Global strain field, Damage evolution
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EXPERIMENTAL STUDY ON THE DAMAGE AND FAILURE PROPERTIES OF ROCK-LIKE MATERIAL WITH PRE-EXISTING DOUBLE FLAWS UNDER UNIAXIAL COMPRESSION
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