EXPERIMENTAL STUDY ON THE DAMAGE AND FAILURE PROPERTIES OF ROCK-LIKE MATERIAL WITH PRE-EXISTING DOUBLE FLAWS UNDER UNIAXIAL COMPRESSION

ZHAO Cheng; BAO Chong; Matsuda Hiroshi; ZHAO Chunfeng; TIAN Jiashen

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EXPERIMENTAL STUDY ON THE DAMAGE AND FAILURE PROPERTIES OF ROCK-LIKE MATERIAL WITH PRE-EXISTING DOUBLE FLAWS UNDER UNIAXIAL COMPRESSION

ZHAO Cheng 1 *,BAO Chong 2,Matsuda Hiroshi 1,ZHAO Chunfeng 2,TIAN Jiashen 3

1.Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China

2. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, China

3.Department of Structural Engineering, Nagasaki University, Nagasaki, 852-8521 Japan

*Correspondence author

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Funding: Ph.D. Programs Foundation of Ministry of Education of China （No.20110072120011）, Natural Science Foundation of China （No.41202193）

Opened online:17 September 2014

Accepted by: none

Citation: ZHAO Cheng,BAO Chong,Matsuda Hiroshi.EXPERIMENTAL STUDY ON THE DAMAGE AND FAILURE PROPERTIES OF ROCK-LIKE MATERIAL WITH PRE-EXISTING DOUBLE FLAWS UNDER UNIAXIAL COMPRESSION[OL]. [17 September 2014] http://en.paper.edu.cn/en_releasepaper/content/4609460

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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