Crack growth analysis for rock-like materials with ordered multiple pre-cracks under biaxial compression  

作　　者：WANG Min CAO Ping WAN Wen ZHAO Yan-lin LIU Jie LIU Jing-shuo 王敏;曹平;万文;赵延林;刘杰;刘京铄

机构地区：[1]School of Resources and Safety Engineering, Central South University, Changsha 410083, China [2]Hunan Provincial Key Laboratory of Shale Gas Resource Utilization (Hunan University of Science and Technology), Xiangtan 411201, China [3]School of Energy and Safety Engineering, Hunan University of Science and Technology, Xiangtan 411201, China [4]Department of Hydraulic Engineering, Hunan Polytechnic of Water Resources and Electric Power Changsha 410131, China

出　　处：《Journal of Central South University》2017年第4期866-874,共9页中南大学学报（英文版）

基　　金：Project(E21527)supported by the Open Research Fund Program of Hunan Provincial Key Laboratory of Shale Gas Resource Utilization,China;Project(2015zzts077)supported by the Fundamental Research Funds for the Central Universities,China;Projects(51174088,51174228)supported by the National Natural Science Foundation of China;Project(2013CB035401)supported by the National Basic Research Program of China

摘　　要：The pre-burying iron sheets approach was used to prepare rock-like materials with ordered multiple pre-cracks. 60 specimens in total were prepared in these experiments. Through biaxial compression experiments, the influence of both the number of pre-cracks and pre-cracks angles to crack growth was analyzed. Meanwhile, species of rock bridge failure were summarized, namely, wing crack, secondary shear crack between horizontal pre-cracks and secondary shear crack between vertical pre-cracks. The wing crack plays a significant role in crack growth. Furthermore, fractal dimension was adopted to describe quantitatively the crack growth during the failure process. The results indicate that with the failure of specimens, corresponding fractal dimension for specimen monotonically increases, which indicates that the fractal dimension can be considered to the failure of the specimens quantitatively.The pre-burying iron sheets approach was used to prepare rock-like materials with ordered multiple pre-cracks. 60 specimens in total were prepared in these experiments. Through biaxial compression experiments, the influence of both the number of pre-cracks and pre-cracks angles to crack growth was analyzed. Meanwhile, species of rock bridge failure were summarized, namely, wing crack, secondary shear crack between horizontal pre-cracks and secondary shear crack between vertical pre-cracks. The wing crack plays a significant role in crack growth. Furthermore, fractal dimension was adopted to describe quantitatively the crack growth during the failure process. The results indicate that with the failure of specimens, corresponding fractal dimension for specimen monotonically increases, which indicates that the fractal dimension can be considered to the failure of the specimens quantitatively.

关 键 词：CRACK growth WING CRACK secondary SHEAR CRACK vertical pre-cracks FRACTAL DIMENSION 

分 类 号：TU452[建筑科学—岩土工程]