Triaxial mechanical properties and precursors of instability damage in rocks with different laminar dip angles

作     者：SUN Xiaoming SHI Fukun DING Jiaxu TAO Zhigang HE Linsen YANG Liu ZHANG Yong MIAO Chengyu SUN Xiaoming;SHI Fukun;DING Jiaxu;TAO Zhigang;HE Linsen;YANG Liu;ZHANG Yong;MIAO Chengyu

作者机构：Inner Mongolia Research InstituteChina University of Mining and Technology(Beijing)Beijing 100083China State Key Laboratory for Tunnel EngineeringChina University of Mining and Technology(Beijing)Beijing 100083China 

出 版 物：《Journal of Mountain Science》 (山地科学学报（英文）)

年 卷 期：2024年第21卷第2期

页      面：648-661页

核心收录：

学科分类：08[工学] 080104[工学-工程力学] 0815[工学-水利工程] 0801[工学-力学（可授工学、理学学位）] 

基　　金：funded by the National Natural Science Foundation of China(Grant Nos.52174096 42277174) 

主　　题：Volcanic breccia Bedding dip Acoustic emission Fractal dimension Harbinger of destruction 

摘      要：To investigate the mechanical failure characteristics of volcanic breccia with different bedding dip angles in deep layers,triaxial compression experiments were conducted on specimens taken from volcanic rock layers in the Junggar Basin,*** changing the confining pressure,we compared the mechanical properties,acoustic emission characteristics,and fractal features of the acoustic emission sequence for volcanic breccia with different bedding dip *** research results indicate that as the bedding dip angle increases,peak strength,internal friction angle,and cohesion exhibit a“U-shapedvariation *** correlation dimension of the acoustic emission amplitude was calculated using the G-P algorithm,revealing that volcanic breccia exhibits fractal ***,a positive correlation between the correlation dimension and the bedding dip angle was *** the stress of the test specimen reaches 0.8σ_(c),there is a significant decrease in the fractal dimension,serving as a criterion for predicting the failure of the *** analyzing the changes in fractal dimension at different stress levels,the slope of the fractal dimension△D-0.5 can be used as a precursor to failure for test specimens with a bedding dip angle of 15°≤β≤45°.Similarly,when the bedding dip angle of the specimen is 0°≤β15°or 45°β≤90°,△D0 can be considered as a precursor to specimen *** study provides theoretical references for understanding the failure patterns of volcanic rock.