轴向及环向变形加载控制方式对花岗岩力学及声发射特性影响的试验研究  

EXPERIMENTAL STUDY ON THE INFLUENCE OF AXIAL AND CIRCUMFERENTIAL DEFORMATION LOADING CONTROL MODES ON THE MECHANICAL AND ACOUSTIC EMISSION CHARACTERISTICS OF GRANITE

作　　者：徐荣超 王怡博 张圣哲 孟凡震[4] 李震[5] 高梁 阎震 XU Rongchao;WANG Yibo;ZHANG Shengzhe;MENG Fanzhen;LI Zhen;GAO Liang;YAN Zhen(College of Geosciences and Engineering,North China University of Water Resources and Electric Power,Zhengzhou 450046,China;China Water Resources and Hydropower Construction Engineering Consulting Northwest Co.,Ltd.,Xi′an 710100,China;Anhui Survey and Design Institute of Water Resources and Hydropower Co.,Ltd.,Hefei 230088,China;Faculty of Science,Qingdao University of Technology,Qingdao 266520,China;School of Civil Engineering,Henan Polytechnic University,Jiaozuo 454003,China)

机构地区：[1]华北水利水电大学,地球科学与工程学院,郑州450046 [2]中国水利水电建筑工程咨询西北有限公司,西安710100 [3]安徽省水利水电勘测设计研究总院有限公司,合肥230088 [4]青岛理工大学理学院,青岛266520 [5]河南理工大学土木工程学院,焦作454003

出　　处：《工程地质学报》2025年第1期123-134,共12页Journal of Engineering Geology

基　　金：国家自然科学基金项目(资助号:51709113,51704097);河南省重点研发专项(资助号:241111322900).

摘　　要：加载控制方式是影响岩石力学性质重要因素之一。采用轴向变形控制和环向变形控制两种加载方式,对花岗岩试样开展变形速率为0.005 mm·s^(-1)条件下的单轴压缩试验,分析两种加载控制方式对花岗岩强度、应力及应变门槛值、能量演化及声发射特性等的影响规律。结果表明,与环向变形控制方式相比,轴向变形控制加载条件下:试样的峰值强度、损伤应力、起裂应力分别高12.8%、15.1%、13.1%;峰值轴向应变、损伤轴向应变及起裂轴向应变分别大12.5%、14.3%、15.2%,而峰值环向应变、起裂环向应变分别小24.2%、16.7%;峰值总能量大23.9%,储能能力R e大2.6%;声发射累计计数及累计能量分别高48.8%、106.1%,声发射b值大14.1%;通过声发射AF-RA值分析发现,两种加载控制方式对裂纹类型的影响不显著。研究结果对于深入揭示脆性岩石破裂机制具有重要意义。The loading control mode is one of the key factors affecting the mechanical properties of rocks.In this study,two loading control modes—axial deformation control and circumferential deformation control—were used to conduct uniaxial compression tests on granite specimens at a deformation rate of 0.005 mm·s^(-1).The effects of different loading control modes on the mechanical and acoustic emission(AE)characteristics of granite were explored.The influence of these modes on peak strength,stress and strain thresholds,energy evolution,and AE characteristics of granite was analyzed.The results show that the peak strength,crack damage stress,and crack initiation stress of specimens under axial deformation control are 12.8%,15.1%,and 13.1%higher,respectively,compared to those under circumferential deformation control.The peak axial strain,axial damage strain,and crack initiation axial strain are 12.5%,14.3%,and 15.2%larger,respectively,while the peak circumferential strain and crack initiation circumferential strain are 24.2%and 16.7%smaller,respectively.The total energy is 23.9%higher,and the energy storage capacity(Re)is 2.6%greater under axial deformation control.Furthermore,the cumulative count and cumulative energy of acoustic emissions are 48.8%and 106.1%higher,respectively,and the AE b-value is 14.1%larger.Analysis of the AE AF-RA value indicates that the two loading control modes do not significantly affect the fracture type of the samples.These research findings are of great significance for further understanding the fracture mechanism of brittle rocks.

关 键 词：花岗岩 轴向变形控制 环向变形控制 应力门槛值 能量演化 声发射 

分 类 号：TU45[建筑科学—岩土工程]