基于声发射试验的红层砂岩损伤演化特性分析  

Damage Evolution Analysis of Red Sandstone Based on Acoustic Emission Test

作　　者：王腾飞 李远耀 徐勇[3] 郭子正[2] 杨钦富 Wang Tengfei;Li Yuanyao;Xu Yong;Guo Zizheng;Yang Qinfu(Institute of Geological Survey,China University of Geosciences(Wuhan),Wuhan 430074,China;Faculty of Engineering,China University of Geosciences(Wuhan),Wuhan 430074,China;Wuhan Center of Geological Survey,China Geological Survey,Wuhan 430205,China;Guizhou Transportation Planning and Design Research InstituteCompany Limited,Guiyang 550081,China)

机构地区：[1]中国地质大学(武汉)地质调查研究院,武汉430074 [2]中国地质大学(武汉)工程学院,武汉430074 [3]中国地质调查局武汉地质调查中心,武汉430205 [4]贵州省交通规划勘察设计研究院股份有限公司,贵阳550081

出　　处：《地质科技情报》2019年第4期247-254,共8页Geological Science and Technology Information

基　　金：国家自然科学基金项目(41572256);中国地质调查局地质调查项目(2016290089)

摘　　要：红层砂岩在我国广泛分布,其特殊的工程地质特性对工程建设具有重要影响。对取自重庆万州龙驹坝地区的侏罗系红层砂岩样品进行了声发射试验,分析了其在单轴压缩条件下的损伤演化特性,得到了样品在单轴压缩条件下的应力-应变特征曲线,以及声发射参数在红层砂岩破裂过程中的响应特征。试验结果表明:样品在单轴受压条件下的损伤过程分为内部压密、弹性变形、塑性变形、破裂和残余变形5个阶段,各阶段声发射参数具有显著差异;不同类型样品的损伤量曲线与应力曲线具有同步性,且在弹性-塑性临界点开始出现损伤量的跳跃性增长;对AE振铃计数率参数的回归分析表明,样品在损伤破裂过程中的声发射参数序列存在分形特征,关联维数D可以较好地表征岩石内部损伤的发展规律。试验成果可为红层岩体失稳破坏的监测预警及风险评价提供数据支撑。The red sandstone is widely distributed in China,and its special engineering geological characteristics have important influence on engineering construction.The Jurassic red sandstone samples from the Longjuba area of Wanzhou,Chongqing were selected for the acoustic emission test,and their damage evolution process under uniaxial compression was analyzed.The stress-strain characteristic curves of the samples under uniaxial compression and the response characteristics of the acoustic emission parameters during the rupture of the red beds are obtained.The results show that the damage process of the samples under the uniaxial compression condition is divided into five stages:compaction,elastic deformation,plastic deformation,rupture and peak residual deformation.The acoustic emission parameters of each stage are obviously different.The damage curves of different types of samples are in consistence with the stress curve,and the jump amount of damage starts to appear at the critical point of elasticity-plasticity.Regression analysis of AE ringing counting rate parameters shows that the acoustic emission parameters of the samples have fractal characteristics in the process of damage and rupture;the correlation dimension D can characterize the development of internal damage in rock.The results of the experiment can provide data support for the monitoring,early warning and risk assessment of the failure of the red bed rock mass.

关 键 词：红层砂岩 单轴压缩 声发射试验 损伤演化 分形 

分 类 号：TU454[建筑科学—岩土工程]