脆性不同岩石的声发射能量特征研究
摘要:为研究不同脆性岩石的声发射能量特征,利用4种脆性不同岩石进行常规单轴压缩试验,加载同时进行声发射信号检测,得到了应力-应变曲线和声发射能量曲线。结果表明,试样砂比越大,脆性越强;峰值之前,各试样应力-应变曲线形状相似,均无明显塑性变形段,最大的区别在于各曲线斜率不同,而声发射曲线可明显区别出塑性变形段,并且随着脆性增强,塑性段在变短;峰值处,声发射能量达到最大值,且最大值与试样脆性指数满足乘幂函数关系;峰后应力瞬间降落到底,声发射能量持续较短时间,随着脆性增强,声发射活动持续时间在缩短。
Abstract:The conventional uniaxial test for four kinds of rocks with different brittleness is carried to obtain the acoustic emission energy characteristics of rocks with different brittleness.In the process of loading,the acoustic emission(AE) signal is detected by the acoustic emission detection system.Stress-strain curves and acoustic emission energy curves are gotten from this test.The results show that the brittleness of samples increase with the increasing of the sand ratio.The stress-strain curve shapes of the samples are similar and there are no obvious plastic stages before the peak value,while the acoustic emission curves have the obvious plastic stage and the plastic stage becomes shouter as the brittleness increases.The acoustic emission energy reaches the maximum value at the peak value and the maximum value follows a power function relationship with the brittleness index of the samples.After the peak,the stress decreases at a moment,but the acoustic emission energy will last for a short time and the duration of acoustic emission activity is shortened with the increasing of sample’s brittleness.
中文标题：
脆性不同岩石的声发射能量特征研究
Study on Acoustic Emission Energy Characteristics of Rocks with Different Brittleness
作者：
马云朋,赵万春,陈艳秋
Ma Yunpeng,Zhao Wanchun,Chen Yanqiu
作者简介:马云朋,男,1991年生,汉族,河北石家庄人,在读硕士研究生。E-mail:1144627942@qq.com
通讯地址：
东北石油大学石油工程学院, 黑龙江大庆 163318
SchoolofPetroleumEngineering,NortheastPetroleumUniversity,Daqing163318,Heilongjiang,China
中图分类号:TU458
doi:10.3969/j.issn.1007-2993.2017.04.008
出版物：岩土工程技术
收稿日期:2017-03-06
网络出版日期:2021-07-06
关键词:岩石脆性,声发射能量,单轴试验,声发射,脆性指数
Key words:rock brittleness,acoustic emission energy,uniaxial test,acoustic emission,brittleness index
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基金项目：
基金项目: 国家自然科学基金项目(编号:51404073 51574088) 中国博士后科学基金特别资助项目(编号:2016T90268) 中国博士后科学基金项目(编号:2014M550180)资助
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