###
DOI:
有色金属(矿山部分):2020,72(4):63-69
←前一篇   |   后一篇→
本文二维码信息
码上扫一扫!
白云岩的单轴压缩力学特性及声发射特性研究
刘汉香, 别鹏飞, 邓叶林, 李欣, 张群
(1.成都理工大学;2.四川省国土空间生态修复与地质灾害防治院)
Research on mechanical properties and acoustic emission characteristics under uniaxial compression test of dolomite
LIU Hanxiang,BIE Pengfei,DENG Yelin,LI Xin,ZHANG Qun
(Chengdu University of Technology)
摘要
图/表
参考文献
相似文献
本文已被:浏览 142次   下载 156
投稿时间:2020-01-15    修订日期:2020-01-29
中文摘要: 摘 要:对从青川县东河口滑坡区采集的白云岩进行了单轴压缩试验,测得了白云岩的单轴抗压强度、弹性模量等力学参数,并在单轴压缩试验的全过程运用了声发射测试技术,研究了岩石损伤破坏过程中的声发射参数(振铃计数、能量)演化规律及其与岩石的应力响应之间的相关性,并尝试对岩石损伤破坏前兆的声发射特征点进行了分析。研究结果体现了白云岩的初始缺陷对其力学特性及声发射特性会产生较大的影响。分析表明:①白云岩的变形破坏过程大致可分为五个阶段,且不同阶段出现了与之相对应的声发射信号特征;②白云岩的声发射振铃计数和能量在反映岩石损伤演化过程方面有较高的一致性。明显的声发射活动主要出现在岩石加载的中后期,在岩石进入裂纹非稳定扩展阶段后出现振铃计数和能量激增的现象,在临近破坏阶段,个别岩样进入声发射活动的相对平静期;③对比声发射特征点和应力屈服点出现的时刻,两者的差值与岩样的初始缺陷密切相关。但无论是累计振铃计数还是累计能量,基于两者识别出的特征点时间都是超前于或接近应力屈服点出现的时刻。基于本次研究结果,如果作为岩石破坏前兆信息识别,选用累计能量参数会使得安全储备更充足。
Abstract:Abstract: Based on the uniaxial compression test on dolomite rock samples from the Donghekou landslide area in Qingchuan County, Sichuan, China, the compressive strength and elasticity modulus of dolomite were obtained. At the same time, the acoustic emission testing technology was used during the compression process to study the relationship between the acoustic emission (AE) parameter (i.e. ringing count, energy) and stress response of dolomite. An attempt was made to analyze the AE feature indicating the rock damage precursor. The results show that the initial defects of dolomite have great influence on its mechanical properties and AE characteristics. The analysis shows that: ① the deformation and failure process of dolomite can be basically divided into five stages, and there are corresponding AE signal characteristics in different stages; ②the AE ringing count and energy of the dolomite have a high consistency in reflecting the damage evolution process of the rock. Obvious AE activities mainly occur in the middle and late stage of rock loading, and the ringing count and energy sharply increase when the rock enters the unstable crack growth stage. In the near failure stage, some rock samples enter the relative quiet period of AE activities; ③ comparing the moments when AE characteristic point and stress yield point occur in a rock sample, the difference between them is closely related to the initial defect of rock sample. However, whether it is the cumulative ringing count or the cumulative energy, the AE characteristic point identified based on both of them occurs earlier than or close to the stress yield point. According to the present study, it seems that the safety reserve will be more sufficient if the cumulative energy parameter is chosen as the precursor of rock damage.
文章编号:     中图分类号:    文献标志码:
基金项目:国家自然科学基金青年基金(41702316);地质灾害防治与地质环境保护国家重点实验室自主研究课题(SKLGP2018Z015);中国国家重点研发项目(2018YFC1505205)
引用文本:
刘汉香,别鹏飞,邓叶林,李欣,张群.白云岩的单轴压缩力学特性及声发射特性研究[J].有色金属(矿山部分),2020,72(4):63-69.
LIU Hanxiang,BIE Pengfei,DENG Yelin,LI Xin,ZHANG Qun.Research on mechanical properties and acoustic emission characteristics under uniaxial compression test of dolomite[J].NONFERROUS METALS(Mining Section),2020,72(4):63-69.

我们一直在努力打
造,精品期刊,传
播学术成果

全国咨询服务热线
86-10-63299757

杂志信息

期刊简介

相关下载

联系我们

电话:010-63299757

传真:010-63299754

QQ:XXXXXXX

Email:ysks@bgrimm.com

邮编:100160

地址:北京市南四环西路188号总部基地十八区23号楼

关注微信公众号