双轴加载下花岗岩破裂过程声发射b值特征研究
投稿时间:2018-03-03  修订日期:2019-09-16  点此下载全文
引用本文:
摘要点击次数: 147
全文下载次数: 0
作者单位E-mail
徐世达 东北大学深部金属矿山安全开采教育部重点试验室 xushida@mail.neu.edu.cn 
李元辉 东北大学深部金属矿山安全开采教育部重点试验室  
刘建坡 东北大学深部金属矿山安全开采教育部重点试验室  
杜万 东北大学深部金属矿山安全开采教育部重点试验室  
基金项目:中国博士后科学基金,
中文摘要:基于声发射定位技术和声发射事件震级算法,对在双轴加载条件下岩石破裂声发射b值变化规律进行试验研究。研究结果表明:双轴加载试验中,岩样声发射b值变化规律与单轴加载b值变化规律相似,先随应力增大而增大,之后随应力增大而减小;侧向压力的变化对声发射b值均值的大小影响不明显,但对加载过程中b值的波动范围有明显影响;随着侧向压力的增大,声发射b值峰值出现在较低应力区间,与单轴加载试样破坏前才出现b值下降规律不同,双轴加载岩石的b值变化规律应充分考虑侧向压力的影响,这对应用b值预报双轴加载条件下岩石的破坏具有重要意义。
中文关键词:双轴加载  b值  声发射  侧向压力  破裂过程
 
Study on the characteristics of b value during granite failure process under biaxial loading
Abstract:Based on the acoustic emission(AE) locating technology and Magnitude algorithm, the experiment study of fracture mechanism and time and space distribution characteristics of the change of b value for granite rock acoustic emission under biaxial compression is conducted. The results show that,the change rule of b value in the biaxial experiment is similar to that in the uniaxial experiment, which increases firstly, then decreases with the stress increasing. The increasing of lateral stress, which affects the range of b value apparently, is not enough to affect the average of b value. With the increasing of the lateral stress, the peak of b value appears in lower stress range, which is different from the rule that the b value only declines pre-failure damage. The results are significant for the application of b value to forecast the rock failure.
keywords:biaxial  loading, b-value, AE, lateral  pressure, failure  process
  查看/发表评论  下载PDF阅读器
设备展厅
您是第5599846位访问者  备案许可证编号:京ICP备13036454号
版权所有:《中国矿业》杂志社有限公司
地  址: 北京市朝阳区安定门外小关东里10号院东小楼 邮编:100029 电话:010-68332570 88374940 E-mail: zgkyzzs@163.com