声发射和变形场联合监测试验研究
投稿时间:2019-12-31  修订日期:2020-01-06  点此下载全文
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作者单位E-mail
王晓雷 华北理工大学矿业工程学院 32289873@qq.com 
蒋鹏程 华北理工大学矿业工程学院 373501836@qq.com 
闫顺玺 华北理工大学矿业工程学院  
詹思博 华北理工大学矿业工程学院  
皇甫润 华北理工大学矿业工程学院  
王尚政 华北理工大学以升创新教育基地  
基金项目:深井热害防治与矿井热能利用
中文摘要:为探究工程岩体在声发射和变形场联合监测下破裂失稳的特征,分析两者与岩石破裂失稳的内在联系,进行了片麻岩单轴压缩试验,提供一种更全面的预警方法。研究结果如下:声发射累计振铃计数和变形场应变均方差两个参数曲线启动点出现时间差距不大,预警点出现时间差距较大,总体上声发射比变形场更早监测到破裂信息;声发射累计振铃计数曲线和应变均方差曲线第一次以近竖直斜率大幅上升时即可预警,代表岩石即将破坏。声发射累计振铃计数曲线上升幅度占总体20%-50%,平均占比34.65%,应变均方差曲线上升幅度占总体25%-65%,平均占比41.15%;岩石破裂失稳预警,在时间上声发射比变形场更早观测到,在空间上变形场可实时观测岩石表面裂纹演化情况。将两种监测手段联合,能更全面了解工程岩体破裂情况,为实际工程岩体的稳定性控制及防治提供理论依据。
中文关键词:声发射  变形场  联合监测  预警
 
Experimental study on combined acoustic emission and deformation field monitoring
Abstract:The purpose of this paper is to explore the characteristics of fracture instability of engineering rock mass under combined acoustic emission and deformation field monitoring and analyze the internal relationship between them and rock fracture instability.In this paper, the uniaxial compression test of gneiss is carried out to provide a more comprehensive method for early warning.The results are as follows: there is little time difference between the start points of the acoustic emission cumulative ringing count and the strain mean square deviation of the deformation field, while there is a big time difference between the warning points. On the whole, the acoustic emission detects the rupture information earlier than the deformation field.The cumulative acoustic emission ringing count curve and strain mean square deviation curve can give warning when the near vertical slope rises sharply for the first time, indicating that the rock is about to collapse.The cumulative acoustic emission ringing count curve increased by 20%-50%, accounting for 34.65% on average, and the strain mean square deviation curve increased by 25%-65%, accounting for 41.15% on average.In terms of the early warning of rock fracture and instability, the temporal acoustic emission is earlier than the deformation field, but the deformation field can be used to observe the rock surface crack evolution in real time.By combining the two monitoring methods, the rupture of engineering rock mass can be understood more comprehensively, and the theoretical basis for stability control and prevention of engineering rock mass can be provided.
keywords:Acoustic emission  The deformation field  Joint monitoring  warning
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