Failure mechanisms and precursory characteristics of deep buried granite in a tunnel in Southwest China

被引：0
|
作者：
Chen B. [1 ,2 ]
Wei F. [1 ,2 ]
Wang R. [3 ]
Li T. [1 ,2 ]
Zhu X. [1 ,2 ]
Wang X. [1 ,2 ]
机构：
[1] State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, 430071, Hubei
[2] University of Chinese Academy of Sciences, Beijing
[3] Sichuan-Tibet Railway Co., Ltd., Nyingchi, 850400, Tibet
来源：
Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | 2020年 / 39卷 / 03期
基金：
中国国家自然科学基金;
关键词：
Acoustic emission; Deep buried granite; Failure mechanism; Failure mode; Precursory characteristics; Rock mechanics;
D O I：
10.13722/j.cnki.jrme.2019.1151
中图分类号：
学科分类号：
摘要：
In this study, a uniaxial compression with acoustic emission, elastic wave velocity and SEM scanning test was conducted to study the failure mode, mechanism and precursory characteristics of deep buried granite in Southwest China. It is found that the granite in the tunnel has obvious “time-delayed type” and “immediate type” failure characteristics and the “time-delayed type” failure also has obvious “intermittent”characteristics. The sound, phenomenon, incubation time and duration of “time-delayed type”failure are obviously different from those of “immediate type”failure. The “time-delayed type”is dominated by shear failure, while the “immediate type”is dominated by tension-shear mixed failure. Before failure, lg(AF/RA)(AF/RA is characteristic parameters of acoustic emission that can represent failure types) of the “time-delayed type”increases obviously, while the change of the “immediate type” is not obvious. The wave velocity of the two types before failure decreases obviously, but compared to the “immediate type”, the precursor of the “time-delayed type” failure appears earlier and the amplitude of the decrease is larger. Besides, the main frequency bandwidth of the”time-delayed type” is larger while the mean value of main frequency of the”time-delayed type” is lower. Before the “time-delayed type” failure, the dominant frequency distribution between the bands of 170-260 kHz is strengthened with a trend of “nucleation”, but the precursory feature of “immediate type” failure is not obvious. The research results are of great significance to the recognition of occurrence mechanism, early warning and prevention of granite rockburst in Southwest China. © 2020, Science Press. All right reserved.
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页码：469 / 479
页数：10
相关论文
共 24 条
  • [1] ZHAO Jun, YUAN Guoqing, TANG Shiming, In-situ stress characteristics of Shuangjiangkou Hydropower Station and analysis of rockburst genesis and prevention suggestions, Acta Geologica Sichuan, 30, 4, pp. 500-503, (2010)
  • [2] WU Yaozong, TAO Shuangjiang, LUO Xuetao, Et al., In-situ stress measurement and analysis of Micangshan extra long deep buried tunnel, Southwest Highway, 4, pp. 88-91, (2016)
  • [3] FENG Xiating, Xiao Yaxun, FENG Guangliang, Et al., Study on the development process of rockbursts, Chinese Journal of Rock Mechanics and Engineering, 38, 4, pp. 649-673, (2019)
  • [4] FENG Xiating, CHEN Bingrui, MING Huajun, Et al., Evolution law and mechanism of rockbursts in deep tunnels: immediate rockburst, Chinese Journal of Rock Mechanics and Engineering, 31, 3, pp. 433-444, (2012)
  • [5] CHEN Bingrui, FENG Xiating, MING Huajun, Et al., Evolution law and mechanism of rockbursts in deep tunnels: time delayed rockburst, Chinese Journal of Rock Mechanics and Engineering, 31, 3, pp. 561-569, (2012)
  • [6] FENG Tao, XIE Xuebin, PAN Changliang, Et al., Electron microscopic analysis of failure mechanism of rockburst, Journal of Central South University of Technology: Natural Science, 30, 1, pp. 14-17, (1999)
  • [7] FAN Yong, LU Wenbo, WANG Yichang, Et al., Comparison of evolution characteristics of immediate and time delayed rockbursts under different excavation methods, Chinese Journal of Rock Mechanics and Engineering, 34, pp. 3715-3723, (2015)
  • [8] YANG Youkui, XIAO Changfu, WU Gang, Et al., Hydrofracturing breakdown modes under different in-situ stress states, Journal of Chongqing University: Natural Science, 16, 3, pp. 30-35, (1993)
  • [9] CAO Anye, DOU Linming, JIANG Heng, Et al., Characteristics of energy radiation and stress drop in different failure modes of mining-induced coal-rock mass, Journal of Mining and Safety Engineering, 28, 3, pp. 350-355, (2011)
  • [10] FU Yufang, LIANG Zhengzhao, TANG Chun'an, Numerical simulation on influence of mesoscopic heterogeneity on macroscopic behavior of rock failure, Chinese Journal of Geotechnical Engineering, 22, 6, pp. 705-710, (2000)
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