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| Failure mechanisms and precursory characteristics of deep buried granite in a tunnel in Southwest China |
| CHEN Bingrui1，2，WEI Fanbo1，2，WANG Rui3，LI Tao1，2，ZHU Xinhao1，2，WANG Xu1，2 |
(1. State Key Laboratory of Geomechanics and Geotechnical Engineering，Institute of Rock and Soil Mechanics，Chinese Academy of Sciences，Wuhan，Hubei 430071，China；2. University of Chinese Academy of Sciences，Beijing 100049，China；
3. Sichuan-Tibet Railway Co.，Ltd.，Nyingchi，Tibet 850400，China) |
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Abstract 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)(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.
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[1]赵军，袁国庆，唐世明. 双江口水电站地应力特征及岩爆成因分析与防治建议[J]. 四川地质学报，2010，30(4)：500–503.(ZHAO Jun，YUAN Guoqing，TANG Shiming. In-situ stress characteristics of Shuangjiangkou Hydropower Station and analysis of rockburst genesis and prevention suggestions[J]. Acta Geologica Sichuan，2010，30(4)：500–503.(in Chinese))
[2]吴耀宗，陶双江，罗雪涛，等. 米仓山特长深埋隧道地应力测量及分析[J]. 西南公路，2016，(4)：88–91.(WU Yaozong，TAO Shuangjiang，LUO Xuetao，et al. In-situ stress measurement and analysis of Micangshan extra long deep buried tunnel[J]. Southwest Highway，2016，(4)：88–91.(in Chinese))
[3]冯夏庭，肖亚勋，丰光亮，等. 岩爆孕育过程研究[J]. 岩石力学与工程学报，2019，38(4)：649–673.(FENGXiating，Xiao Yaxun，FENG Guangliang，et al. Study on the development process of rockbursts[J]. Chinese Journal of Rock Mechanics and Engineering，2019，38(4)：649–673.(in Chinese))
[4]冯夏庭，陈炳瑞，明华军，等. 深埋隧洞岩爆孕育规律与机制：即时型岩爆[J]. 岩石力学与工程学报，2012，31(3)：433–444. (FENG Xiating，CHEN Bingrui，MING Huajun，et al. Evolution law and mechanism of rockbursts in deep tunnels：immediate rockburst[J]. Chinese Journal of Rock Mechanics and Engineering，2012，31(3)：433–444.(in Chinese))
[5]陈炳瑞，冯夏庭，明华军，等. 深埋隧洞岩爆孕育规律与机制：时滞型岩爆[J]. 岩石力学与工程学报，2012，31(3)：561–569. (CHEN Bingrui，FENG Xiating，Ming Huajun，et al. Evolution law and mechanism of rockbursts in deep tunnels：time delayed rockburst[J]. Chinese Journal of Rock Mechanics and Engineering，2012，31(3)：561–569.(in Chinese))
[6]冯涛，谢学斌，潘长良，等. 岩爆岩石断裂机制的电镜分析[J]. 中南工业大学学报：自然科学版，1999，30(1)：14–17.(FENG Tao，XIE Xuebin，PAN Changliang，et al. Electron microscopic analysis of failure mechanism of rockburst[J]. Journal of Central South University of Technology：Natural Science，1999，30(1)：14–17.(in Chinese))
[7]范 勇，卢文波，王义昌，等.不同开挖方式下即时型和时滞型岩爆的孕育特征比较[J]. 岩石力学与工程学报，2015，34(增2)：3 715–3 723.(FAN Yong，LU Wenbo，WANG Yichang，et al. Comparison of evolution characteristics of immediate and time delayed rockbursts under different excavation methods[J]. Chinese Journal of Rock Mechanics and Engineering，2015，34(Supp.2)：3 715–3 723.(in Chinese))
[8]阳友奎，肖长富，吴刚，等. 不同地应力状态下水力压裂的破坏模式[J]. 重庆大学学报：自然科学版，1993，16(3)：30–35.(YANG Youkui，XIAO Changfu，WU Gang，et al. Hydrofracturing breakdown modes under different in-situ stress states[J]. Journal of Chongqing University：Natural Science，1993，16(3)：30–35.(in Chinese))
[9]曹安业，窦林名，江衡，等. 采动煤岩不同破坏模式下的能量辐射与应力降特征[J]. 采矿与安全工程学报，2011，28(3)：350–355.(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[J]. Journal of Mining and Safety Engineering，2011，28(3)：350–355.(in Chinese))
[10]傅宇方，梁正召，唐春安. 岩石介质细观非均匀性对宏观破坏过程的影响[J]. 岩土工程学报，2000，22(6)：705–710.(FU Yufang，LIANG Zhengzhao，TANG Chunan. Numerical simulation on influence of mesoscopic heterogeneity on macroscopic behavior of rock failure[J]. Chinese Journal of Geotechnical Engineering，2000，22(6)：705–710.(in Chinese))
[11]刘庭金，唐春安. 软硬接触对含包体试样破坏模式影响的数值试验[J]. 地震研究，2002，(1)：53–57.(LIU Tingjin，TANG Chunan. Numerical test on influence of weak and hard touching on failure model of specimen within clusion[J]. Journal of Seismological Research，2002，(1)：53–57.(in Chinese))
[12]朱万成，唐春安，黄志平，等. 静态和动态载荷作用下岩石劈裂破坏模式的数值模拟[J]. 岩石力学与工程学报，2005，24(1)：1–7.(ZHU Wancheng，TANG Chunan，HUANG Zhiping，et al. Numerical simulation on splitting failure mode of rock under static and dynamic loadings[J]. Chinese Journal of Rock Mechanics and Engineering，2005，24(1)：1–7.(in Chinese))
[13]AGGELIS D G，SOULIOTI D V，SAPOURIDIS N，et al. Acoustic emission characterization of the failure process in fibre reinforced concrete[J]. Construction and Building Materials，2011，25(11)：4126–4131.
[14]YUYAMA S，OKAMOTO T，SHIGEISHI，et al. Quantitative evaluation and visualization of cracking process in reinforced concrete specimens by means of moment tensor analysis[J]. Journal of JSNDI ，1994，43(8)：514.
[15]SHIOTANI T，OHTSU M，IKEDA K. Detection and evaluation of AE waves due to rock deformation[J]. Construction and Building Materials，2001，15(5)：235–246.
[16]ZHANG J Z，ZHOU X P，ZHOU L S，et al. Progressive failure of brittle rocks with non-isometric flaws：Insights from acousto-optic-mechanical(AOM) data[J]. Fatigue and Failure of Engineering Materials and Structures，2019，42(8)：1787–1802.
[17]刘希灵，刘周，李夕兵，等. 单轴压缩与劈裂荷载下灰岩声发射b值特性研究[J]. 岩土力学，2019，40(增1)：267–274.(LIU Xi-ling，LIU Zhou，LI Xibing，et al. Acoustic emission b-values of limestone under uniaxial compression and Brazilian splitting loads[J]. Rock and Soil Mechanics，2019，40(Supp.1)：267–274.(in Chinese))
[18]沈功田，耿荣生，刘时风. 声发射源定位技术[J]. 无损检测，2002，(3)：114–117.(SHEN Gongtian，GENG Rongsheng，LIU Shifeng. Acoustic emission source location[J]. Nondestructive Testing，2002，(3)：114–117.(in Chinese))
[19]李育枢，郑建国，李天斌. 电站隧洞岩爆岩石的微观破坏力学机制分析[J]. 水力发电，2006，(8)：17–20.(LI Yushu，ZHENG Jianguo，LI Tianbin. The microcosmic failure mechanism analysis of rock burst area in the tunnel of a hydroelectric power station[J]. Water Power，2006，(8)：17–20.(in Chinese))
[20]TRIANTIS D，KOURKOULIS S K. An alternative approach for representing the data provided by the acoustic emission technique[J]. Rock Mechanics and Rock Engineering，2018，51(8)：2 433–2 438.
[21]MORADIAN Z，EINSTEIN H H，BALLIVY G. Detection of cracking levels in brittle rocks by parametric analysis of the acoustic emission signals[J]. Rock Mechanics and Rock Engineering，2016，49(3)：785–800.
[22]ZHOU X P，ZHANG J Z，QIAN Q H，et al. Experimental investigation of progressive cracking processes in granite under uniaxial loading using digital imaging and AE techniques[J]. Journal of Structural Geology，2019，126：129–145.
[23]LI L R，DENG J H，ZHENG L，et al. Dominant frequency characteristics of acoustic emissions in white marble during direct tensile tests[J]. Rock Mechanics and Rock Engineering，2017，50(5)：1337–1346.
[24]张艳博，梁鹏，孙林，等. 单轴压缩下饱水花岗岩破坏过程声发射频谱特征试验研究[J]. 岩土力学，2019，40(7)：2 497–2 506. (ZHANG Yanbo，LIANGPeng，SUNLin，et al. Spectral characteristics of AE in the process of saturated granite failure under uniaxial compression[J]. Rock and Soil Mechanics，2019，40(7)：2 497–2 506.(in Chinese)) |
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2020, Vol. 39 
