(1. Department of Civil Engineering,Shanghai Jiaotong University,Shanghai 200240,China;2. Chinese Underwater Technology Institute,Shanghai Jiaotong University,Shanghai 200240,China;3. State Key Laboratory for Geomechanics and Deep Underground Engineering,China University of Mining and Technology,Xuzhou,Jiangsu 221008,China;4. Faculty of
Architecture and Civil Engineering,Huaiyin Institute of Technology,Huaian,Jiangsu 223001,China)
Abstract:The laboratory tests are made for studying characteristics of acoustic emission(AE) of granite from Linyi in Shandong province at 20℃ to 800℃ using hydraulic-pressure servo testing system MTS810 and acoustic emission instrument AE21C. The relationship between ringdown count rate of granite and time as well as the relationship between AE parameters and stress-strain curves due to uniaxial compression loading are analyzed under different temperatures. Studies have shown that ringdown count rate rises and AE activity becomes more frequent with temperature increases both in the processes of heating and loading. AE parameters are quite different at and after the high temperature,of which AE parameters after high temperature are significantly lower than that at high temperature;and internal cracks are fewer resulting in that mechanical properties at high temperature are superior to that after high temperature. Ringdown cumulative count of granite at high temperature is higher than that after high temperature;especially at 800 ℃ when there is more than a doubled difference. The high temperature causes a significant increase in energy and accelerating the energy dissipation. The granite specimens showed brittle failure such as splitting and shear failure which did not appear strong ductile failure. The strength of the rock decreases and macroscopic cracks increase due to energy dissipation and elastic energy release which eventually cause deformation and failure of granite.
GANNE P,VERVOORT A,WEVESS M. Quantification of pre-peak brittle damage:correlation between acoustic emission and observed micro-fracturing[J]. International Journal of Rock Mechanics and Mining Sciences,2007,44(5):720-729.
[3]
李庶林,尹贤刚,王泳嘉,等. 单轴受压岩石破坏全过程声发射特征研究[J]. 岩石力学与工程学报,2004,23(15):2 499-2 503.(LI Shulin,YIN Xiangang,WANG Yongjia,et al. Studies on acoustic emission characteristics of uniaxial compressive rock failure[J]. Chinese Journal of Rock Mechanics and Engineering,2004,23(15):2 499-2 503.(in Chinese))
Your browse does not support frame! " target="_blank">
[4]
武晋文,赵阳升,万志军,等. 中高温三轴应力下鲁灰花岗岩热破裂声发射特征的试验研究[J]. 岩土力学,2009,30(11):3 331-3 336. (WU Jinwen,ZHAO Yangsheng,WAN Zhijun,et al. Experimental study of acoustic emission characteristics of granite thermal cracking under middle-high temperature and triaxial stress[J]. Rock and Soil Mechanics,2009,30(11):3 331-3 336.(in Chinese))
Your browse does not support frame! " target="_blank">
[6]
姜德义,陈 结,任 松,等. 盐岩单轴应变率效应与声发射特征试验研究[J]. 岩石力学与工程学报,2012,31(2):326-335.(JIANG Deyi,CHEN Jie,REN Song,et al. Experimental study of strain rate effect and acousticemission characteristics of salt rock under uniaxial compression[J]. Chinese Journal of Rock Mechanics and Engineering,2012,31(2):326-335.(in Chinese))
[8]
张志镇,高 峰,徐小丽. 花岗岩单轴压缩的声发射特征及热力耦合模型[J]. 地下空间与工程学报,2010,6(1):70-74.(ZHANG Zhizhen,GAO Feng,XU Xiaoli. Acoustic emission characteristics and thermodynamic and thermodynamic coupling model of granite under uniaxial compression[J]. Chinese Journal of Underground Space and Engineering,2010,6(1):70-74.(in Chinese))
Your browse does not support frame! " target="_blank">
[10]
谢 强,张永兴,余贤斌. 石灰岩在单轴压缩条件下的声发射特性[J]. 重庆建筑大学学报,2002,24(1):19-24.(XIE Qiang,ZHANG Yongxing,YU Xianbin. Study on acoustic emission of limestone in uniaxial compression test[J]. Journal of Chongqing Jianzhu University,2002,24(1):19-24.(in Chinese))
Your browse does not support frame! " target="_blank">
[13]
殷正钢. 岩石破坏过程中的声发射特征及其损伤实验研究[硕士学位论文][D]. 长沙:中南大学,2005:24-40.(YIN Zhenggang. Acoustic emission characteristics and injury experimental study in the process of rock failure[M. S. Thesis][D]. Changsha:Central South University,2005:24-40.(in Chinese))
Your browse does not support frame! " target="_blank">
[14]
黄 达,黄润秋,张永兴. 粗晶大理岩单轴压缩力学特性的静态加载速率效应及能量机制实验研究[J]. 岩石力学与工程学报,2012,31(2):245-255.(HUANG Da,HUANG Runqiu,ZHANG Yongxing. Experimental investigations on static loading rate effects on mechanical properties and energy mechanism of coarse crystal grain mable under uniaxial compression[J]. Chinese Journal of Rock Mechanics and Engineering,2012,31(2):245-255.(in Chinese))
[15]
谢和平,彭瑞东,鞠 杨,等. 岩石破坏的能量分析初探[J]. 岩石力学与工程学报,2005,24(15):2 603-2 608.(XIE Heping,PENG Ruidong,JU Yang,et al. On energy analysis of rock failure[J]. Chinese Journal of Rock Mechanics and Engineering,2005,24(15):2 603-2 608.(in Chinese))
Your browse does not support frame! " target="_blank">
[1]
NOMIKOS P P,SAKKAS K M,SOFIANOS A I. Acoustic emission of Dionysos marble specimens in uniaxial compression[C]// The 12th International Congress on Rock Mechanics of the International Society for Rock Mechanics. [S.l.]:[s.n.],2011:771-775.
Your browse does not support frame! " target="_blank">
[5]
王德咏,吴 刚,葛修润. 高温作用后石灰岩受压破坏过程的声发射试验研究[J]. 上海交通大学学报,2011,45(5):743-748.(WANG Deyong,WU Gang,GE Xiurun. Acoustic emission characteristics of limestone during compression and fracture after high temperature[J]. Journal of Shanghai Jiaotong University,2011,45(5):743-748.(in Chinese))
[7]
蒋海昆,张 流,周永胜. 不同温度条件下花岗岩变形破坏及声发射时序特征[J]. 地震,2000,20(3):88-94.(JIANG Haikun,ZHANG Liu,ZHOU Yongsheng. Characteristics of AE temporal sequences in the process of deformation and failure of granite at high pressure and different temperatures[J]. Earthquakes,2000,20(3):88-94.(in Chinese))
Your browse does not support frame! " target="_blank">
[9]
裴建良,刘建锋,张 茹,等. 单轴压缩条件下花岗岩声发射事件空间分布的分维特征研究[J]. 四川大学学报:工程科学版,2010,42(6):51-55.(PEI Jianliang,LIU Jianfeng,ZHANG Ru,et al. Fractal study on spatial distribution of acoustic emission events of granite specimens under uniaxial compression[J]. Journal of Sichuan University:Engineering Science,2010,42(6):51-55.(in Chinese))
Your browse does not support frame! " target="_blank">
[11]
秦四清,李造鼎,张倬元,等. 岩石声发射技术概论[M]. 成都:西南交通大学出版社,1993:16-28.(QIN Siqing,LI Zaoding,ZHANG Zhuoyuan,et al. An introduction to acoustic emission techniques in rocks[M]. Chengdu:Southwest Jiaotong University Press,1993:16-28.(in Chinese))
Your browse does not support frame! " target="_blank">
[12]
陈有亮,邵 伟,周有成. 高温作用后花岗岩力学性能试验研究[J]. 力学季刊,2011,32(3):397-402.(CHEN Youliang,SHAO Wei,ZHOU Youcheng. Experimental study on mechanical properties of granite after high temperature[J].Chinese Quarterly of Mechanics,2011,32(3):397-402.(in Chinese))
Your browse does not support frame! " target="_blank">