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| RESEARCH ON IMPACTING FAILURE BEHAVIOR AND FLUCTUATION CHARACTERISTICS OF GRANITE EXPOSED TO HIGH TEMPERATURE |
| ZHI Lepeng1，XU Jinyu1，2，LIU Zhiqun1，LIU Shi1，CHEN Tengfei1 |
| (1. Engineering Institute，Air Force Engineering University of PLA，Xi?an，Shaanxi 710038，China；2. College of Mechanics and Civil Architecture，Northwestern Polytechnical University，Xi?an，Shaanxi 710072，China) |
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Abstract The behavior impacting failure and dynamic mechanical properties of granite exposed to high temperature have been researched with high-temperature split Hopskinson pressure bar(SHPB) system and ultrasonic detector SRM–5N. The scope of this research includes the variation of longitudinal wave velocity，waveform，dynamic compressive strength and peak stress with the temperature. The temperature varies in the range of 25 ℃，100 ℃，200 ℃，400 ℃，600 ℃，800 ℃，1 000 ℃，and the heating velocity is 10 ℃/min. The results are as follow：(1) Generally speaking，the thermal damage of granite gradually raises with the temperature increasing. But it decreases before 100 ℃，Then enhancement of thermal damage is not drop slowly until exposed to 600 ℃. (2) As a whole，the dynamic compressive strength of granite is diminution and peak strain is enlarge when the temperature is enhanced，but it is opposition with them before 110 ℃. And dynamic compressive strength is obviously reductive and peak strain is obviously enhancive after 600 ℃. (3) It is suggested that 110 ℃ is a temperature threshold of granite，before this temperature，the thermal damage of granite is minus，the dynamic compressive strength decreases. And suggested another temperature threshold is 600 ℃– 800 ℃，the dynamic mechanical properties of granite changed obviously beyond this temperature. The research method and conclusions can provide references for rock project construction and fireproofing designs.
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Received: 10 May 2012
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| [1] 黄 达，金华辉，黄润秋. 拉剪应力状态下岩石裂隙扩展的断裂力学机制及物理模型试验[J]. 岩土力学，2011，32(4)：997–1 002. (HUANG Da，JIN Huahui，HUANG Runqiu. Mechanism of fracture mechanics and physical model test of rocks crack expanding under tension-shear stress[J]. Rock and Soil Mechanics，2011，32(4)：997– 1 002.(in Chinese))
[2] 赵明阶，吴德伦. 单轴受荷条件下岩石的声学特性模型与试验研究[J]. 岩土工程学报，1999，21(5)：540–545.(ZHAO Mingjie，WU Delun. Experimental study on the ultrasonic characteristics of rock under uniaxial loading[J]. Chinese Journal of Geotechnical Engineering，1999，21(5)：540–545.(in Chinese))
[3] 中国机械工程学会无损检测分会. 超声波检测[M]. 北京：机械工业出版社，2000：40–42.(Chinese Mechanical Engineering Society for Non-destructive Testing. Ultrasonic testing[M]. Beijing：China Machine Press，2000：40–42.(in Chinese))
[4] 李海波，赵 坚，李俊如，等. 三轴情况下花岗岩动态力学特性的试验研究[J]. 爆炸与冲击，2004，24(5)：470–475.(LI Haibo，ZHAO Jian，LI Junru，et al. Triaxial compression tests of a granite[J]. Explosion and Shock Waves，2004，24(5)：470–475.(in Chinese))
[5] 李夕兵，周子龙，叶州元，等. 岩石动静组合加载力学特性研究[J]. 岩石力学与工程学报，2008，27(7)：1 387–1 395.(LI Xibing，ZHOU Zilong，YE Zhouyuan，et al. Study of rock mechanical characteristics under coupled static and dynamic loads[J]. Chinese Journal of Rock Mechanics and Engineering，2008，27(7)：1 387–1 395.(in Chinese))
[6] 万志军，赵阳升，董付科，等. 高温及三轴应力下花岗岩体力学特性的试验研究[J]. 岩石力学与工程学报，2008，27(1)：72–77.(WAN Zhijun，ZHAO Yangsheng，DONG Fuke，et al. Experimental study on mechanical characteristics of granite under high temperature and triaxial stresses[J]. Chinese Journal of Rock Mechanics and Engineering，2008，27(1)：72–77.(in Chinese))
[7] 许锡昌，刘泉声. 高温下花岗岩基本力学性能初步研究[J]. 岩土工程学报，2000，22(3)：332–335.(XU Xichang，LIU Quansheng. A preliminary study on basic mechanical properties for granite at high temperature[J]. Chinese Journal of Geotechnical Engineering，2000，22(3)：332–335.(in Chinese))
[8] 苏承东，郭文兵，李小双. 粗砂岩高温作用后力学效应的试验研究[J]. 岩石力学与工程学报，2008，27(6)：1 162–1 170.(SU Chengdong，GUO Wenbing，LI Xiaoshuang. Experiment research on mechanical properties of coarse sandstone after high temperatures[J]. Chinese Journal of Rock Mechanics and Engineering，2008，27(6)：1 162–1 170. (in Chinese))
[9] 李为民，许金余. 大直径分离式霍普金森压杆试验中的波形整形技术研究[J]. 兵工学报，2009，30(3)：350–355.(LI Weimin，XU Jinyu. Pulse shaping techniques for large-diameter split Hopkinson pressure bar test[J]. Acta Armamentarii，2009，30(3)：350–355.(in Chinese))
[10] 郤保平，赵阳升. 600 ℃内高温状态花岗岩遇水冷却后力学特性试验研究[J]. 岩石力学与工程学报，2010，29(5)：892–899.(XI Baoping，ZHAO Yangsheng. Experimental research on mechanical properties of tercooled granite under high temperatures within 600 ℃[J]. Chinese Journal of Rock Mechanics and Engineering，2010，29(5)：892–899.(in Chinese))
[11] 赵洪宝，尹光志，谌伦建. 温度对砂岩损伤影响试验研究[J]. 岩石力学与工程学报，2009，28(增1)：2 784–2 790.(ZHAO Hongbao，YIN Guangzhi，CHEN Lunjian. Experimental study on effect of temperature on sandstone damage[J]. Chinese Journal of Rock Mechanics and Engineering，2009，28(Supp.1)：2 784–2 790.(in Chinese))
[12] 徐小丽，高 峰，高亚楠，等. 高温后花岗岩力学性质变化及结构效应研究[J]. 中国矿业大学学报，2008，37(3)：402–406.(XU Xiaoli，GAO Feng，GAO Ya?nan，et al. Effect of high temperatures on the mechanical characteristics and crystal structure of granite[J]. Journal of China University of Mining and Technology，2008，37(3)：402–406.(in Chinese))
[13] 谭 启，骆 循，李仕雄，等. 岩石热破裂研究进展评述[J]. 露天采矿技术，2006，(6)：16–20.(TAN Qi，LUO Xun，LI Shixiong，et al. Comments on rock thermal fracturing study progress[J]. Opencast Mining Technology，2006，(6)：16–20.(in Chinese))
[14] 寇绍全. 热开裂损伤对花岗岩变形及破坏特性的影响[J]. 力学学报，1987，19(6)：550–556.(KOU Shaoquan. Effect of thermal cracking damage on the deformation and failure of granite[J]. Chinese Journal of Theoretical and Applied Mechanics，1987，19(6)：550–556.(in Chinese))
[15] 范飞林，许金余，李志武，等. 高温下混凝土动态力学特性试验[J]. 材料热处理学报，2012，(3)：32–38.(FAN Feilin，XU Jinyu，LI Zhiwu，et al. Experimental study on dynamic compressive mechanical properties of concrete exposed to high temperature[J]. Transactions of Materials and Heat Treatment，2012，(3)：32–38.(in Chinese))
[16] 李为民，许金余，翟 毅，等. 冲击荷载作用下碳纤维混凝土的力学性能[J]. 土木工程学报，2009，42(2)：24–30.(LI Weimin，XU Jinyu，ZHAI Yi，et al. Mechanical properties of carbon fiber reinforced concrete under impact loading[J]. China Civil Engineering Journal，2009，42(2)：24–30.(in Chinese) |
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2013, Vol. 32 
