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| QUANTITATIVE RESEARCH ON MORPHOLOGICAL CHARACTERISTICS OF HYSTERETIC CURVES OF
QINGHAI—TIBET FROZEN CLAY |
| LUO Fei1，2，ZHAO Shuping1，MA Wei1，JIAO Guide1，3，KONG Xiangbing1 |
(1. State Key Laboratory of Frozen Soil Engineering，Cold and Arid Regions Environmental and Engineering Research Institute，Chinese Academy of Sciences，Lanzhou，Gansu 730000，China；2. College of Urban and Rural Construction，Sichuan
Agricultural University，Dujiangyan，Sichuan 611830，China；3. School of Civil Engineering and Mechanics，
Lanzhou University，Lanzhou，Gansu 730000，China) |
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Abstract Morphological characteristics of hysteretic curves consist of closure，degree of width，degree of tilting to strain axis，intensive level and the area of the hysteretic curve. Residual strain ?p，the ratio ? of short axis length to long axis length，the gradient k of the long axis，the distance d between two center points of adjacent hysteretic curves，and the area S of the hysteretic curve are used to quantitatively measure morphological characteristics of hysteretic curves. Triaxial tests for different negative temperatures are carried out to study morphological characteristics of hysteretic curves of Qinghai—Tibet frozen clay. The test results show that：?p，?，k，d and S change little with increasing cycle numbers under the same dynamic load condition；therefore，average values of ?p，?，k，d and S are adopted to measure morphological characteristics of hysteretic curves；?p，?，d and S increase gradually，and k decreases gradually with increasing dynamic strain amplitude. In other words，closure decreases，degree of width increases，intensive level decreases，degree of tilting to strain axis increases and the area of the hysteretic curve increases with increasing dynamic strain amplitude，which indicate that residual plastic strain，viscosity，degree of microscopic damage and energy dissipation increase gradually，and stiffness decreases gradually.
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Received: 19 June 2012
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| [1] 席道瑛，刘小燕，张程远. 由宏观滞回曲线分析岩石的微细观损伤[J]. 岩石力学与工程学报，2003，22(2)：182–187.(XI Daoying，LIU Xiaoyan，ZHANG Chengyuan. Analysis of micro and meso- damage of rock by macro-hysteresis curve[J]. Chinese Journal of Rock Mechanics and Engineering，2003，22(2)：182–187.(in Chinese))
[2] 范 力，张 林. 抗震试验中多自由度结构的滞回曲线分析[J]. 工业建筑，2007，37(增)：283–286.(FAN Li，ZHANG Lin. Analysis of hysteretic curve of MDOF structures in seismic test[J]. Journal of Industrial Architecture，2007，37(Supp.)：283–286.(in Chinese))
[3] 许 江，尹光志，王 鸿，等. 不同应力水平时砂岩滞回曲线演化的实验研究[J]. 重庆建筑大学学报，2006，28(2)：40–42.(XU Jiang，YIN Guangzhi，WANG Hong，et al. Experimental research on the evolution of hysteresis curve of rock in different axial stress levels[J]. Journal of Chongqing Jianzhu University，2006，28(2)：40–42.(in Chinese))
[4] 许 江，鲜学福，王 鸿，等. 循环加、卸载条件下岩石类材料变形特性的实验研究[J]. 岩石力学与工程学报，2006，25(增1)：3 040– 3 045.(XU Jiang，XIAN Xuefu，WANG Hong，et al. Experimental study on rock deformation characteristics under cycling loading and unloading conditions[J]. Chinese Journal of Rock Mechanics and Engineering，2006，25(Supp.1)：3 040–3 045.(in Chinese))
[5] 许 江，杨秀贵，王 鸿，等. 周期性载荷作用下岩石滞回曲线的演化规律[J]. 西南交通大学学报，2005，40(6)：754–758.(XU Jiang，YANG Xiugui，WANG Hong，et al. Evolution law of hysteresis curve of rock under cyclic loading[J]. Journal of Southwest Jiaotong University，2005，40(6)：754–758.(in Chinese))
[6] 肖建清，冯夏庭，丁德馨，等. 常幅循环荷载作用下岩石的滞后及阻尼效应研究[J]. 岩石力学与工程学报，2010，29(8)：1 677–1 682. (XIAO Jianqing，FENG Xiating，DING Dexin，et al. Study of hysteresis and damping effects of rock subjected to constant amplitude cyclic loading[J]. Chinese Journal of Rock Mechanics and Engineering，2010，29(8)：1 677–1 682.(in Chinese))
[7] 张 媛，许 江，杨红伟，等. 循环荷载作用下围压对砂岩滞回环演化规律的影响[J]. 岩石力学与工程学报，2011，30(2)：320–326. (ZHANG Yuan，XU Jiang，YANG Hongwei，et al. Effect of confining pressure on evolution law of hysteresis loop of sandstone under cyclic loading[J]. Chinese Journal of Rock Mechanics and Engineering，2011，30(2)：320–326.(in Chinese))
[8] 刘建锋，谢和平，徐 进，等. 循环荷载作用下岩石阻尼特性的试验研究[J]. 岩石力学与工程学报，2008，27(4)：712–717.(LIU Jianfeng，XIE Heping，XU Jin，et al. Experimental study on damping characteristics of rock under cyclic loading[J]. Chinese Journal of Rock Mechanics and Engineering，2008，27(4)：712–717.(in Chinese))
[9] 席道瑛，王少刚，刘小燕，等. 岩石的非线性弹塑性响应[J]. 岩石力学与工程学报，2002，21(6)：772–777.(XI Daoying，WANG Shaogang，LIU Xiaoyan，et al. Nonlinear elastoplastic response of rocks[J]. Chinese Journal of Rock Mechanics and Engineering，2002，21(6)：772–777.(in Chinese))
[10] 席道瑛，刘小燕，张程远. 应力控制疲劳载荷作用下循环硬化的应变响应[J]. 岩石力学与工程学报，2003，22(11)：1 807–1 810.(XI Daoying，LIU Xiaoyan，ZHANG Chengyuan. Strain response of cyclic hardening under fatigue loading on saturated rock[J]. Chinese Journal of Rock Mechanics and Engineering，2003，22(11)：1 807–1 810.(in Chinese))
[11] 席道瑛，王春雷，田象燕. 滞回曲线对应力振幅和频率的响应[J]. 物探化探计算技术，2001，23(2)：121–123.(XI Daoying，WANG Chunlei，TIAN Xiangyan. The responses of hysteresis loops to stress mplitude and frequency[J]. Computing Techniques for Geophysical and Geochemical Exploration，2001，23(2)：121–124.(in Chinese))
[12] 陈运平，席道瑛，薛彦伟. 循环载荷下饱和岩石的应力–应变动态响应[J]. 石油地球物理勘探，2003，38(4)：409–413.(CHEN Yunping，XI Daoying，XUE Yanwei. Dynamic stress-strain response in saturated rocks under cycling load[J]. Oil Geophysical Prospecting，2003，38(4)：409–413.(in Chinese))
[13] 陈运平，王思敬. 多级循环荷载下饱和岩石的弹塑性响应[J]. 岩土力学，2010，31(4)：1 030–1 034.(CHEN Yunping，WANG Sijing. Elastoplastic response of saturated rocks subjected to multilevel cyclic loading[J]. Rock and Soil Mechanics，2010，31(4)：1 030–1 034.(in Chinese))
[14] TUTUNCU A N，PODIO A L，SHARMA M M. Nonlinear viscoelastic behavior of sedimentary rock，part II：hysteresis effects and influence of type of fluid on elastic moduli[J]. Geophysics，1998，63(1)：195–203.
[15] BRENNAN B J，STACEY F D. Frequency dependence of elasticity of rock-test of seismic velocity dispersion[J]. Nature，1977，268：220–222.
[16] MCKAVANAGH B，STACEY F D. Mechanical hysteresis in rocks at low strain amplitudes and seismic frequencies[J]. Physics of the Earth and Planetary Interiors，1974，3(8)：246–250.
[17] 胡仲有，骆亚生，李 焱. 不同地区黄土阻尼比特性试验研究[J]. 地震工程与工程振动，2010，30(2)：167–172.(HU Zhongyou，LUO Yasheng，LI Yan. Experimental study on damping ratio variation characteristics of loess in different areas[J]. Journal of Earthquake Engineering and Engineering Vibration，2010，30(2)：167–172.(in Chinese))
[18] 尚守平，刘方成，杜运兴，等. 应变累积对黏土动剪模量和阻尼比影响的试验研究[J]. 岩土力学，2006，27(5)：683–688.(SHANG Shouping，LIU Fangcheng，DU Yunxing，et al. Experimental study on effect of shear strain accumulation on dynamic shear modulus and damping ratio of clay soil[J]. Rock and Soil Mechanics，2006，27(5)：683–688.(in Chinese))
[19] 王丽霞. 冻土动力性能与冻土场地路基地震响应反应研究[博士学位论文][D]. 哈尔滨：哈尔滨工业大学，2004.(WANG Lixia. Study on frozen soil dynamic behavior and earthquake response of embankment on frozen soil site[Ph. D. Thesis][D]. Harbin：Harbin Institute of Technology，2004.(in Chinese))
[20] 中华人民共和国国家标准编写组. GB50123/T—99 土工试验方法标准[S]. 北京：中国建筑工业出版社，1999.(The National Standards Compilation Group of People?s Republic of China. GB50123/T—99 Standard for soil test method[S]. Beijing：China Architecture and Building Press，1999.(in Chinese))
[21] 中华人民共和国国家标准编写组. GB50269/T—97 地基动力特性测试规范[S]. 北京：中国建筑工业出版社，1997.(The National Standards Compilation Group of People?s Republic of China. GB50269/ T—97 Foundation dynamic properties test specification[S]. Beijing：China Architecture and Building Press，1997.(in Chinese))
[22] 张克绪. 土动力学[M]. 北京：地震出版社，1989：9–29.(ZHANG Kexu. Soil dynamics[M]. Beijing：Earthquake Press，1989：9–29.(in Chinese))
[23] 罗 飞，赵淑萍，马 巍，等. 动荷载作用下冻结兰州黄土的动应变幅变化特征研究[J]. 冰川冻土，2012，34(4)：884–890.(LUO Fei，ZHAO Shuping，MA Wei，et al. Characteristics of dynamic strain amplitude of frozen Lanzhou loess under dynamic loading[J]. Journal of Glaciology and Geocryology，2012，34(4)：884–890.(in Chinese)) |
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2013, Vol. 32 
