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| STUDY OF CREEP PARAMETERS OF MICA-QUARTZOSE SCHIST DURING TRIAXIAL CREEP TEST |
| CHEN Wenling1，2，3，ZHAO Fasuo1，2，3，GONG Hujun4 |
| (1. College of Geology Engineering and Geomatics，Chang?an University，Xi?an，Shaanxi 710054，China；2. Key Laboratory of Western China′s Mineral Resource and Geological Engineering of Ministry of Education，Chang?an University，Xi?an，Shaanxi 710054；3. Open Research Laboratory of Geotechnical Engineering of Ministry of Land Resource，Xi?an，Shaanxi 710054；4. State Key Laboratory of Continental Dynamics，Northwest University，Xi?an，Shaanxi 710069，China) |
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Abstract The variation law for the creep parameters of mica-quartzose schist—elastic modulus and viscosity coefficient during triaxial creep process is obtained by the triaxial creep test. The elastic modulus has different variation laws before and after the yield stress，the relation between viscosity coefficient and time has three types at different stress level. By scanning electron microscope test，the micro-structural changes in major components in mica-quartzose schist during triaxial creep process are derived from observing the radial and axial slices of mica-quartzose schist which made from three creep stages，respectively，and the three stages are no force stage，the upcoming accelerated creep stage and creep damage stage. On this basis，a reasonable micro-scopic interpretation for variation in creep parameters during triaxial creep process is given. The study shows that variation in creep parameters during triaxial creep test for mica-quartzose schist has a good correspondence with the micro-structural changes，the macro variation in creep parameters is an external behavior of internal micro-structural changes of mica-quartzose schist. The function reflecting the actual law of creep parameters variation is established，and then the creep model is derived，which can be an approach to describe the upcoming accelerated creep stage of rocks.
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Received: 28 January 2010
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| [1] 王来贵，何 峰，刘向峰，等. 岩石试样非线性蠕变模型及其稳定性分析[J]. 岩石力学与工程学报，2004，23(10)：1 640–1 642. (WANG Laigui，HE Feng，LIU Xiangfeng，et al. Nonlinear creep model and stability analysis of rock[J]. Chinese Journal of Rock Mechanics and Engineering，2004，23(10)：1 640–1 642. (in Chinese))
[2] 曹树刚，边 金，李 鹏. 岩石蠕变本构关系及改进的西原正夫模型[J]. 岩石力学与工程学报，2002，21(5)：632–634.(CAO Shugang，BIAN Jin，LI Peng. Rheological constitutive relationship of rocks and a modified model[J]. Chinese Journal of Rock Mechanics and Engineering，2002，21(5)：632–634.(in Chinese))
[3] 蒋昱州，张明鸣，李良权. 岩石非线性黏弹塑性蠕变模型研究及其参数识别[J]. 岩石力学与工程学报，2008，27(4)：832–839. (JIANG Yuzhou，ZHANG Mingming，LI Liangquan. Study on nonlinear viscoelasto-plastic creep model of rock and its parameter identification[J]. Chinese Journal of Rock Mechanics and Engineering，2008，27(4)：832–839.(in Chinese))
[4] 邓荣贵，周德培，张倬元，等. 一种新的岩石流变模型[J]. 岩石力学与工程学报，2001，20(6)：780–784.(DENG Ronggui，ZHOU Depei，ZHANG Zhuoyuan，et al. A new rheological model for rocks[J]. Chinese Journal of Rock Mechanics and Engineering，2001，20(6)：780–784.(in Chinese))
[5] 韦立德，徐卫亚，朱珍德，等. 岩石黏弹塑性模型的研究[J]. 岩土力学，2002，23(5)：583–586.(WEI Lide，XU Weiya，ZHU Zhende，et al. Study on constitutive model of viscoelasto-plastic rock[J]. Rock and Soil Mechanics，2002，23(5)：583–586.(in Chinese))
[6] 杨圣奇，徐卫亚，杨松林. 龙滩水电站泥板岩剪切流变力学特性研究[J]. 岩土力学，2007，28(5)：895–902.(YANG Shengqi，XU Weiya，YANG Songlin. Investigation on shear rheological mechanical properties of shale in Longtan hydropower project[J]. Rock and Soil Mechanics，2007，28(5)：895–902.(in Chinese))
[7] 丁志坤，吕爱钟. 岩石黏弹性非定常蠕变方程的参数辨识[J]. 岩土力学，2004，25(增1)：37–40.(DING Zhikun，LU Aizhong. Parameter identification of non-stationary creep equation of rocks[J]. Rock and Soil Mechanics，2004，25(Supp.1)：37–40.(in Chinese))
[8] WANG G J. A new constitutive creep-damage model for salt rock and its characteristics[J]. International Journal of Rock Mechanics and Mining Sciences，2004，41(Supp.1)：1–7.
[9] HOXHA D，GIRAUD A，HOMAND F. Modelling long-term behaviour of a natural gypsum rock[J]. Mechanics of Materials，2005，37(12)：1 223–1 241.
[10] CHEN F，LI Y P，YANG C H. Experimental study on creep behaviors of rock salt in Yunying salt mine[J]. Chinese Journal of Rock Mechanics and Engineering，2006，25(1)：3 022–3 027.
[11] CHALLAMEL N，LANOS C，CASANDJIAN C. Creep damage modelling for quasi-brittle materials[J]. European Journal of Mechanics，2005，24(4)：593–613.
[12] 杨松林，徐卫亚，张贵金. 裂隙蠕变的稳定性准则[J]. 岩土力学，2003，24(3)：423–427.(YANG Songlin，XU Weiya，ZHAGN Guijin. Stability criterion for fracture creep[J]. Rock and Soil Mechanics，2003，24(3)：423–427.(in Chinese))
[13] 徐卫亚，杨松林. 裂隙岩体松弛模量分析[J]. 河海大学学报：自然科学版，2003，31(3)：295–298.(XU Weiya，YANG Songlin. Analysis of relaxation moduli of fissured rock mass[J]. Journal of Hohai University：Natural Sciences，2003，31(3)：295–298.(in Chinese))
[14] BORCHERT K M，HEBENER H，Richter T. Creep calculation on salt by using an endochronic material law compared to other creep formulation. Proceedings of the 1st conference on mechanical behaviour of salt. Pennsylvania：[s.n.]，1981：573–587.
[15] AUBERTIN M，GILL D E，LANDAYI B. An internal variable model for the creep of rocksalt[J]. Rock Mechanics and Rock Engineering，1991，24(2)：81–97. |
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2011, Vol. 30 
