|
|
|
| EXPERIMENTAL INVESTIGATIONS ON STRUCTURAL ANISOTROPY
ON CREEP OF GREENSCHIST |
| WU Chuangzhou1，2，SHI Zhenming1，2，FU Yukai3，YANG Linde1，2，LI Qiushi1，2 |
(1. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education，Tongji University，Shanghai
200092，China；2. Department of Geotechnical Engineering，Tongji University，Shanghai 200092，China；
3. School of Geology Engineering and Geomatics，Chang?an University，Xi?an，Shaanxi 710054，China) |
|
|
|
|
Abstract In order to study the time-dependent deformation behavior of bedding anisotropy green schist of Jinping II hydropower station，this paper investigates the creep behavior of brittle bedding anisotropy rock by uniaxial compression creep experiments in laboratory. Six specimens were prepared with different inclination angles of bedding planes. Loading stress levels were graded 4 classes，and the maximum value of them were all approximately equal to the existing maximum initial geostress. All the strain-time curves of specimens did not exhibit the accelerated creep stage. The instantaneous elastic modulus and steady-state creep rate of specimens were obtained and analyzed based on the experiments data. The results show that the instantaneous elastic modulus of the specimens increases with the increment of stress level；and they were higher when the bedding planes are oblique to the compression direction；and the steady-state creep rate of the specimens increase with the increment of both stress level and the inclination angle of bedding planes；it reaches the maximum value with the inclination angle of the specimen close to the failure angle of rock.
|
|
Received: 19 April 2013
|
|
|
|
| [1] 孙 钧. 岩石流变力学及其工程应用研究的若干进展[J]. 岩石力学与工程学报，2007，26(6)：1 081–1 106.(SUN Jun. Rock rheological mechanics and its advance in engineering applications[J]. Chinese Journal of Rock Mechanics and Engineering，2007，26(6)：1 081–1 106. (in Chinese))
[2] 徐卫亚，杨圣奇，谢守益，等. 绿片岩三轴流变力学特性的研究(I)：试验结果[J]. 岩土力学，2005，26(4)：531–537.(XU Weiya，YANG Shengqi，XIE Shouyi，et al. Investigation on triaxial rheological mechanical properties of green schist specimen(I)：experimental results[J]. Rock and Soil Mechanics，2005，26(4)：531–537.(in Chinese))
[3] LI Y，XIA C T. Time-dependent tests on intact rocks in uniaxial compression[J]. International Journal of Rock Mechanics and Mining Sciences，2000，37(3)：467–473.
[4] CARTER N L，HORSEMAN S T，RUSSEL J E，et al. Rheology of rocksalt[J]. Journal of Structural Geology，1993，15(9/10)：1 257– 1 271.
[5] DUBEY R K，GAIROLA V K. Influence of structural anisotropy on creep of rocksalt from Simla Himalaya，India：an experimental approach[J]. Journal of Structural Geology，2008，30(6)：710–718.
[6] DUBEY R K，GAIROLA V K. Influence of stress rate on rheology an experimental study on rocksalt of Simla Himalaya，India[J]. International Journal of Geotechnical and Geological Engineering，2005，23(6)：757–772.
[7] 付志亮，高延法，宁 伟，等. 含油泥岩各向异性蠕变研究[J]. 采矿与安全工程学报，2007，24(3)：353–356.(FU Zhiliang，GAO Yanfa，NING Wei，et al. Creep of anisotropic oil shale[J]. Journal of Ming and Safety Engineering，2007，24(3)：353–356.(in Chinese))
[8] 熊良宵，杨林德，张 尧. 绿片岩的单轴压缩各向异性蠕变试验研究[J]. 同济大学学报：自然科学版，2010，38(11)：1 568–1 573. (XIONG Liangxiao，YANG Linde，ZHANG Yao. Anisotropic creep test of green schist under uniaxial compression[J]. Journal of Tongji University：Natural Science，2010，38(11)：1 568–1 573.(in Chinese))
[9] CRISTESCU N D，HUNSCHE U. Rock anisotropy，time effects in rock mechanics，Wiley series in materials，modeling and computation[M]. New York：John Wiley and Sons，1998：65–183.
[10] DONATH F A. Strength variations and deformational behaviour in anisotropic rock[C]// JUDD，W R ed. State of Stress in the Earth?s Crust. New York：Elsevier，1964：281–297.
[11] NIANDOU H，SHAO J F，HENRY J P，et al. Laboratory investigation of the mechanical behavior of Toumemire shale[J]. International Journal of Rock Mechanics and Mining Sciences，1997，34(1)：3–16.
[12] LI Y，XIA C T. Time-dependent tests on intact rocks in uniaxial compression[J]. International Journal of Rock Mechanics and Mining Sciences，2000，37(3)：467–473.
[13] RANALLI G. Rheology of the earth[M]. 2nd. London：Chapman and Hall，1995：1–3. |
|
|
|
2014, Vol. 33 
