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| RESEARCH ON DAMAGE MODEL OF SINGLE JOINTED ROCK MASSES UNDER COUPLING ACTION OF FREEZE-THAW AND LOADING |
| LI Xinping1，LU Yani1，2，WENG Yangjun1 |
| (1. Key Laboratory of Roadway，Bridge and Structure Engineering，Wuhan University of Technology，Wuhan，Hubei 430070，China；2. School of Urban Construction，Hubei Engineering University，Xiaogan，Hubei 432000，China) |
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Abstract For rock masses under freeze-thaw and loading in engineering structures in cold regions，using rock-like materials produced rock specimens with different geometric characteristics，based on the freeze-thaw experiments and uniaxial compression test，the influence of crack dip angle and crack length on the rock masses strength were studied；and combining mesoscopic damage theory and macroscopic statistical damage model，the damage model of freeze-thaw and loading rock masses were established；at the same time，damage degradation mechanism of jointed rock masses under the coupling action of freeze-thaw and loading were discussed. The research results show that：(1) The freeze-thaw damage is a process of fatigue damage；and loading damage is an uneven distribution process of stress field and deformation. (2) Freeze-thaw and loading with different mechanisms promote rock crack initiation and propagation；hence induced damages couple with each other，the coupling of the two will make the total damage deterioration. (3) Crack length and freeze-thaw cycles on total damage is larger；the influence of crack dip angle on the total damage is relatively small. (4) under the same cycles of freeze-thaw，damage degradation of cracking rocks is more serious than the intact samples.
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Received: 21 May 2013
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| [1] 沈珠江. 抗风化设计——未来岩土工程设计的一个重要内容[J]. 岩土工程学报，2004，26(6)：866–869.(SHEN Zhujiang. Weathering resistant design：an important aspect of future development of geo- technical engineering design[J]. Chinese Journal of Geotechnical Engineering，2004，26(6)：866–869.(in Chinese))
[2] 徐光苗，刘泉声. 岩石冻融破坏机制分析及冻融力学试验研究[J]. 岩石力学与工程学报，2005，24(17)：3 076–3 082.(XU Guangmiao，LIU Quansheng. Analysis of mechanism of rock failure due to freezing-thawing cycling and mechanical testing study on frozen- thawed rocks[J]. Chinese Journal of Rock Mechanics and Engineering，2005，24(17)：3 076–3 082.(in Chinese))
[3] 王 俐，杨春和. 不同初始饱水状态红砂岩冻融损伤差异性研究[J]. 岩土力学，2006，27(10)：1 772–1 776.(WANG Li，YANG Chunhe. Studies on different initial water-saturated red sandstones′ different damaged extensions under condition of frost and thaw[J]. Rock and Soil Mechanics，2006，27(10)：1 772–1 776.(in Chinese))
[4] TAN X J，CHEN W Z，YANG J P，et al. Laboratory investigations on the mechanical properties degradation of granite under freeze-thaw cycles[J]. Cold Regions Science and Technology，2011，68(3)：130–138.
[5] NICHOLSON H，DAWN T，NICHOLSON F. Physical deterioration of sedimentary rocks subjected to experimental freezing-thawing weathering[J]. Earth Surface Processes and Landforms，2000，25(12)：1 295–1 308.
[6] YAMABE T，NEAUPANE K M. Determination of some thermomechanical properties of Sirahama sandstone under subzero temperature condition[J]. International Journal of Rock Mechanics and Mining Sciences，2001，38(7)：1 029–1 034.
[7] 吴 刚，何国梁，张 磊，等. 大理岩循环冻融试验研究[J]. 岩石力学与工程学报，2006，25(增1)：2 930–2 938.(WU Gang，HE Guoliang，ZHANG Lei，et al. Experimental study on cycles of freezing-thawing marble[J]. Chinese Journal of Rock Mechanics and Engineering，2006，25(Supp.1)：2 930–2 938.(in Chinese))
[8] CHEN T C，YEUNG M R，MORIC N. Effect of water saturation on deterioration of welded tuff due to freeze-thaw action[J]. Cold Regions Science and Technology，2004，38(1)：127–136.
[9] 李杰林，周科平，张亚民，等. 基于核磁共振技术的岩石孔隙结构冻融损伤试验研究[J]. 岩石力学与工程学报，2012，31(6)：1 208– 1 214.(LI Jielin，ZHOU Keping，ZHANG Yamin，et al. Experimental study of rock porous structure damage characteristics under condition of freezing-thawing cycles based on nuclear magnetic resonance technique[J]. Chinese Journal of Rock Mechanics and Engineering，2012，31(6)：1 208–1 214.(in Chinese))
[10] 许玉娟，周科平，李杰林，等. 冻融岩石核磁共振检测及冻融损伤机制分析[J]. 岩土力学，2012，33(10)：3 001–3 004.(XU Yujuan，ZHOU Keping，LI Jielin，et al. Study of rock NMR experiment and damage mechanism analysis under freeze-thaw condition[J]. Rock and Soil Mechanics，2012，33(10)：3 001–3 004.(in Chinese))
[11] 母剑桥，裴向军，黄 勇，等. 冻融岩体力学特性实验研究[J]. 工程地质学报，2013，21(1)：103–108.(MU Jianqiao，PEI Xiangjun，HUANG Yong，et al. Experimental research on mechanical characteristics of rock with cycles of freeing-thawing action[J]. Journal of Engineering Geology，2013，21(1)：103–108.(in Chinese))
[12] 张慧梅，杨更社. 岩石冻融力学实验及损伤扩展特性[J]. 中国矿业大学学报，2011，40(1)：140–145.(ZHANG Huimei，YANG Gengshe. Freeze-thaw cycling and mechanical experiment and damage propagation characteristics of rock[J]. Journal of China University of Mining and Technology，2011，40(1)：140–145.(in Chinese))
[13] 杨更社，谢定义，张长庆，等. 岩石损伤扩展力学特性的CT分析[J]. 岩石力学与工程学报，1999，18(3)：250–254.(YANG Gengshe，XIE Dingyi，ZHANG Changqing，et al. CT analysis of mechanical characteristics of damage propagation of rock[J]. Chinese Journal of Rock Mechanics and Engineering，1999，18(3)：250–254.(in Chinese))
[14] 赖远明，吴紫汪，朱元林，等. 大坂山隧道围岩冻融损伤的CT分析[J]. 冰川冻土，2000，22(3)：206–210.(LAI Yuanming，WU Ziwang，ZHU Yuanlin，et al. CT analysis of frost damage of the surrounding rocks of a tunnel in the Daban mountain[J]. Journal of Glaciology and Geocryology，2000，22(3)：206–210.(in Chinese))
[15] FARMER I W. Engineering properties of rocks[M]. 2nd ed. London：Chapman and Hall，1983：36–45.
[16] 李晓红，卢义玉，康 勇，等. 岩石力学实验模拟技术[M]. 北京：科学出版社，2007：6–24.(LI Xiaohong，LU Yiyu，KANG Yong，et al. Simulation experiment technique of rock mechanics[M]. Beijing：Science Press，2007：6–24.(in Chinese))
[17] 杨圣奇，戴永浩，韩立军，等. 断续预制裂隙脆性大理岩变形破坏特性单轴压缩试验研究[J]. 岩石力学与工程学报，2009，28(12)：2 391–2 404.(YANG Shengqi，DAI Yonghao，HAN Lijun，et al. Uniaxial compression experimental research on deformation and failure properties of brittle marble specimen with pre-existing fissures[J]. Chinese Journal of Rock Mechanics and Engineering，2009，28(12)：2 391–2 404. (in Chinese))
[18] 张全胜，杨更社，任建喜. 岩石损伤变量及本构方程的新探讨[J]. 岩石力学与工程学报，2003，22(1)：30–34.(ZHANG Quansheng，YANG Gengshe，REN Jianxi. New study of damage variable and constitutive equation of rock[J]. Chinese Journal of Rock Mechanics and Engineering，2003，22(1)：30–34.(in Chinese))
[19] 吴 政，张承娟. 单向荷载作用下岩石损伤模型及其力学特性研究[J]. 岩石力学与工程学报，1996，15(1)：55–61.(WU Zheng，ZHANG Chengjuan. Investigation of rock damage model and its mechanical behavior[J]. Chinese Journal of Rock Mechanics and Engineering，1996，15(1)：55–61.(in Chinese))
[20] HORI M. Micromechanical analysis of deterioration due to freezing and thawing in porous brittle materials[J]. International Journal of Engineering Science，1998，36(4)：511–522. |
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2013, Vol. 32 
