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| EXPERIMENTAL RESEARCH ON MECHANICAL PROPERTIES OF DEEP MARBLE UNDER DIFFERENT INITIAL DAMAGE LEVELS AND UNLOADING PATHS |
| QIU Shili，FENG Xiating，ZHANG Chuanqing，YANG Jinbao |
| (State Key Laboratory of Geomechanics and Geotechnical Engineering，Institute of Rock and Soil Mechanics，Chinese Academy of Sciences，Wuhan，Hubei 430071，China) |
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Abstract Based on the research on unloading rates，the triaxial unloading confining pressure tests of deep marble under different initial damage levels and unloading paths are carried out systematically. Novel unloading mechanical parameters are proposed：increment ratio of strain increment to confining pressure increment，and uniform decreasing increment of confining pressure. Combining with the dilatational parameter and plastic internal variables，the control effect of initial damage level and unloading path on failure principle of unloading deformation of deep marble is analyzed. The origin and mechanisms of the principles obtained by the unloading and failure tests are explained through an intuitive conceptual model of unloading failure. Combining with deep tunnel projects，the major guiding significance of the initial damage level principles is discussed. The research results above can provide a theoretical basis for preventing the brittle failure of hard rock under high stress conditions，e.g. rockbursts.
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Received: 15 March 2012
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| [1] 哈秋舲，李建林，张永兴，等. 节理岩体卸荷非线性岩体力学[M]. 北京：中国建筑工业出版社，1998：11–27.(HA Qiuling，LI Jianlin，ZHANG Yongxing，et al. Nonlinear mechanics of jointed rock mass during unloading[M]. Beijing：China Architecture and Building Press，1998：11–27.(in Chinese)))
[2] 李天斌，王兰生. 卸荷应力状态下玄武岩变形破坏特征的试验研究[J]. 岩石力学与工程学报，1993，12(4)：321–327.(LI Tianbin， WANG Lansheng. An experimental study on deformation and failure features of basalt under unloading condition[J]. Chinese Journal of Rock Mechanics and Engineering，1993，12(4)：321–327.(in Chinese))
[3] 高春玉，徐 进，何 鹏，等. 大理岩加卸载力学特性的研究[J]. 岩石力学与工程学报，2005，24(3)：456–460.(GAO Chunyu，XU Jin，HE Peng，et al. Study of mechanical properties of marble under loading and unloading conditions[J]. Chinese Journal of Rock Mechanics and Engineering，2005，24(3)：456–460.(in Chinese))
[4] 李宏哲，夏才初，闫子舰，等. 锦屏水电站大理岩在高应力条件下的卸荷力学特性研究[J]. 岩石力学与工程学报，2007，26(10)： 2 104–2 109.(LI Hongzhe，XIA Caichu，YAN Zijian，et al. Study of marble unloading mechanical properties of Jinping hydropower station under high geostress conditions[J]. Chinese Journal of Rock Mechanics and Engineering，2007，26(10)：2 104–2 109.(in Chinese))
[5] 汪 斌，朱杰兵，邬爱清，等. 锦屏大理岩加、卸载应力路径下力学性质试验研究[J]. 岩石力学与工程学报，2008，27(10)：2 138– 2 145.(WANG Bin，ZHU Jiebing，WU Aiqing，et al. Experimental study of mechanical properties of Jinping marble under loading and unloading stress paths[J]. Chinese Journal of Rock Mechanics and Engineering，2008，27(10)：2 138–2 145.(in Chinese))
[6] 黄润秋，黄 达. 高地应力条件下卸荷速率对锦屏大理岩力学特性影响规律试验研究[J]. 岩石力学与工程学报，2010，29(1)：21–33.(HUANG Runqiu，HUANG Da. Experimental research on affection laws of unloading rates on mechanical properties of Jinping marble under high geostress[J]. Chinese Journal of Rock Mechanics and Engineering，2010，29(1)：21–33.(in Chinese))
[7] 吴 刚，孙 钧. 卸荷应力状态下裂隙岩体的变形和强度特性[J]. 岩石力学与工程学报，1998，17(6)：615–621.(WU Gang，SUN Jun. Deformation and strength characters of jointed rock mass under unloading stress states[J]. Chinese Journal of Rock Mechanics and Engineering，1998，17(6)：615–621.(in Chinese))
[8] 张 凯，周 辉，潘鹏志，等. 不同卸荷速率下岩石强度特性试验研究[J]. 岩土力学，2010，31(7)：2 072–2 078.(ZHANG Kai，ZHOU Hui，PAN Pengzhi，et al. Characteristics of strength of rocks under different unloading rates[J]. Rock and Soil Mechanics，2010，31(7)：2 072–2 078.(in Chinese))
[9] 尤明庆，华安增. 岩石试样的三轴卸围压试验[J]. 岩石力学与工程学报，1998，17(1)：24–29.(YOU Mingqing，HUA Anzeng. Triaxial confining pressure unloading test of rock sample[J]. Chinese Journal of Rock Mechanics and Engineering，1998，17(1)：24–29.(in Chinese))
[10] 邱士利. 深埋大理岩加卸荷变形破坏机制及岩爆倾向性评估方法研究[博士学位论文][D]. 武汉：中国科学院武汉岩土力学研究所，2011.(QIU Shili. Study on deformation and failure mechanism of deep-buried hard rock under loading and unloading conditions and rockburst vulnerability assessment methods[Ph. D. Thesis][D]. Wuhan：Institute of Rock and Soil Mechanics，Chinese Academy of Sciences，2011.(in Chinese))
[11] MARTIN C D. Seventeenth Canadian geotechnical colloquium：the effect of cohesion loss and stress path on brittle rock strength[J]. Canadian Geotechnical Journal，1997，34(5)：698–725.
[12] CAI M，KAISER P K，TASAKA Y，et al. Generalized crack initiation and crack damage stress thresholds of brittle rock masses near underground excavations[J]. International Journal of Rock Mechanics and Mining Sciences，2004，41(5)：833–847.
[13] 朱杰兵. 高应力下岩石卸荷及其流变特性研究[博士学位论文][D]. 中科院武汉岩土力学研究所，2009.(ZHU Jiebing. Study on unloading mechanics and its rheological properties of rock under high stress[Ph. D. Thesis][D]. Wuhan：Institute of Rock and Soil Mechanics，Chinese Academy of Sciences，2009.(in Chinese))
[14] 陈卫忠，吕森鹏，郭小红，等. 基于能量原理的卸围压试验与岩爆判据研究[J]. 岩石力学与工程学报，2009，28(8)：1 530–1 540. (CHEN Weizhong，LU Senpeng，GUO Xiaohong，et al. Research on unloading confining pressure tests and rockburst criterion based on energy theory[J]. Chinese Journal of Rock Mechanics and Engineering，2009，28(8)：1 530–1 540.(in Chinese))
[15] 胡云华. 高应力下花岗岩力学特性试验及本构模型研究[博士学位论文][D]. 武汉：中国科学院武汉岩土力学研究所，2008.(HU Yunhua. Study on mechanical properties of granites under high stress conditions and its constitutive models[Ph. D. Thesis][D]. Wuhan：Institute of Rock and Soil Mechanics，Chinese Academy of Sciences，2008.(in Chinese))
[16] 李志敬，朱珍德，施 毅，等. 高围压高水压条件下岩石卸荷强度特性试验研究[J]. 河海大学学报：自然科学版，2009，37(2)：162–165.(LI Zhijing，ZHU Zhende，SHI Yi，et al. Unloading strength properties of rocks under high confining pressure and hydraulic pressure[J]. Journal of Hohai University：Natural Sciences，2009，37(2)：162–165.(in Chinese))
[17] 邱士利，冯夏庭，张传庆，等. 不同卸围压速率下深埋大理岩卸荷力学特性试验研究[J]. 岩石力学与工程学报，2010，29(8)：1 807–1 817.(QIU Shili，FENG Xiating，ZHANG Chuanqing，et al. Experimental research on unloading mechanical properties of deep marble under pressures[J]. Chinese Journal of Rock Mechanics and Engineering，2010，29(8)：1 807–1 817.(in Chinese))
[18] KAISER P K，YAZICI S，MALONEY S. Mining-induced stress change and consequences of stress path on excavation stability—a case study[J]. International Journal of Rock Mechanics and Mining Sciences，2001，38(2)：167–180.
[19] HOEK E，BROWN E T. Underground excavations in rock[M]. London：Institution of Mining and Metallurgy，1982：320–470.
[20] 张宏博，宋修广，黄茂松，等. 不同卸荷应力路径下岩体破坏特征试验研究[J]. 山东大学学报：工学版，2007，37(6)：83–86.(ZHANG Hongbo，SONG Xiuguang，HUANG Maosong，et al. Research on failure features of rocks under different stress unloading paths[J]. Journal of Shandong University：Engineering Science，2007，37(6)：83–86.(in Chinese))
[21] 中华人民共和国行业标准编写组. SL264—2001水利水电工程岩石试验规程[S]. 北京：中国水利水电出版社，2001：38–44.(The Professional Standards Compilation Group of People?s Republic of China. SL264—2001 Specifications for rock tests in water conservancy and hydroelectric engineering[S]. Beijing：China Water Power Press，2001：38–44.(in Chinese)
[22] 尤明庆. 岩石的力学性质[M]. 北京：地质出版社，2007：31–59.(YOU Mingqing. Mechanical properties of rocks[M]. Beijing：Geological Publishing House，2007：31–59.(in Chinese)
[23] JAEGER J C，COOK N G W. Fundamentals of rock mechanics[M]. Norwich：Science Paperbacks，1976：121–211.
[24] ZHANG C Q，FENG X T，ZHOU H，et al. A top pilot tunnel preconditioning method for the prevention of extremely intense rockbursts in deep tunnels excavated by TBMs[J]. Rock Mechanics and Rock Engineering，2011，45(3)：289–309.
[25] 肖亚勋，冯夏庭，陈炳瑞，等. 深埋隧洞极强岩爆段隧道掘进机半导洞掘进岩爆风险研究[J]. 岩土力学，2011，32(10)：3 111–3 118. (XIAO Yaxun，FENG Xiating，CHEN Bingrui，et al. Rockburst risk of tunnel boring machine part-pilot excavation in very strong rockburst section of deep hard tunnel[J]. Rock and Soil Mechanics，2011，32(10)：3 111–3 118.(in Chinese))
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2012, Vol. 31 
