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| EXPERIMENTAL STUDY OF MECHANICAL PROPERTIES AND ENERGY MECHANISM OF KARST LIMESTONE UNDER NATURAL AND SATURATED STATES |
| GUO Jiaqi1，2，LIU Xiliang1，2，QIAO Chunsheng3 |
| (1. Opening Laboratory for Deep Mine Construction，Henan Polytechnic University，Jiaozuo，Henan 454003，China；2. School of Civil Engineering，Henan Polytechnic University，Jiaozuo，Henan 454003，China；3. School of Civil Engineering，Beijing Jiaotong University，Beijing 100044，China) |
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Abstract In order to study the influence of water saturation on mechanical properties and energy mechanism of karst limestone，uniaxial and pseudo-triaxial compression tests are carried out under natural and saturated states by rock mechanics test equipment RMT–150B. The testing results of mechanical properties indicate that saturation has a significant effect on the strength and deformation characteristics of karst limestone；and the regression relationship between peak strength and confining pressure can be expressed by Coulomb strength criterion in principal stress. Similar softening coefficient and their reduction rate decrease with the increased confining pressure. From the perspective of energy，the energy features and energy mechanism in the process of rock failure are studied by tests；and then some conclusions are drawn as fellows：the total absorbed energy U，releasable strain energy before peak stress and their increasing rates with axial strain under saturated condition are less than corresponding values of natural specimen. The release rate of after peak stress declines under two states with confining pressure，especially the release rate of for saturated specimen is larger in general. Each strain energy at peak stress increases linearly with the confining pressure；and the intrinsic reason for destroyed style difference is that the difference of dissipated energy under two states varies with confining pressure. Real-time evolution process of karst limestone specimen can be divided into different stages. As for dissipated energy，it differs slightly in compression and elastic deformation stage under two states；but in yield phase，dissipated energy of saturated rock increases faster.
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Received: 01 April 2013
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| [1] 李术才，薛翊国，张庆松，等. 高风险岩溶地区隧道施工地质灾害综合预报预警关键技术研究[J]. 岩石力学与工程学报，2008，27(7)：1 297–1 307.(LI Shucai，XUE Yiguo，ZHANG Qingsong，et al. Key technology study of comprehensive prediction and early-warning of geological hazards during tunnel construction in high-risk karst areas[J]. Chinese Journal of Rock Mechanics and Engineering，2008，27(7)：1 297–1 307.(in Chinese))
[2] 宋战平. 隐伏溶洞对隧道围岩–支护结构稳定性的影响研究[博士学位论文][D]. 西安：西安理工大学，2006.(SONG Zhanping. Research on the influence of concealed karst caverns upon the stability of tunnels and its support structure[Ph. D. Thesis][D]. Xi?an：Xi?an University of Technology，2006.(in Chinese))
[3] 李 奎. 隧道岩溶围岩力学特性的初步研究[硕士学位论文][D]. 成都：西南交通大学，2005.(LI Kui. Initial study of mechanical characteristics of surrounding rock in karst tunnel[M. S. Thesis][D]. Chengdu：Southwest Jiaotong University，2005.(in Chinese))
[4] 石祥锋. 岩溶区桩基荷载下隐伏溶洞顶板稳定性研究[博士学位论文][D]. 武汉：中国科学院武汉岩土力学研究所，2005.(SHI Xiangfeng. Study of the roof stability of concealed karst cave under pile foundation loading in karst areas[Ph. D. Thesis][D]. Wuhan：Institute of Rock and Soil Mechanics，Chinese Academy of Sciences，2005.(in Chinese))
[5] 李苍松，廖烟开，谷 婷. 岩溶围岩力学特性试验的初步研究[J]. 地下空间与工程学报，2007，3(7)：1 358–1 362.(LI Cangsong，LIAO Yankai，GU Ting. Preliminary study of mechanical property tests for karst rock[J]. Chinese Journal of Underground Space and Engineering，2007，3(7)：1 358–1 362. (in Chinese))
[6] 孟召平，潘结南，刘亮亮，等. 含水量对沉积岩力学性质及其冲击倾向性的影响[J]. 岩石力学与工程学报，2009，28(增1)：2 637– 2 643.(MENG Zhaoping，PAN Jienan，LIU Liangliang，et al. Influence of moisture content on mechanical properties of sedimentary rock and its bursting potential[J]. Chinese Journal of Rock Mechanics and Engineering，2009，28(Supp.1)：2 637–2 643.(in Chinese))
[7] PALCHIK V. On the ratios between elastic modulus and uniaxial compressive strength of heterogeneous carbonate rocks[J]. Rock Mechanics and Rock Engineering，2011，44(1)：121–128.
[8] 张 梅. 岩溶隧道高压富水充填溶腔释能降压新技术[M]. 北京：科学出版社，2010：105–120.(ZHANG Mei. New technology of energy release and depressurization method in karst tunnel through kasrt cave with high pressurized water[M]. Beijing：Science Press，2010：105–120.(in Chinese))
[9] 中华人民共和国国家标准编写组. GB/T50266—99工程岩体试验方法标准[S]. 北京：中国计划出版社，1999.(The National Standards Compilation Group of People?s Republic of China. GB/T50266—99 Standard for tests method of engineering rock masses[S]. Beijing：China Planning Press，1999.(in Chinese))
[10] 葛修润，周百海，刘明贵. 对岩石峰值后区特性的新见解[J]. 中国矿业，1992，1(2)：57–60.(GE Xiurun，ZHOU Baihai，Liu Minggui. A new understanding of post-failure behavior of rock[J]. China Mining Magazine，1992，1(2)：57–60.(in Chinese))
[11] HOEK E，WOOD D. A modified Hoek-Brown failure criterion for jointed rock masses[C]// Proceedings of International Conference of Eurock?92. Chest，England：[s.n.]，1992：202–214.
[12] 谢和平，鞠 杨，黎立云. 基于能量耗散与释放原理的岩石强度与整体破坏准则[J]. 岩石力学与工程学报，2005，24(17)：3 003– 3 010.(XIE Heiping，JU Yang，LI Liyun. Criteria for strength and structural failure of rocks based on energy dissipation and energy release principles[J]. Chinese Journal of Rock Mechanics and Engineering，2005，24(17)：3 003–3 010.(in Chinese))
[13] SOLECKI R，Conant R J. Advanced mechanics of materials[M]. London：Oxford University Press，2003：74–82.
[14] AUBERTIN M，GILLDE E，SIMON R. On the use of the brittleness index modified(BIM) to estimate the post-peak behavior of rock[C]// Proceedings of the 1st North American Rock Mechanics Symposium. Rotterdam：A. A. Balkema，1994：945–952.
[15] 杨圣奇，徐卫亚，苏承东. 岩样单轴压缩变形破坏与能量特征研究[J]. 固体力学学报，2006，27(2)：213–216.(YANG Shengqi，XU Weiya，SU Chengdong. Study of the deformation failure and energy properties of rock specimen in uniaxial compression[J]. ACTA Mechanics Solida Sinica，2006，27(2)：213–216.(in Chinese))
[16] 谢和平，彭瑞东，鞠 杨. 岩石变形破坏过程中的能量耗散分析[J]. 岩石力学与工程学报，2004，23(21)：3 565–3 570.(XIE Heping，PENG Ruidong，JU Yang. Energy dissipation of rock deformation and fracture[J]. Chinese Journal of Rock Mechanics and Engineering，2004，23(21)：3 565–3 570.(in Chinese))
[17] 熊德国，赵忠明，苏承东，等. 饱水对煤系地层岩石力学性质影响的试验研究[J]. 岩石力学与工程学报，2011，30(5)：998–1 005. (XIONG Deguo，ZHAO Zhongming，SU Chengdong，et al. Experimental study of effect of water-saturated state on mechanical properties of rock in coal measure strata[J]. Chinese Journal of Rock Mechanics and Engineering，2011，30(5)：998–1 005.(in Chinese))
[18] 朱 敏，邓华锋，周 时，等. 水岩作用下砂岩断裂韧度及抗拉强度的试验研究[J]. 三峡大学学报：自然科学版，2012，34(5)：34–38.(ZHU Ming，DENG Huafeng，ZHOU Shi，et al. Experimental research on fracture toughness and tensile strength of sandstone under water-rock interaction[J]. Journal of China Three Gorges University：Natural Science，2012，34(5)：34–38.(in Chinese))
[19] MARTIN C D，CHANDLER N A. The progressive fracture of Lac du Bonnet granite[J]. International Journal of Rock Mechanics and Mining Sciences and Geomechanics Abstracts，1994，31(6)：643–659.
[20] 黄 达，谭 清，黄润秋. 高应力强卸荷条件下大理岩损伤破裂的应变能转化过程机制研究[J]. 岩石力学与工程学报，2012，31(12)：2 483–2 493.(HUANG Da，TAN Qing，HUANG Runqiu. Mechanism of strain energy conversion process for marble damage and fracture under high stress and rapid unloading[J]. Chinese Journal of Rock Mechanics and Engineering，2012，31(12)：2 483–2 493.(in Chinese))
[21] 杨圣奇，徐卫亚，苏承东. 大理岩三轴压缩变形破坏与能量特征研究[J]. 工程力学，2007，24(1)：136–142.(YANG Shengqi，XU Weiya，SU Chengdong. Study of the deformation failure and energy properties of marble specimen under triaxial compression[J]. Engineering Mechanics，2007，24(1)：136–142.(in Chinese))
[22] 苏承东，张振华. 大理岩三轴压缩的塑性变形与能量特征分析[J]. 岩石力学与工程学报，2008，27(2)：274–280.(SU Chengdong，ZHANG Zhenhua. Analysis of plastic deformation and energy property of marble under pseudo-triaxial compression[J]. Chinese Journal of Rock Mechanics and Engineering，2008，27(2)：274–280.(in Chinese))
[23] 许国安，牛双建，靖洪文. 砂岩加卸载条件下能耗特征试验研究[J]岩土力学，2011，32(12)：3 611–3 617.(XU Guoan，NIU Shuangjian，JING Hongwen. Experimental study of energy feature of sandstone under loading and unloading[J]. Rock and Soil Mechanics，2011，32(12)：3 611–3 617.(in Chinese))
[24] 朱泽奇，盛 谦，肖培伟，等. 岩石卸围压破坏过程的能量耗散分析[J]. 岩石力学与工程学报，2011，30(增1)：2 675–2 681. (ZHU Zeqi，SHENG Qian，XIAO Peiwei，et al. Analysis of energy dissipation in process of unloading confining pressure failure of rock[J]. Chinese Journal of Rock Mechanics and Engineering，2011，30(Supp.1)：2 675–2 681.(in Chinese))
[25] 黄 达，黄润秋，张永兴. 粗晶大理岩单轴压缩力学特性的静态加载速率效应及能量机制试验研究[J]. 岩石力学与工程学报，2012，31(2)：245–255.(HUANG Da，HUANG Runqiu，ZHANG Yongxing. Experimental investigation on static loading rate effects on mechanical properties and energy mechanism of coarse crystal grain marble under uniaxial compression[J]. Chinese Journal of Rock Mechanics and Engineering，2012，31(2)：245–255.(in Chinese))
[26] 张志镇，高 峰. 单轴压缩下岩石能量演化的非线性特性研究[J]. 岩石力学与工程学报，2012，31(6)：1 201–1 207.(ZHANG Zhizhen，GAO Feng. Research on nonlinear characteristics of rock energy evolution under uniaxial compression[J]. Chinese Journal of Rock Mechanics and Engineering，2012，31(6)：1 201–1 207.(in Chinese))
[27] 于德海，彭建兵. 三轴压缩下水影响绿泥石片岩力学性质试验研究[J]. 岩石力学与工程学报，2009，28(1)：205–211.(YU Dehai，PENG Jianbing. Experimental study of mechanical properties of chlorite schist with water under triaxial compression[J]. Chinese Journal of Rock Mechanics and Engineering，2009，28(1)：205–211.(in Chinese)) |
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2014, Vol. 33 
