基于核磁共振技术的大理岩卸荷损伤演化规律研究

doi:10.13722/j.cnki.jrme.2014.s2.016

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摘要为研究岩石在卸荷作用下的细观结构损伤破坏规律，对大理岩岩样分别进行不同初始围压、不同卸荷围压比的常规三轴加–卸载试验，并对卸荷后的岩样进行核磁共振(NMR)测量，得到不同卸荷围压比作用后大理岩的弛豫时间T2谱分布、孔隙度和核磁共振成像图像。结果表明：(1) 随着卸荷围压比的增大，T2谱曲线不断右移，T2谱面积不断增大，孔隙度不断增大，反映出岩样内部损伤不断加剧；(2) 小孔隙的谱峰不断右移，但谱峰面积较小，反映出岩样内部小孔隙的孔径不断增大，但数量变化具有随机性，对岩样孔隙度变化影响微弱；卸荷围压比75%附近存在一临界值，小于临界值时，岩样内部不断产生新的细小裂纹，大于临界值时，产生新裂纹的趋势则受到遏制；(3) 大孔隙的谱峰不断右移，谱峰面积值较大且不断增大，占总谱面积的96%以上，反映出岩样内大孔隙孔径不断增大，数量不断增多，对岩样的孔隙度和损伤程度起主导作用；(4) 核磁共振图像动态地显示了不同卸荷围压比作用后岩样内部孔隙和裂隙的扩展、演化过程。

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	周科平
	胡振襄
	李杰林
	高峰
	王明球

关键词 ：岩石力学, 核磁共振, 岩石损伤, 岩石孔隙度, T2谱分布, 卸荷围压比

Abstract：To study the damage characteristics of rock microstructure under unloading condition，the loading and unloading confining pressure tests on the marble specimens under different initial confining pressures and different unloading confining pressure ratios are conducted. The crosswise relaxation time T2 distribution，rock porosity and nuclear magnetic resonance imaging(MRI) are obtained by the nuclear magnetic resonance(NMR) technique. The results show that：(1) As the unloading confining pressure ratio increases，the T2 spectrum curves move towards right with the spectrum areas keeping increasing，and the porosity of the specimens increases，which indicates that the damage of specimens increases. (2) As the unloading confining pressure ratio increases，the spectral peaks of small microcracks move towards right，but the spectrum areas of small microcracks are relatively small，which indicates that the size of small microcracks increases and the number of small microcracks changes randomly. The influence of small microcracks is weak to the porosity of the specimens. There is a critical value near the unloading confining pressure ratio of 75%. When the unloading confining pressure ratio is below the critical value，new microcracks appear constantly in the specimens. When the unloading confining pressure ratio is above the critical value，the generation of new microcracks is limited. (3) As the unloading confining pressure ratio increases，the spectral peaks of big microcracks move towards right. The spectrum areas of big microcracks keep increasing and account for over 96% of all microcracks in the rock specimens，which indicates that the size and number of big microcracks increase and the change of big microcracks determines the porosity and damage of rock. (4) The development process of microcracks and fracture in the rock specimens is shown dynamically.

Key words： rock mechanics nuclear magnetic resonance(NMR) rock damage rock porosity T2 spectrum distribution unloading confining pressure ratio

引用本文:

周科平，胡振襄，李杰林，高峰，王明球. 基于核磁共振技术的大理岩卸荷损伤演化规律研究[J]. 岩石力学与工程学报, 2014, 33(S2): 3523-3530.
ZHOU Keping，HU Zhenxiang，LI Jielin，GAO Feng，WANG Mingqiu. STUDY OF MARBLE DAMAGE EVOLUTION LAWS UNDER UNLOADING CONDITIONS BASED ON NUCLEAR MAGNETIC RESONANCE TECHNIQUE. , 2014, 33(S2): 3523-3530.

链接本文:

https://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2014.s2.016 或 https://rockmech.whrsm.ac.cn/CN/Y2014/V33/IS2/3523

[1] 周科平，古德生. 采矿环境再造理论方法及应用[M]. 长沙：中南大学出版社，2012：16–22.(ZHOU Keping，GU Desheng. Theory and methods of precondition rock mass for mining[M]. Changsha：Central South University Press，2012：16–22.(in Chinese))

[2] 李建林. 卸荷岩体力学[M]. 北京：中国水利水电出版社，2003：43–48.(LI Jianlin. Unloading rock mass mechanics[M]. Beijing：China Water Power Press，2003：43–48.(in Chinese))

[3] 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 the deformation and failure features of a basalt under unloading condition[J]. Chinese Journal of Rock Mechanics and Engineering，1993，12(4)：321–327.(in Chinese))

[4] 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))

[5] 沈军辉，王兰生，王青海，等. 卸荷岩体的变形破裂特征[J]. 岩石力学与工程学报，2003，22(12)：2 028–2 031.(SHEN Junhui，WANG Lansheng，WANG Qinghai，et al. Deformation and fracture features of unloaded rock mass[J]. Chinese Journal of Rock Mechanics and Engineering，2003，22(12)：2 028–2 031.(in Chinese))

[6] 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 on mechanical properties of marble under loading and unloading conditions[J]. Chinese Journal of Rock Mechanics and Engineering，2005，24(3)：456–460.(in Chinese))

[7] 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 on 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))

[8] 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.

[9] 黄润秋，黄达. 卸荷条件下花岗岩力学特性试验研究[J]. 岩石力学与工程学报，2008，27(11)：2 205–2 213.(HUANG Runqiu，HUANG Da. Experimental research on mechanical properties of granites under unloading condition[J]. Chinese Journal of Rock Mechanics and Engineering，2008，27(11)：2 205–2 213.(in Chinese))

[10] 黄润秋，黄达. 卸荷条件下岩石变形特征及本构模型研究[J]. 地球科学进展，2008，23(5)：441–447.(HUANG Runqiu，HUANG Da. Study on deformation characteristics and constitutive model of rock on the condition of unloading[J]. Advances in Earth Science，2008，23(5)：441–447.(in Chinese))

[11] 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(9)：1 807–1 817.(QIU Shili，FENG Xiating，ZHANG Chuanqing，et al. Experimental research on mechanical properties of deep-buried marble under different unloading rates of confining pressures[J]. Chinese Journal of Rock Mechanics and Engineering，2010，29(9)：1 807–1 817.(in Chinese))

[12] 邱士利，冯夏庭，张传庆，等. 不同初始损伤和卸荷路径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，2012，31(8)：1 686–1 697.(QIU Shili，FENG Xiating，ZHANG Chuanqing，et al. Experimental research on mechanical properties of deep marble under different initial damage levels and unloading paths[J]. Chinese Journal of Rock Mechanics and Engineering，2012，31(8)：1 686–1 697.(in Chinese))

[13] 张凯，周辉，潘鹏志，等. 不同卸荷速率下岩石强度特性研究[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))

[14] 王在泉，张黎明，孙辉，等. 不同卸荷速度条件下灰岩力学特性的试验研究[J]. 岩土力学，2011，32(4)：1 045–1 050.(WANG Zaiquan，ZHANG Liming，SUN Hui，et al. Experimental study of mechanical properties of limestone under different unloading velocities[J]. Rock and Soil Mechanics，2011，32(4)：1 045–1 050. (in Chinese))

[15] 胡建华，雷涛，罗先伟，等. 矿山采动卸荷岩体力学参数劣化规律研究[J]. 岩土力学，2012，33(4)：1 123–1 128.(HU Jianhua，LEI Tao，LUO Xianwei，et al. Study of mechanical parameters deterioration laws of rock mass in mining unloading[J]. Rock and Soil Mechanics，2012，33(4)：1 123–1 128.(in Chinese))

[16] 任建喜，罗英，刘文刚，等. CT检测技术在岩石加卸载破坏机制研究中的应用[J]. 冰川冻土，2002，24(5)：672–675.(REN Jianxi， LUO Ying，LIU Wengang，et al. Application of computerized topography testing technology on studying rock failure mechanism under loading and unloading[J]. Journal of Glaciology and Geocryology，2002，24(5)：672–675.(in Chinese))

[17] 周小平，张永新. 卸荷岩体本构理论及其应用[M]. 北京：科学出版社，2007：78–83.(ZHOU Xiaoping，ZHANG Yongxin. Unloading rock mass constitutive theory and application[M]. Beijing：Science Press，2007：78–83.(in Chinese))

[18] 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.(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.(in Chinese))

[19] COATES G，肖立志，PRAMMER M. 核磁共振测井原理与应用[M].孟繁萤译. 北京：石油工业出版社，2007：6–7.(COATES G，XIAO Lizhi，PRAMMER M. Nuclear magnetic resonance(NMR) logging principles and its application[M]. Translated by MENG Fanying. Beijing：Petroleum Industry Press，2007：6–7.(in Chinese))

[20] 张超谟，陈振标，张占松，等. 基于核磁共振T₂谱分布的储层岩石孔隙分形结构研究[J]. 石油天然气学报，2007，29(4)：80–86. (ZHANG Chaomo，CHEN Zhenbiao，ZHANG Zhansong，et al. Characteristics of reservoir rock pore fractal structure based on nuclear magnetic resonance(NMR) T₂ distribution[J]. Journal of Oil and Gas Technology，2007，29(4)：80–86.(in Chinese))

[21] 肖立志. 岩石核磁共振研究进展及其应用[J]. 测井技术，1996，20(1)：27–31.(XIAO Lizhi. Recent development on nuclear magnetic resonance in rock samples and its application[J]. Well Logging Technology，1996，20(1)：27–31.(in Chinese))