冻融花岗岩细观损伤演化的核磁共振
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摘要
为研究岩石经历冻融循环后的细观损伤演化特征,选取寒区花岗岩岩心为试样,划分为5组,在饱和状态下分别对各组进行多轮冻融循环试验,利用核磁共振技术在每轮冻融循环结束之后对试样进行检测,获得岩石在不同冻融阶段的试件表面变化、质量变化、弛豫时间T2分布、孔隙度变化和孔隙分布及结构成像等。通过对冻融循环数与试样质量、孔隙度等之间的关系进行分析对比,表明试样在冻融循环作用下岩石内部孔隙不断损伤扩展,孔隙度提高,使得试样在饱和状态下的质量增加。通过对比不同轮次核磁共振结构成像图,结合孔隙分布和孔隙度增长规律,总结岩石在冻融循环试验中的细观损伤的演化模式,为研究寒区岩体的破坏机理提供一定的理论依据。
To get the microscopic damage of rock,granite rock from cold region was selected as samples(saturated) to conduct freeze-thaw cycle experiment of different cycle index.Nuclear magnetic resonance(NMR) technology was used to detect microscopic damage of rock samples after each cycle group.The changes of samples’ surface,variation of mass,T2 spectrum,porosity changes distribution and porosity NMR images of different stage were obtained.The results indicate that pores in the rock expand and porosity increases,mass of samples in the condition of saturated also grows with the growing cycle numbers.Degradation evolution mode is obtained by comparative analysis of NMR images and porosity distribution and its increasing principle of different cycle index.This research will provide theoretical basis for the study of rock deterioration principle in cold region.
To get the microscopic damage of rock,granite rock from cold region was selected as samples(saturated) to conduct freeze-thaw cycle experiment of different cycle index.Nuclear magnetic resonance(NMR) technology was used to detect microscopic damage of rock samples after each cycle group.The changes of samples’ surface,variation of mass,T2 spectrum,porosity changes distribution and porosity NMR images of different stage were obtained.The results indicate that pores in the rock expand and porosity increases,mass of samples in the condition of saturated also grows with the growing cycle numbers.Degradation evolution mode is obtained by comparative analysis of NMR images and porosity distribution and its increasing principle of different cycle index.This research will provide theoretical basis for the study of rock deterioration principle in cold region.
引文
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[14]Coates G,肖立志,Prammer M.核磁共振测井原理与应用[M].孟繁萤,译.石油工业出版社,2007:2-3.Coates G,XIAO Lizhi,Prammer M.NMR logging principles and application[M].MENG Fanying trans.Beijing:Petroleum Industry Press,2007:2-3.
[15]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):3076-3082.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):3076-3082.
[16]许锡昌,刘泉声.高温下花岗岩基本力学性质初步研究[J].岩土工程学报,2000,22(3):332-335.XU Xichang,LIU Quansheng.A preliminary study on basic mechanical properties for granite at high temperature[J].Chinese Journal of Geotechnical Engineering,2000,22(3):332-335.
[2]董瑞琨,许兆义,杨成永.青藏高原冻融侵蚀动力特征研究[J].水土保持学报,2000,12(4):12-16.DONG Ruikun,XU Zhaoyi,YANG Chengyong.Dynamic and characteristic of freeing-thawing erosion on qinghai-tibet plateau[J].Journal of Soil and Water Conservation,2000,12(4):12-16.
[3]Soloatin V I.Water migration and ice segregation in the transition zone between thawed and frozen soil[J].Perm a Frost and Periglacial Processes,1995,5(2):185-190.
[4]Nicholson,Dawn T,Nicholson F H.Physical deterioration of sedimentary rocks subjected to experimental freeze-thaw weathering[J].Earth Surface Processes and landforms,2000,25:1295-1308.
[5]陈玉超,杨更社,范建兵.寒区边坡冻融灾害及其分类探讨[J].山西建筑,2006,32(14):82-83.CHEN Yuchao,YANG Gengshe,FAN Jianbing.The discussion of freezing-thawing disaster and classification in permafrost slope[J].Shanxi Architecture,2006,32(14):82-83.
[6]徐光苗.寒区岩体低温、冻融损伤力学特性及多场耦合研究[D].武汉:中国科学院武汉岩土力学研究所,2006:Ⅰ-Ⅱ.XU Guangmiao.Study on mechanical characteristics of rock at low temperature due to freezing-thawing and multi-physical coupling problems of rock in cold regions[D].Wuhan:Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,2006:Ⅰ-Ⅱ.
[7]王家禄,高建,刘莉.应用CT技术研究岩石孔隙变化特征[J].石油学报,2009,30(6):887-893.WANG Jialu,GAO Jian,LIU Li.Porosity characteristics of sandstone by X-ray CT scanning system[J].Acta Petrolei Sinica,2009,30(6):887-893.
[8]刘成禹,何满潮,王树仁,等.花岗岩低温冻融损伤特性的实验研究[J].湖南科技大学学报:自然科学版,2005,20(1):37-40.LIU Chengyu,HE Manchao,WANG Shuren,et al.Experimental investigation freeze-thawing damage characteristics of granite at low temperature[J].Journal of Hunan University of Science&Technology:Natural Science Edition,2005,20(1):37-40.
[9]丁卫华,仵彦卿,蒲毅彬,等.X射线岩石CT的历史与现状[J].地震地质,2003,25(3):467-476.DING Weihua,WU Yanqing,PU Yibin,et al.History and present situation of X-RAY computerized tomography(CT)of rocks[J].Seismology and Geology,2003,25(3):467-476.
[10]肖立志.核磁共振成像测井与岩石核磁共振及其应用[M].北京:科学出版社,1998:2-8.XIAO Lizhi.NMR imaging logging principles and applications[M].Beijing:Science Press,1998:2-8.
[11]肖立志.核磁共振成像在EOR研究中的应用[J].石油学报,1995,16(3):106-110.XIAO Lizhi.A study on the application of NMR imaging to EOR[J].Journal of Oil,1995,16(3):106-110.
[12]石强,潘一山.煤体内部裂隙和流体通道分析的核磁共振成像方法研究[J].煤矿开采,2005,10(6):6-9SHI Qiang,PAN Yishan.A method of nuclear magnetic resonance imaging analyzed in the crack and flu id pass way of coal body[J].Coal Mining,2005,10(6):6-9.
[13]陈权.岩石核磁共振及其在渗流力学和油田开发中的应用研究[D].武汉:中国科学院武汉物理与数学研究所,2000:1-3.CHEN Quan.NMR and MRI study on reservoir rock and application to porous flow mechanics and petroleum engineering[D].Wuhan:Institute of Physics and Mathematics,Chinese Academy of Sciences,2000:1-3.
[14]Coates G,肖立志,Prammer M.核磁共振测井原理与应用[M].孟繁萤,译.石油工业出版社,2007:2-3.Coates G,XIAO Lizhi,Prammer M.NMR logging principles and application[M].MENG Fanying trans.Beijing:Petroleum Industry Press,2007:2-3.
[15]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):3076-3082.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):3076-3082.
[16]许锡昌,刘泉声.高温下花岗岩基本力学性质初步研究[J].岩土工程学报,2000,22(3):332-335.XU Xichang,LIU Quansheng.A preliminary study on basic mechanical properties for granite at high temperature[J].Chinese Journal of Geotechnical Engineering,2000,22(3):332-335.
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