[1]李杰林,刘汉文,周科平,等.冻融作用下岩石细观结构损伤的低场核磁共振研究[J].西安科技大学学报,2018,(02):266-272.[doi:10.13800/j.cnki.xakjdxxb.2018.0214]
 LI Jie-lin,LIU Han-wen,ZHOU Ke-ping,et al.An LF-NMR study of the micro-structural deterioration of rocks under the effect of freeze-thaw cycles[J].Journal of Xi'an University of Science and Technology,2018,(02):266-272.[doi:10.13800/j.cnki.xakjdxxb.2018.0214]
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冻融作用下岩石细观结构损伤的低场核磁共振研究(/HTML)
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西安科技大学学报[ISSN:1672-9315/CN:61-1434/N]

卷:
期数:
2018年02期
页码:
266-272
栏目:
出版日期:
2018-03-15

文章信息/Info

Title:
An LF-NMR study of the micro-structural deterioration of rocks under the effect of freeze-thaw cycles
文章编号:
1672-9315(2018)02-0266-07
作者:
李杰林12刘汉文12周科平12朱龙胤12
1.中南大学 资源与安全工程学院,湖南 长沙 410083; 2.中南大学 高海拔寒区采矿工程技术研究中心,湖南 长沙 410083
Author(s):
LI Jie-lin12LIU Han-wen12ZHOU Ke-ping12ZHU Long-yin12
(1.School of Resource and Safety Engineering,Central South University,Changsha 410083,China; 2.Mining Engineering Technology Research Center for High Altitude Cold Region,Central South University,Changsha 410083,China)
关键词:
冻融循环 核磁共振 细观结构 孔径分布
Keywords:
freeze-thaw cycles nuclear magnetic resonance micro-structure pore distribution
分类号:
TU 458+.2
DOI:
10.13800/j.cnki.xakjdxxb.2018.0214
文献标志码:
A
摘要:
为了研究冻融循环作用下岩石的细观结构损伤特性,以花岗岩为研究对象,进行了90次冻融循环实验,并采用核磁共振技术对冻融岩石进行了检测,得到了花岗岩的细观结构变化特征。结果表明:随着冻融循环次数的增多,花岗岩的孔隙度逐渐增大,在0~30次的冻融阶段,岩样的孔隙度增速缓慢,而在30~70次冻融循环阶段,孔隙度增长幅度明显加快,花岗岩的T2谱分布主要集中在0.1~100 ms; 将岩样的T2谱分布转化为岩石孔径分布曲线,统计出了冻融后花岗岩的孔隙分布结果,孔径分布在1~500 μm范围内最多,且以小孔孔隙为主,占总孔隙比例最高达78.62%,中孔次之,微孔数量最少。基于核磁共振技术的冻融循环作用岩石细观结构的损伤特性为研究岩石破坏机理提供了可靠的实验数据。
Abstract:
In order to study the characteristics of micro-structural deterioration of rocks under the effect of freeze-thaw cycles,a series of 90 freeze-thaw cycles experiments were conducted on granites,and the Low Field Nuclear Magnetic Resonance(LF-NMR)was used to test the frozen-thawed rocks,thus the micro-structural changing features of granites were acquired.The results show that as freeze-thaw cycles increase,the porosity of granite gradually grows.At the stage of 0~30 freeze-thaw cycles,the porosity of rock specimens grows slowly,yet at the stage of 30~70 freeze-thaw cycles,the porosity evidently grows quickly.The T2 spectral distribution of granites mainly exists within the range between 0.1 and 100 ms.The T2 spectral distribution was transformed into the distribution curve of rock pore sizes.Statistics of the pore distribution of granites after freeze-thaw cycles shows that pores of which the radius is within the range of 1~500 μm are the most,and they are mainly mini-pores,which take up a percentage as high as 78.62%.The meso-pores are less,and the micro-pores are the least.Based on NMR,the deterioration characteristics of rock microstructures after freeze-thaw cycles provide reliable experimental date for studying rock damage mechanism.

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备注/Memo

备注/Memo:
收稿日期:2017-11-10 责任编辑:刘 洁
基金项目:国家自然科学基金(41502327,51474252,51774323); 国家重大科学仪器设备开发专项(2013YQ17046310)
通信作者:李杰林(1982-),男,湖南宁远人,讲师,E-mail:lijielin@163.com
更新日期/Last Update: 2018-03-31