固化盐渍土核磁共振微观特征

doi:10.16285/j.rsm.2017.1152

岩土力学 ›› 2019, Vol. 40 ›› Issue (1): 245-249.doi: 10.16285/j.rsm.2017.1152

固化盐渍土核磁共振微观特征

吕擎峰¹，周刚¹，王生新²，霍振升¹，马博¹

1. 兰州大学西部灾害与环境力学教育部重点实验室，甘肃兰州，730000；2. 甘肃省科学院地质自然灾害防治研究所，甘肃兰州，730000

收稿日期:2017-06-07 出版日期:2019-01-11 发布日期:2019-01-31
通讯作者: 王生新，男，1966年生，博士，研究员，主要从事黄土地基处理与地质灾害方面的研究工作。E-mail: wsx5003@163.com E-mail: lvqf@lzu.edu.cn
作者简介:吕擎峰，男，1971年生，博士，副教授，主要从事岩土工程方面的研究工作
基金资助:
国家自然科学基金项目(No. 51469001)。

Microstructure characteristics of solidified saline soil based on nuclear magnetic resonance

LÜ Qing-feng¹, ZHOU Gang¹, WANG Sheng-xin², HUO Zhen-sheng¹, MA Bo¹

1. Key Laboratory of Mechanics on Western Disaster and Environment Mechanics of Ministry of Education, Lanzhou University, Lanzhou, Gansu 730000, China; 2.Geological Hazards Research and Prevention Institute, Gansu Academy of Sciences, Lanzhou, Gansu 730000, China

Received:2017-06-07 Online:2019-01-11 Published:2019-01-31
Supported by:
This work was supported by the National Natural Science Foundation of China (51469001).

摘要/Abstract

摘要： 采用核磁共振技术，对不同配比的水玻璃、石灰+粉煤灰及石灰+粉煤灰+水玻璃的固化盐渍土的微观特征进行检测，结合无侧限抗压强度试验，分析了各固化方案的盐渍土固化效果，讨论了强度成因的微观特征机制。结果表明，不同固化土的孔隙特征有较大差异。石灰+粉煤灰固化盐渍土大孔隙减少；石灰+粉煤灰+水玻璃固化盐渍土孔隙总体积减少，但同时有大孔隙生成；水玻璃固化盐渍土孔隙总体增多，但随水玻璃浓度增大，孔隙体积有所减小。石灰+粉煤灰+水玻璃固化盐渍土抗压强度远大于其他固化方案，但是其孔隙结构并不是最优，说明颗粒间的胶结情况对固化效果的影响远大于孔隙特征。

关键词: 核磁共振, 固化盐渍土, 无侧限抗压强度, 微观特征, 孔隙, 胶结

Abstract: NMR technique was used to test the micro-structural characteristics of the saline soil solidified with different proportions of water glass, lime and fly ash, lime and fly ash and water glass respectively. Combined the unconfined compression strength tests, the solidified effect of saline soil was analyzed, and the microstructure characteristic mechanism of strength cause was discussed. The results showed that the pore characteristics of different solidified soil were quite different. The macro-pores in saline soil solidified with lime and fly ash were reduced, while the total pore volume in saline soil solidified with water glass, lime and fly ash was decreased, but the macro-pores were increased. The pores in saline soil solidified with water glass were increased, but the pore volume decreased with the increase of water glass concentration. The compression strength of the soil solidified with water glass, lime and fly ash was greater than that of other solidification schemes, but its pore structure was not optimal, which indicated that the effect of cement between particles on solidification was much greater than that of pore characteristics.

Key words: nuclear magnetic resonance（NMR）, solidified saline soil, unconfined compression strength, microscopic characteristics, pore, cementation

中图分类号:

TU 411

吕擎峰, 周刚, 王生新, 霍振升, 马博, . 固化盐渍土核磁共振微观特征[J]. 岩土力学, 2019, 40(1): 245-249.

LÜ Qing-feng, ZHOU Gang, WANG Sheng-xin, HUO Zhen-sheng, MA Bo, . Microstructure characteristics of solidified saline soil based on nuclear magnetic resonance[J]. Rock and Soil Mechanics, 2019, 40(1): 245-249.

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固化盐渍土核磁共振微观特征

Microstructure characteristics of solidified saline soil based on nuclear magnetic resonance

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