[1]何 攀,许 强*,刘佳良,等.基于核磁共振技术的结合水含量对重塑黄土抗剪强度影响试验研究[J].山地学报,2020,(4):571-580.[doi:10.16089/j.cnki.1008-2786.000535]
　HE Pan,XU Qiang*,LIU Jialiang,et al.Experimental Study on the Effect of Combined Water Content on Shear Strength of Remolded Loess based on NMR[J].Mountain Research,2020,(4):571-580.[doi:10.16089/j.cnki.1008-2786.000535]
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基于核磁共振技术的结合水含量对重塑黄土抗剪强度影响试验研究()
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《山地学报》[ISSN:1008-2186/CN:51-1516]

卷:
期数:
2020年第4期
页码:
571-580
栏目:
山地灾害
出版日期:
2020-09-27

文章信息/Info

Title:
Experimental Study on the Effect of Combined Water Content on Shear Strength of Remolded Loess based on NMR
文章编号:
1008-2786-(2020)4-571-10
作者:
何 攀; 许 强*; 刘佳良; 蒲川豪; 陈 达
成都理工大学 地质灾害防治与地质环境保护国家重点实验室,成都 610059
Author(s):
HE Pan;  XU Qiang*;  LIU Jialiang;  PU Chuanhao;  CHEN Da
State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology,Chengdu 610059, China
关键词:
重塑黄土;  抗剪强度;  结合水;  核磁共振;  T2截止值
Keywords:
remolded loess;  shear strength;  combined water;  NMR;  T2 cutoff value
DOI:
10.16089/j.cnki.1008-2786.000535
摘要:
重塑黄土抗剪强度对黄土重大工程的长期稳定与安全有着极其重要的影响,然而,由于传统测试方法的限制,对于结合水与抗剪强度之间关系的认识并不充分。本文基于无损、可靠、精确与便捷的核磁共振技术,针对不同含水率的重塑黄土开展了结合水发育特征与重塑黄土抗剪强度的试验研究。利用结合水与自由水的冰点不同,寻找二者的核磁共振信号界限—T2截止值,然后获取不同含水量直剪试样的核磁共振驰豫曲线,最后结合快剪试验分析结合水含量与土体抗剪强度的关系。试验结果表明:(1)重塑黄土内结合水含量随含水量的上升而增多,且增长趋势逐渐变缓,结合水所占比例也在不断地下降。(2)当土体内含水量增大时,并不会单独发育某一赋存状态的水,而是在某个含水率区间内主要发育某一种赋存状态的水。(3)重塑黄土中结合水的增加会导致粘聚力的降低,对内摩擦角没有明显影响。重塑黄土试样内结合水主要是通过削弱土体的粘聚力从而降低黄土土体抗剪强度,且土体内结合水含量与粘聚力c值及抗剪强度大小呈线性负相关。本文研究成果可为非饱和黄土边坡与高填方工程的稳定性计算等方面提供技术支持与理论参考。
Abstract:
Shear strength of remolded loess has a close connection with the stability and safety of major engineering projects in loess areas. Due to limitation of traditional testing methods, development characteristics of bound water and its influence on shear strength of loess were not clearly understood. In this study it performed some trials on loess based on reliable, accurate and convenient nuclear magnetic resonance(NMR)technique. In terms of the property of remolded loess, it firstly found boundary between combined water and free water according to the differences in their freezing points. Then the NMR relaxation curves of direct shear samples were obtained so as to determine the content of bound water as well as the relationship between content of bound water and shear strength of loess. The results show that:(1)Content of bound water in remolded loess increased with the addition of water content;(2)When the water content of soil body increased, the bound water or free water didn't vary independently; in case one dominate, and the other still exist in small quantities;(3)Increase of combined water content leaded to the decrease of cohesion in remolded loess, but the angle of internal friction did not change significantly, and the content of combined water was negatively correlated with c value and shear strength. This research results can provide technical support and theoretical reference for unsaturated loess slope construction and filling engineering.

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备注/Memo

备注/Memo:
收稿日期(Received date):2019-10-23; 改回日期(Accepted date): 2020-06-23
基金项目(Foundation item):国家自然科学基金重大项目(41790445); 国家自然科学基金重点项目(41630640)。[Major Projects of the National Natural Science Foundation of China(41790445); Key Projects of National Natural Science Foundation of China(41630640)]
作者简介(Biography):何攀(1995- ),男,硕士研究生,研究方向:岩土体稳定性及工程环境效应。 [HE Pan(1995-), male, M.Sc. candidate, research on stability of rock and soil mass and engineering environmental effect] E-mail: 502751270@qq.com
*通讯作者(Corresponding author):许强(1968- ),男,博士,教授,主要从事地质灾害预测评价及防治处理方面的教学与研究工作。[XU Qiang(1968-), male, Ph.D., professor, specialized in teaching and research of geological disaster prediction and evaluation and prevention and treatment] E-mail: xq@cdut.edu.cn
更新日期/Last Update: 2020-07-30