中文核心期刊
CSCD来源期刊
中国科技核心期刊
RCCSE中国核心学术期刊

重庆交通大学学报(自然科学版) ›› 2017, Vol. 36 ›› Issue (4): 69-75.DOI: 10.3969/j.issn.1674-0696.2017.04.12

• 港口航道·水利水电·资源环境 • 上一篇    下一篇

竖向荷载作用下非饱和土土-水特征研究

魏松1,2,3,邓奥1,姚振兴1,肖淑霞1,3   

  1. (1.合肥工业大学 土木与水利工程学院,安徽 合肥 230009;2.南京水利科学研究院 水利部土石坝破坏机理 与防控技术重点实验室,江苏 南京 210024;3.重庆交通大学 水利水运工程教育部重点实验室,重庆 400074)
  • 收稿日期:2015-10-21 修回日期:2016-01-11 出版日期:2017-04-20 发布日期:2017-05-02
  • 作者简介:魏松(1970—),男,安徽霍邱人,副教授,博士,主要从事岩土工程和水利工程方面的研究。E-mail:910884583@qq.com。 通信作者:邓奥(1992—),男,安徽肥西人,硕士研究生,主要从事水工结构方面的研究。E-mail:982793207@qq.com。
  • 基金资助:
    国家自然科学基金项目(51579063);水利部土石坝破坏机理与防控技术重点实验室开放研究基金项目(YK913005);安徽省自然科学基金项目(J2014AKZR0062);重庆交通大学水利水 运工程教育部重点实验室暨国家内河航道整治工程技术研究中心开放基金项目(SLK2011B02)

Soil-Water Characteristics of Unsaturated Soil under Vertical Load

WEI Song1, 2, 3, DENG Ao1, YAO Zhenxing1, XIAO Shuxia1, 3   

  1. 1. School of Civil and Hydraulic Engineering, Hefei University of Technology, Hefei 230009, Anhui, P. R. China; 2. Key Laboratory of Failure Mechanism and Safety Control Techniques of Earth-Rock Dam of the Ministry of Water Resources, Nanjing Hydraulic Research Institute, Nanjing 210024, Jiangsu, P. R. China; 3. Key Laboratory of Hydraulic and Waterway Engineering of the Ministry of Education, Chongqing Jiaotong University, Chongqing 400074, P. R. China)
  • Received:2015-10-21 Revised:2016-01-11 Online:2017-04-20 Published:2017-05-02

摘要: 总结了竖向应力作用对非饱和土土-水特征曲线影响的部分研究现状。试验得出合肥地区某工地土体基本物理性质指标,并利用FGJ-20型非饱和土固结仪对该土样进行了控制竖向荷载与 控制气压力的压缩试验。基于试验结果,对竖向荷载作用下非饱和土土-水特征进行了分析研究。结果表明:竖向荷载不同导致土-水特征曲线产生差异;竖向荷载对土-水特征曲线的影响随着 吸力的增大逐渐减弱;Fredlund-Xing三参数模型中参数a,m均随着竖向荷载的增大而逐渐增大,n值则逐渐减小;竖向荷载对土体含水率的影响程度与土体吸力大小有关,实际分析过程中需 考虑吸力范围的影响;在吸力不变时,土体含水率的变化量随着竖向荷载的增大呈先增后减的趋势。

关键词: 岩土工程, 非饱和土, 土-水特征曲线, 竖向荷载, 含水率, 基质吸力

Abstract: Some research statuses of the influence of vertical stress on SWCC (soil-water characteristic curve) were summarized. The basic physical properties of soil samples of a certain building site in Hefei were tested. Compression test of the soil samples under equal vertical load or equal air pressure were completed by FGJ-20 SDSWCC. Interaction between vertical load and unsaturated soil-water characteristics was analyzed according to test results. Results indicate that different vertical loads lead to the difference of soil-water characteristic curves; the influence of vertical load on the soil water characteristic curve gradually reduces with the enhancement of suction; with the increase of vertical load, the parameter a and parameter m increase while the parameter n decreases, and a, m, n are parameters in Fredlund-Xing three-parameter model; the influence of vertical load on soil moisture content is related with the matric suction of soil, and the influence of different suction ranges needs to be considered in actual analysis process; in the condition of equal soil suction, the variation of the water content of soil tends to raise at first and then reduce gradually with the increase of the vertical load.

Key words: geotechnical engineering, unsaturated soil, soil-water characteristic curve, vertical load, moisture content, matric suction

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