长江科学院院报 ›› 2019, Vol. 36 ›› Issue (1): 74-77.DOI: 10.11988/ckyyb.20170928

• 岩土工程 • 上一篇    下一篇

两种重塑土样的结构性差异试验分析

郑郧1,2, 马巍2, 李国玉2, 穆彦虎2   

  1. 1.长江科学院 水利部岩土力学与工程重点实验室,武汉 430010;
    2.中国科学院 西北生态环境资源研究院冻土工程国家重点试验室,兰州 730000
  • 收稿日期:2017-08-15 出版日期:2019-01-01 发布日期:2019-01-17
  • 作者简介:郑 郧(1986-),女,湖北十堰人,工程师,博士,主要从事冻土工程与环境、岩土工程等方面的研究。 E-mail:yunzheng@lzb.ac.cn
  • 基金资助:
    冻土工程国家重点实验室开放基金项目(SKLFSE201603);国家自然科学基金重点项目(41630636);长江科学院中央级公益性科研院所基本科研业务费项目(CKSF2017009/YT,CKSF2017045/SZ);甘肃省科技重大专项计划项目(143GKDA007);国家自然科学基金青年基金项目(41401077)

Laboratory Study on Structural Performance of Two Reconstituted Soil Samples

ZHENG Yun1,2, MA Wei2, LI Guo-yu2, MU Yan-hu2   

  1. 1.Key Laboratory of Geotechnical Mechanics and Engineering of Ministry of Water Resources, Yangtze RiverScientific Research Institute,Wuhan 430010, China;
    2.State Key Laboratory of Frozen Soil Engineering,Northwest Institute of Eco-environment and Resources,Chinese Academy of Sciences,Lanzhou 730000, China
  • Received:2017-08-15 Online:2019-01-01 Published:2019-01-17

摘要: 结构性是土体的固有属性,对土体的物理力学和工程性质有强烈影响。天然黏土普遍具有结构性,重塑土样因为制样方法不同也具有不同程度的结构性。在结构性的试验研究中常常需要使用具有一定结构性的重塑土样。为了探讨制样方法对重塑土样结构性的影响,在实验室内制备了2种尺寸形状、土壤材料、干密度和含水率均相同,但饱和方法不同的重塑土样,并通过单轴压缩和加卸载试验分析和比较了2种土样在均匀性和结构性方面的差异。试验发现:未经真空抽气饱和的土样,其单轴压缩平行试验的重复性较好,土样的压缩曲线具有较明显的结构性特征;真空抽气饱和会对土样产生一定限度的随机扰动,使土样的均匀性变差、结构性变弱。

关键词: 重塑土, 结构性, 均匀性, 真空抽气饱和, 单轴压缩, 加卸载

Abstract: Natural clays are generally structural clays, and reconstituted soil samples also have some structural characteristics due to different sample preparation processes. Structural reconstituted soil samples are usually used in laboratory studies, and the sample preparation conditions have great influences on samples’ structural characteristics. Two kinds of reconstituted soil samples (with the same size, soil type, dry density, and moisture content, yet with different saturation methods) were prepared and the structural characteristics were analyzed by uniaxial compression and uniaxial loading-unloading compression tests. It was found that vacuum suction saturation could weaken the structures and uniformities of reconstituted soil samples, and the soil samples without vacuum suction saturation had very good initial uniformity and typical structural characteristics.

Key words: reconstituted soil, structural characteristics, uniformity, vacuum suction saturation, uniaxial compression, loading-unloading

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