›› 2017, Vol. 38 ›› Issue (S1): 381-386.doi: 10.16285/j.rsm.2017.S1.047

• 岩土工程研究 • 上一篇    下一篇

合肥重塑膨胀土三向膨胀力试验研究

池泽成1, 2,陈善雄2,周 哲1, 2,戴张俊2,宋瑞军1, 2   

  1. 1. 中国科学院大学,北京 100049;2. 中国科学院武汉岩土力学研究所 岩土力学与工程国家重点实验室,湖北 武汉 430071
  • 收稿日期:2017-01-03 出版日期:2017-06-22 发布日期:2018-06-05
  • 作者简介:池泽成,男,1992年生,博士研究生,主要从事特殊土工程特性与处治技术方面的研究工作。
  • 基金资助:

    国家自然科学基金项目(No. 51579236)

An experimental study of three-dimensional swelling pressure of Hefei remolded expansive clay

CHI Ze-cheng1, 2, CHEN Shan-xiong2, ZHOU Zhe1, 2, DAI Zhang-jun2, SONG Rui-jun1, 2   

  1. 1. University of Chinese Academy of Sciences,Beijing 100049, China; 2. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, Hubei 430071, China
  • Received:2017-01-03 Online:2017-06-22 Published:2018-06-05
  • Supported by:

    This work was supported by the National Natural Science Foundation of China(51579236).

摘要: 以合肥重塑膨胀土为研究对象,采用改进的三向胀缩仪开展了16组不同初始含水率与干密度的三向膨胀力试验。研究结果表明,(1)在所研究的含水率、干密度范围内竖向膨胀力总是大于横向膨胀力,快速膨胀阶段大致在0~2 h以内,该阶段竖向膨胀力可达到极限膨胀力的80%以上;(2)同一干密度下竖向膨胀力随初始含水率增大而减小,竖向膨胀力与初始含水率之间具有良好的线性关系,且干密度越大,竖向膨胀力随着初始含水率的变化速率越大;(3)在竖向膨胀力与干密度的关系图中,每条曲线均以干密度1.6 g/cm3为分界点呈双线性关系;(4)由膨胀力对数与初始干密度的关系,不同初始含水率下的ln(Pz)-ρd关系为一系列近似平行的递增直线,直线斜率大致相同,说明膨胀力随初始干密度的变化速度不随含水率的变化而变化。

关键词: 重塑膨胀土, 三向胀缩仪, 竖向膨胀力, 水平膨胀力

Abstract: This paper studies the characteristics of Hefei remolded expansive clay. A series of three-dimensional swelling tests is conducted on cubic expansive soil of different initial moisture contents and dry densities. For the specimens investigated in this study, three-dimensional swelling pressures are unequal. The vertical swelling pressure is larger than lateral swelling pressure. The period of the rapid expansion is about 0-2 h; the vertical swelling pressure can reach more than 80% of the limit swelling pressure. Secondly, under the same dry density, the vertical swelling pressure decreases with the rise of initial moisture content; and there is a good linear relationship between these two elements. Meanwhile, with the increase of dry density, the rate of change between them also rises correspondingly. Furthermore, the graph of the relationship between the vertical swelling pressure and dry density illustrates that each curve presents bilinear relation based on the segmentation point which is dry density of 1.6 g/cm3. At last, from the graph of the relationship between the logarithm of swelling pressure and initial dry density, it can be seen that the relationship of ln(Pz)-ρd under different initial moisture contents displays a series of approximately paralleled and incremental straight line. And the similar slopes, of these lines demonstrate that the rate of change between swelling pressure and the initial dry density dose not change with the variation of moisture content.

Key words: remolded expansive clay, three-dimensional swelling pressure instrument, vertical swelling pressure, lateral swelling pressure

中图分类号: 

  • TU 443

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[2] 谢 云,陈正汉,孙树国,李 刚,方祥位. 重塑膨胀土的三向膨胀力试验研究[J]. , 2007, 28(8): 1636-1642.
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