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等应力和等孔隙比状态下的土-水特征曲线

邹维列, 王协群, 罗方德, 张俊峰, 叶云雪, 胡中威

邹维列, 王协群, 罗方德, 张俊峰, 叶云雪, 胡中威. 等应力和等孔隙比状态下的土-水特征曲线[J]. 岩土工程学报, 2017, 39(9): 1711-1717. DOI: 10.11779/CJGE201709020
引用本文: 邹维列, 王协群, 罗方德, 张俊峰, 叶云雪, 胡中威. 等应力和等孔隙比状态下的土-水特征曲线[J]. 岩土工程学报, 2017, 39(9): 1711-1717. DOI: 10.11779/CJGE201709020
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ZOU Wei-lie, WANG Xie-qun, LUO Fang-de, ZHANG Jun-feng, YE Yun-xue, HU Zhong-wei. Experimental study on SWCCs under equal stress and equal void ratio states[J]. Chinese Journal of Geotechnical Engineering, 2017, 39(9): 1711-1717. DOI: 10.11779/CJGE201709020
Citation: ZOU Wei-lie, WANG Xie-qun, LUO Fang-de, ZHANG Jun-feng, YE Yun-xue, HU Zhong-wei. Experimental study on SWCCs under equal stress and equal void ratio states[J]. Chinese Journal of Geotechnical Engineering, 2017, 39(9): 1711-1717. DOI: 10.11779/CJGE201709020
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等应力和等孔隙比状态下的土-水特征曲线  English Version

  • 1. 武汉大学土木建筑工程学院,湖北 武汉 430072;
    2. 武汉理工大学土木工程与建筑学院,湖北 武汉 430070;
    3. 武汉建工集团股份有限公司,湖北 武汉 430023;
    4. 碧桂园房地产开发集团有限公司,广东 佛山 528312

基金项目: 国家自然科学基金项目（51479148）; 防灾减灾湖北省重点实验室项目（三峡大学）（2016KJZ03）; 中央高校基本业务费专项资金项目（2042016kf1117）
详细信息
    作者简介:

    邹维列(1969- ),男,教授,博士生导师,主要从事非饱和土特性、土工合成材料应用原理、道路中的岩土工程问题等方面的教学和科研工作。E-mail: zwilliam@126.com。

    通讯作者:

    王协群，E-mail：xqscwang@126.com

  • 中图分类号: TU411

Experimental study on SWCCs under equal stress and equal void ratio states

  • 1. School of Civil Engineering, Wuhan University, Wuhan 430072, China;
    2. School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan 430072, China;
    3. Wuhan Construction Engineering Group Co., Ltd., Wuhan 430023, China;
    4. Country Garden Real Estate Development Co., Ltd., Foshan 528312, China

摘要

    摘要
  • 摘要: 有研究结果表明,孔隙比是影响土-水特征曲线（SWCC）的直接因素,而应力状态是通过孔隙比影响SWCC的间接因素。然而相关文献中关于孔隙比对SWCC影响的试验研究,一般只控制了试样的初始孔隙比相同或者不同,而在SWCC试验过程中对试样的孔隙比并没有加以控制。为了深化对孔隙比和应力状态对SWCC影响的认识,以山东东营黏土为研究对象,采用应力相关土水特征曲线仪,对试样沿预定路径进行单向压缩或单向压缩-回弹以后,控制竖向应力或孔隙比在脱—吸湿SWCC试验过程中保持不变。结果表明：在本次吸力范围内（未超过400 kPa）的脱湿—吸湿过程中,即使竖向应力相同（等应力状态）,只要孔隙比不同,则SWCC就不同;但只要保持试验过程中试样孔隙比不变（等孔隙比状态）,则竖向应力的变化对SWCC几乎没有影响。等孔隙比状态下,即使竖向应力不同,但试样的进气值相近,脱/吸湿速率也几乎保持一致;等应力状态下,进气值随着孔隙比的增大而减小,脱—吸湿SWCC的滞回度和滞回圈面积随孔隙比增加而增大。研究结果对于建立SWCC模型时,如何选取模型参数具有理论指导意义。
    Abstract: The existing laboratory test results in the literatures show that the void ratio is a direct factor affecting the soil-water characteristic curves (SWCCs), whereas the stress state is an indirect factor affecting SWCC, via void ratio. However, in the experimental investigations on the influence of void ratio on SWCCs in the literatures, only the initial void ratios of samples are controlled to keep the same or different, but the void ratios of samples during the SWCC tests are not controlled. In the present experimental study, the vertical stress and void ratio of samples after the unidirectional compression or compression-rebound along the scheduled paths are controlled to keep the same during the drying-wetting SWCC tests by means of a stress-dependent SWCC (SDSWCC) apparatus. The test results indicate that even if the vertical stress is identical (equal stress state), the SWCCs are different as long as the void ratio is different during the drying-wetting SWCC tests. As long as the void ratios of samples are consistent (i.e., equal void ratio state) during the drying-wetting SWCC tests, the change of vertical stress has little effect on SWCCs. Under an equal void ratio state, the drying/wetting rates and air-entry values (AEVs) of the samples are almost the same even if the applied vertical stresses are different. Under an equal stress state, the AEVs of samples decrease with the increasing void ratios of samples, and both hysteresis degree and area of hysteresis loop increase with the increasing void ratio of samples. This study provides valuable reference for one to choose the parameters for a SWCC model.
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  • 收稿日期:  2016-05-31
  • 发布日期:  2017-09-24

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