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制样方法对非饱和土力学特性的影响

高游, 孙德安

高游, 孙德安. 制样方法对非饱和土力学特性的影响[J]. 岩土工程学报, 2016, 38(8): 1529-1534. DOI: 10.11779/CJGE201608022
引用本文: 高游, 孙德安. 制样方法对非饱和土力学特性的影响[J]. 岩土工程学报, 2016, 38(8): 1529-1534. DOI: 10.11779/CJGE201608022
shu
GAO You, SUN De-an. Effect of specimen preparation on mechanical behavior of unsaturated soils[J]. Chinese Journal of Geotechnical Engineering, 2016, 38(8): 1529-1534. DOI: 10.11779/CJGE201608022
Citation: GAO You, SUN De-an. Effect of specimen preparation on mechanical behavior of unsaturated soils[J]. Chinese Journal of Geotechnical Engineering, 2016, 38(8): 1529-1534. DOI: 10.11779/CJGE201608022
shu

制样方法对非饱和土力学特性的影响  English Version

  • 上海大学土木工程系,上海 200444

基金项目: 国家自然科学基金项目（11272194,41402271）
详细信息
    作者简介:

    高 游(1989- ),男,博士研究生,主要从事非饱和土力学的研究。E-mail: gaoyou824@163.com。

    通讯作者:

    孙德安，E-mail：sundean@shu.edu.cn

Effect of specimen preparation on mechanical behavior of unsaturated soils

  • Department of Civil Engineering, Shanghai University, Shanghai 200444, China

摘要

    摘要
  • 摘要: 以一种非膨胀性黏土为试验材料,对孔隙比相近的非饱和压实试样和预固结试样进行一系列等吸力控制下的等向压缩试验和三轴剪切试验,研究了制样方法对非饱和土的压缩特性和剪切特性的影响。由等吸力等向压缩试验结果表明：初始孔隙比相近的预固结样和压实样在等向净应力20 kPa条件下进行等吸力平衡,平衡过程中预固结试样的孔隙比明显减小而压实样的变化不大;其原因是两种试样的初始吸力和土结构存在差异。此外,预固结样和压实样在吸力150 kPa条件下,预固结样的含水率随着等向净应力的增大而减小,而压实样的含水率几乎不变。上述变形特性可用SFG弹塑性模型说明。在净围压和吸力相同条件下对剪切前孔隙比相同的两种试样进行了三轴剪切试验,试验结果表明：在剪切前的密度、剪切时的吸力和净围压相同条件下,预固结样的偏应力-应变曲线和强度明显高于压实试样的曲线和强度。其原因可用两种试样的孔隙尺寸分布不同来解释。
    Abstract: The soil used in this study is one of non-expansive clays. A series of suction-controlled isotropic compression tests and suction-controlled triaxial compression tests are designed with the main objective of investigating the compression and shear behavior of unsaturated soil samples made via either compaction or pre-consolidation method. The isotropic compression test results indicate that the void ratio of pre-consolidation specimen decreases with the increasing suction value under isotropic net stress of 20 kPa, while the void ratio of compacted specimen shows little change during the suction equilibrium process. The reason is that different initial suctions and soil structures exist in two types of specimens. In addition, the pre-consolidated specimen has obvious drainage occurring during imposing suction from the initial suction to 150 kPa under isotropic net stress of 20 kPa, while the compacted specimen shows a little change. These deformation characteristics can be explained by SFG elastoplastic model for unsaturated soils. The triaxial compression test results indicate that the deviatoric stress-strain curve and strength of pre-consolidation specimen are higher than those of compacted specimen under the same suction and net confining pressure during triaxial shearing and almost the same density before the shearing. The reason is the difference in the pore-size distributions of the two kinds of specimens.
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    • 参考文献(13)
  • [1] 陈正汉. 重塑非饱和黄土的变形、强度、屈服和水量变化特性[J]. 岩土工程学报, 1999, 21(1): 82-90. (CHEN Zheng-han. Deformation, strength, yield and moisture change of a remolded unsaturated loess[J]. Chinese Journal of Geotechnical Engineering, 1999, 21(1): 82-90. (in Chinese))
    [2] 孔令伟, 周保春, 白 颢, 等. 荆门非饱和膨胀土的变形与强度特性试验研究[J]. 岩土力学, 2010, 31(10): 3036-3042. (KONG Ling-wei, ZHOU Bao-chun, BAI Hao, et al. Experimental study of deformation and strength characteristics of Jingmen unsaturated expansive soil[J]. Rock and Soil Mechanics, 2010, 31(10): 3036-3042. (in Chinese))
    [3] ESTABRAGH A R, JAVADI H. Effect of suction on volume change and shear behaviour of an overconsolidated unsaturated silty soil[J]. Geomechanics and Engineering, 2012, 4(1): 55-65.
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    [11] 孙德安, 高 游. 不同制样方法非饱和土的持水特性研究[J]. 岩土工程学报, 2015, 37(1): 91-97. (SUN De-an, GAO You. Water retention behaviour of soils with different preparations[J]. Chinese Journal of Geotechnical Engineering, 2015, 37(1): 91-97. (in Chinese))
    [12] SHENG D C,FREDLUND D G, GENS A. A new modeling approach for unsaturated soils using independent stress variables[J]. Canadian Geotechnical Journal, 2008, 45(4): 511-534.
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出版历程
  • 收稿日期:  2015-07-27
  • 发布日期:  2016-08-24

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