Application of aqueous film theory to study of unsaturated soil’s suction

ZHAO Ming-hua; LIU Xiao-ping; PENG Wen-xiang

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Application of aqueous film theory to study of unsaturated soil’s suction

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- Application of aqueous film theory to study of unsaturated soil’s suction
- Vol. 28, Issue 7, (2007)
- 作者机构：
  
  湖南大学岩土工程研究所,长沙,410082
- 作者简介：
- 基金信息：
- DOI：
  CLC： TU43
- Online First：13 September 2013，
  
  Published：2007
- 稿件说明：
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ZHAO Ming-hua, LIU Xiao-ping, PENG Wen-xiang. Application of aqueous film theory to study of unsaturated soil’s suction[J]. 2007, 28(7).
DOI：

ZHAO Ming-hua, LIU Xiao-ping, PENG Wen-xiang. Application of aqueous film theory to study of unsaturated soil’s suction[J]. 2007, 28(7). DOI：

摘要

非饱和土中总吸力问题一直是非饱和土土力学研究的一个重要分支。本文引用并引伸了水膜理论，把水膜理论的水膜范围扩展到包括结合水和毛细作用及基质吸力等引起的自由水（重力水）等部分，相应的水膜分离压也包括基质吸力和毛细作用，因此，非饱和土中的总吸力相应地可表示为扩展后的水膜分离压。从广义水膜理论及土性方面分析非饱和土总吸力，探讨了非饱和土中水膜对总吸力的影响，导出了广义非饱和土水膜理论下的总吸力公式，给出了非饱和土总吸力当土颗粒大小不同时与饱和度的关系。理论计算与试验结果吻合较好，表明了广义水膜理论对研究非饱和土总吸力具有一定的指导意义。

Abstract

The problem of the total suction of unsaturated soils is an important branch in the studies of unsaturated soil mechanics. The theory of aqueous film is generally applied to petrochemical and soil sciences. On the basic points

this paper expands the aqueous film scope in the theory to the free water(gravity water) that results from the action of hydrate water

capillary effect and matrix suction. The corresponding disjoining pressure of aqueous films includes matrix suction and capillary action

accordingly; the total suction in unsaturated soils can be expressed as the disjoining pressure of aqueous films. The total suction of unsaturated soils is analyzed in the aspect of their characters using the aqueous film theory; the effect of the aqueous film on the total is then discussed. On this basis

the formula to calculate the total suction is deduced in the significance of the generalized unsaturated soil’s aqueous film theory; and finally

the relationship between the unsaturated soil’s total suction and the saturability when the soil has different sizes is given. The theoretical computation result is well accordant with the real situation

showing that the generalized aqueous theory is of significance to guiding the study of the total suction of unsaturated soils to a certain degree.

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