渗透力概念的力学分析及广义化探讨

发布时间：2018-05-28 16:38

本文选题：渗透力 + 水力梯度　；参考：《岩土工程学报》2017年11期

【摘要】：渗透力是土力学中重要而艰深的概念之一。在分析渗透力现有成果基础上,首先辨析提出了相关的水力梯度定义和Darcy定律表述之间的协调性问题,从而明确了传统渗透力表述式中水力梯度的协调性定义方法;然后,基于力学机理较严谨的Biot固结理论并引入体力、广义有效应力原理和总渗流势方程等,分析提出适用于广义多孔介质(含土体)的广义渗透力的一种定义,即广义渗透力在力学上是广义有效应力系数张量与总渗流势梯度的点积,这区别于传统假说。在Terzaghi有效应力方程适用的范围内,广义渗透力可以退化为总渗流势梯度这一常见形式。还探讨了渗透力的其他力学性质,以及考虑渗流速度影响的广义渗透力改进途径。所得结论有助于拓展对渗透力概念的认识。
[Abstract]:Permeability is one of the most important and difficult concepts in soil mechanics. On the basis of analyzing the existing results of permeability, this paper first analyzes the consistency between the definition of hydraulic gradient and the expression of Darcy's law, and then defines the method of consistency of hydraulic gradient in the traditional expression of permeability. Based on the Biot consolidation theory with strict mechanics mechanism and the introduction of physical force, generalized effective stress principle and total seepage potential equation, a definition of generalized permeability force suitable for generalized porous media (including soil) is proposed. That is, the generalized permeability is the point product of the generalized effective stress coefficient Zhang Liang and the gradient of the total seepage potential in mechanics, which is different from the traditional hypothesis. Within the applicable range of Terzaghi effective stress equation, the generalized permeability can degenerate into the common form of total seepage potential gradient. The other mechanical properties of permeability and the improvement of generalized permeability considering the influence of seepage velocity are also discussed. The conclusions are helpful to broaden the understanding of the concept of permeability.
【作者单位】：北京交通大学土木建筑工程学院;陕西省公路桥梁与隧道重点实验室;
【基金】：国家自然科学基金项目(51278028,41172221) 中央高校基本科研业务费专项资金项目(2014JBM087,310821161119)
【分类号】：TU43

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