渗透力概念的力学分析及广义化探讨

丁洲祥

doi:10.11779/CJGE201711017

渗透力概念的力学分析及广义化探讨 English Version

丁洲祥

1. 北京交通大学土木建筑工程学院,北京 100044;
2. 陕西省公路桥梁与隧道重点实验室,陕西西安 710064

基金项目: 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）

详细信息

作者简介:
丁洲祥(1976-),男,博士,副教授,从事岩土与隧道工程教学科研工作。E-mail:dingzhouxiang@163.com.

中图分类号: TU411.5
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- 文章访问数: 510
- HTML全文浏览量: 8
- PDF下载量: 512
出版历程
- 收稿日期: 2016-06-01
- 发布日期: 2017-11-24

Mechanical fundamentals of seepage force concept and its generalization

DING Zhou-xiang

1. School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China;
2. Shaanxi Provincial Major Laboratory for Highway Bridge & Tunnel, Xi'an 710064, China;

摘要

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。
- 渗透力 /
- 水力梯度 /
- Biot固结理论 /
- 渗流 /
- 广义有效应力原理
Abstract: The seepage force is still one of the most fundamental and controversial concepts in soil mechanics. Based on the literature review, the compatibility between the definition of hydraulic gradient and the mathematical description of Darcy’s law is discussed first, followed by proposing a compatible form of hydraulic gradient definition in the conventional expression for seepage force. By integrating the body force, the general effective stress principle and the total seepage potential equation into the Biot’s consolidation theory, a strict definition of the general seepage force is obtained for various porous media including soils. The general seepage force proposed herein is the dot product of the general effective stress tensor and the total seepage potential gradient, which differs from conventional explanations of seepage force mechanism. Within the scope of Terzaghi's effective stress principle, the general seepage force is reduced to the form of total seepage potential gradient. Other related mechanical properties of seepage force are investigated as well as a further modified formulation for the general seepage force containing seepage velocity. The conclusions may afford profound insight into the concept of seepage force in geotechnical practice.
- seepage force /
- hydraulic gradient /
- Biot’ /
- s consolidation theory /

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