Second Canadian Geotechnical Colloquium: Appropriate concepts and technology for unsaturated soils
Second Canadian Geotechnical Colloquium: Appropriate concepts and technology for unsaturated soils
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DOI：
10.1139/t79-011
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发表时间：
1979-02
影响因子：
3.6
通讯作者：
D. Fredlund
中科院分区：
文献类型：
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作者：
D. Fredlund
由于两个主要原因，非饱和土壤的实用科学还没有完全发展起来。首先，缺乏一门有理论基础的合适的科学。其次，缺乏一种适当的技术来使工程实践在经济上可行。本文提出了一些概念，可用于开发适用于非饱和土壤的工程实践。首先描述了非饱和土体的性质以及相应的应力条件。在此基础上提出了与力学性能有关的基本方程。这些问题被应用到诸如土压力、极限平衡和体积变化等实际问题中，并试图证明当土体为非饱和时，饱和土力学必须以何种方式展开。描述非饱和土应力状态需要两个变量(如(σ-UA)和(UA-UW))。从非饱和情况到饱和情况是平稳过渡的，这是由于孔隙空气压力的影响。
A practical science has not been fully developed for unsaturated soils for two main reasons. First, there has been the lack of an appropriate science with a theoretical base. Second, there has been the lack of an appropriate technology to render engineering practice financially viable.This paper presents concepts that can be used to develop an appropriate engineering practice for unsaturated soils. The nature of an unsaturated soil is first described along with the accompanying stress conditions. The basic equations related to mechanical properties are then proposed. These are applied to practical problems such as earth pressure, limiting equilibrium, and volume change.An attempt is made to demonstrate the manner in which saturated soil mechanics must be extended when a soil is unsaturated. Two variables are required to describe the stress state of an unsaturated soil (e.g., (σ – ua) and (ua – uW). There is a smooth transition from the unsaturated case to the saturated case since the pore-air pressure bec...