关于基质吸力及几个相关问题的一些思考

Some considerations about the concept of matric suction and questions related to matric suction

基质吸力是非饱和土力学中一个非常重要的概念,也是初学者学习中的一个难点,要把它理解透彻并不容易。本文从表面物理化学的基本公式,亦即 Young-Laplace 公式和 Kelvin 公式出发,对基质吸力概念和与基质吸力有关的若干问题进行了一些思考和初步探讨。研究表明,基质吸力的大小受土的孔径大小的影响;在环境条件下,基质吸力的大小受外界平衡相对深度的影响;土的孔径分布决定了土水特征曲线的特征。

Matric suction is a very important concept in unsaturated soil mechanics, and it is not easy to understand its physics significance. The concept of matric suction and some questions on matric suction are discussed in this paper in term of basic formulae of surface physical chemistry, i.e. Young-Laplace formula and Kelvin formula. The rebuts indicate that the magnitude of matric suction in soils is controlled by aperture size, and it is interrelated with equilibrium relative humidity of the circumstances, and distribution curve of pore size determines the characteristics of the moisture retention curve.