非饱和土的基质吸力和张力吸力

首先在既往关于非饱和土分类方法的基础上,根据孔隙水弯液面与土颗粒表面的搭接状态,将双开敞非饱和土进一步细分为搭接双开敞非饱和土和不搭接双开敞非饱和土。然后基于热力学原理,提出了另外一个与基质吸力紧密相关而又不同的吸力概念-张力吸力。通过基于水封闭非饱和土的理论计算,得出了张力吸力与基质吸力之间的定量关系,同时利用作者们所提出的等效吸力概念,对比了由基质吸力、张力吸力所产生的等效吸力,从而一方面揭示了张力吸力在非饱和土力学中的重要性,另一方面论证了等效吸力概念的科学性与实用性。

Matric suction and tension suction of unsaturated soils

Based on conventional classification system for unsaturated soils, the double-open unsaturated soil was further divided into the overlapped double-open unsaturated soil and non-overlapped double-open unsaturated soil according to the contact state of meniscus of pore water with the surface of the soil particles. Furthermore, the tension suction, which was closely related with but rather different from the matric suction, was presented on the basis of thermodynamics. Theoretical analysis on quantitative relation between matric suction and tension suction in unsaturated soils with isolated pore water was made. The equivalent suctions respectively corresponding to matric suction and tension suction were determined and compared by using the concept of equivalent suction given by the authors. Through the comparative study, the importance and essence of the tension suction in unsaturated soil mechanics was clearly displayed and the rationality of the concept of equivalent suction was illustrated.