非饱和土的基质吸力和张力吸力  

Matric suction and tension suction of unsaturated soils

作　　者：栾茂田[1] 李顺群[1] 杨庆[1] 

机构地区：[1]大连理工大学海岸和近海工程国家重点实验室

出　　处：《岩土工程学报》2006年第7期863-868,共6页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学基金资助项目(50179006);教育部跨世纪优秀人才培养计划基金资助项目(教技函[1999]2号);辽宁省教育厅科学研究计划资助(2004F105)

摘　　要：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。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.

关 键 词：非饱和土 表面张力 饱和半径 张力吸力 合吸力 等效吸力 

分 类 号：TU43[建筑科学—岩土工程]