基于粒间毛细作用探讨界限含水量  

Probe into liquid and plastic limits of fine-grained soils with intergranular capillary

作　　者：周凤玺[1,2] 张海威[1] 张家齐[1] ZHOU Feng-xi 1,2 ,ZHANG Hai-wei 1, ZHANG Jia-qi 1(1. College of Civil Engineering, Lanzhou Univ. of Tech., Lanzhou 730050, China;2. Western Engineering Research Center of Disaster Mitigation in Civil Engineering, the Ministry of Education, Lanzhou Univ. of Tech., Lanzhou 730050, Chin)

机构地区：[1]兰州理工大学土木工程学院,甘肃兰州730050 [2]兰州理工大学西部土木工程防灾减灾教育部工程研究中心,甘肃兰州730050

出　　处：《兰州理工大学学报》2018年第3期115-118,共4页Journal of Lanzhou University of Technology

基　　金：国家自然科学基金(51368038);甘肃省环保厅科研项目(GSEP-2014-23)

摘　　要：土的界限含水量是研究土体物理力学性质及工程分类的重要指标.通过建立两球形颗粒之间的液桥作用模型,采用环形近似的方法给出毛细作用力和液桥体积之间的定量关系,并通过分析毛细作用力随液桥体积的变化规律,从微观角度对土体的塑限和液限进行探讨.参数分析结果表明,毛细作用随着液桥体积的增加先增大后减小;其随液桥体积的变化过程中有2个明显的拐点,即颗粒间的相互作用的状态变化存在界限含水量.本次研究从微观角度解释了土体稠度变化的特性,并为液塑限的概念化提供了理论依据.The limit moisture of soil is an important index in investigation of its physical and mechanical properties and its engineering classification.By establishing the liquid-bridge action model between two spherical particles and applying the circular approximation method,the quantitative relation of capillary force to liquid-bridge volume was given out and the liquid limit and plastic limit of the soil mass were probed by means of analyzing the changing rule of capillary force with liquid bridge volume in the microscopic term.The result of parameter analysis shows that the capillary force will increase at first and then decrease with the liquidbridge volume,and will have two obvious inflexions with it,meaning that there will be moisture limit during state change of interaction between particles.Characteristics of soil mass consistency change will be explained in the microscopic term,offering a theoretical basis for conceptualization of the liquid and plastic limits.

关 键 词：液塑限 毛细作用力 液桥体积 Young-Laplace方程 环形假设 

分 类 号：TU43[建筑科学—岩土工程]