粒径对液塑限的影响及影响机理研究  

Discussion on influence of particle size on liquid and plastic limit and its influence mechanism

作　　者：董均贵 季春生[1,2] 

机构地区：[1]桂林理工大学土木与建筑工程学院,广西桂林541004 [2]桂林理工大学广西岩土力学与工程重点实验室,广西桂林541004

出　　处：《工程建设》2017年第3期13-17,共5页Engineering Construction

摘　　要：对三个粒径等级(0~0.075、0.075~0.25、0.25~0.5mm)的土样测定液塑限,研究了粒径大小对液塑限和塑性指数的影响规律,测定了各粒径等级土样的比表面积,且对粒径、比表面积、液塑限三者的关系进行了分析。研究表明,粒径大小通过影响比表面积从而影响液塑限,因而粒径大小对液塑限和塑性指数存在显著影响。建议液塑限试验中考虑土样粒径的影响,提高数据准确性。Three different kinds of soil samples with respective particle diameters （ 0 - 0. 075mm, 0. 075 - 0. 25mm, 0.25 -0.5mm） were served to test the liquid and plastic limit in order to analyze the influence law of particle size on the soil＇s liquid and plastic limit and plasticity index. The specific surface area of soil of each diameter grade were measured, and the relationship among particle diameters, specific surface area and liquid and plastic limits was analyzed. The research shows that particle size has significant effect on liquid and plastic limit and plasticity index, for the particle size affect the liquid plastic limit by affecting the specific surface area. It is suggested that the influence of particle size should be considered during the liquid and plastic limit tests in order to improve data accuracy.

关 键 词：黏土 粒径等级 液塑限 比表面积 影响机理 

分 类 号：TU446[建筑科学—岩土工程]