砾类硫酸盐渍土单向冻胀试验特性研究  

Laboratory research on characteristics of saline sulfate gravel soil during unidirectional freezing

作　　者：董晓明[1] 谢永利[1] 

机构地区：[1]长安大学公路学院,陕西西安610064

出　　处：《广西大学学报（自然科学版）》2011年第4期582-586,共5页Journal of Guangxi University（Natural Science Edition）

基　　金：交通部西部交通建设科研项目(2009310000003)

摘　　要：为了研究砾类硫酸盐渍土在不同条件下单向降温的盐胀特性,采用均匀设计法的室内模拟试验,在不同含盐量、不同上覆荷载、不同初始干密度和不同含水率的条件下,对12组不同工况的盐胀特性进行对比分析,结果表明,砾类硫酸盐渍土盐胀变形的主要控制因素为含盐量、初始干密度和含水率;上覆荷载对其盐胀变形有很强的抑制作用;并通过试验数据运用非线性回归分析法得出了砾类硫酸盐渍土的四因素盐胀率的计算公式。其结论对该类盐渍土的盐胀和减少盐渍土病害提供了理论依据。In order to study salinity expansion of saline sulfate gravel soils due to unidirectional temperature drop,a uniform indoor simulation method was used to analyze the saline expansion characteristics of 12 groups of samples with different saline contents,overlying load,initial dry density,and moisture content.The results show that the main saline expansion and deformation controlling factors for saline sulfate gravel soils include saline content,initial dry density and moisture content.However,overlying load has a strong restraining effect on saline expansion and deformation control properties.According to the laboratory test data,nonlinear regression analysis was applied to come up with a four-factor saline expansion formula for saline sulfate gravel soils.The conclusion reached by this study provide theoritical basis for the saline sulfate gravel soil expansion and reduction of harm of saline soil.

关 键 词：砾类硫酸盐渍土 盐胀特性 室内试验 因素 回归分析 

分 类 号：U416.1[交通运输工程—道路与铁道工程]