氯盐渍土的工程特性研究  

Study on engineering characteristics of chlorine saline soil

作　　者：张宁霞[1,2] 刘保健[1] 赵丽娅[1] 

机构地区：[1]长安大学公路学院,西安710064 [2]中交第一公路勘察设计研究院有限公司,西安710068

出　　处：《工程勘察》2012年第6期14-17,共4页Geotechnical Investigation & Surveying

摘　　要：对新疆地区的氯盐渍土进行了勘察和室内试验分析,该地区盐渍土的含盐量在2.87%～3.369%,pH值最大为10.42,洗盐前后的颗粒组成有着明显的不同,洗盐前黏粒含量较少。同时,含盐量对盐渍土的塑性指标影响较大,液限和塑限随着含盐量的增大有减小的趋势,含盐量为2%时液限为28.5%、塑限为16.2%;当含盐量增加到8%时,液限和塑限分别降低到24.1%和13.6%。通过剪切试验得出,含水量不变时,抗剪强度随着含盐量的增大先减小后增大,在一定含盐量下,随着含水量的增加而减小。盐渍土的溶陷系数随着初始含水量的增大而减小,随着含盐量的增加而逐渐增大。The investigation and laboratory tests for the chlorine saline soil in Xinjiang are carried out. The results show that the salt content is between 2. 87% and 3. 369% , the pH value is about 10.42, the particle composition is significantly different before and after washing the salt, and the clayey grain content is less before washing the salt. Meanwhile, the salt content in the saline soil is of the great effect on the plasticity index, and the liquid limit and plastic limit decrease with the increasing of the amount of salt content. The liquid limit is about 28.5% and the plastic limit is about 16.2% when the salt content is about 2%. When the salinity increased to 8% , the liquid and plastic limits will reduce to 24.1% and 13.6% respectively. Based on the shear tests, when the water content is constant, the shear strength firstly decreases and then increases as the salt content increases. When the salt content is constant, the shear strength decreases with the increasing of the water content. The coefficient of thaw collapse of the soil will decrease with the increasing of the water content and increase with the increasing of the salt content.

关 键 词：氯盐渍土 含盐量 含水量 抗剪强度 溶陷系数 

分 类 号：TU448[建筑科学—岩土工程]