碳酸盐渍土的膨胀特性研究

在新疆省道201线克拉玛依—榆树沟段改建工程段采集土样,通过室内试验研究影响碳酸盐渍土膨胀的主要因素。首先讨论盐渍土地层的自然垂直分布对碳酸盐渍土膨胀特性的影响,得到膨胀率随土样深度的变化发生变化,在25—75cm时膨胀最为明显;考虑到季节变化和温度的影响,进行了碳酸盐渍土的多次冻融循环盐胀特性的研究,发现温度对碳酸盐渍土的膨胀特性影响很小。为了分析含盐量对碳酸盐渍土膨胀特性的影响,室内配制含盐量为0.5%,1.0%,1.5%,2.0%的土样进行膨胀试验,结果表明,含盐量从0.5%增加到2.0%时,其最大膨胀率从10.0%增加到22.5%。

A Study on Expansion Characteristics of Carbonate Saline Soil

Soil samples were taken from Kelamayi to Elm Ditch along provincial road No.201 in Xinjiang Wei Autonomous Region and the main factors influencing the expansion characteristics of carbonate saline soil were studied through laboratory test.The effects of the natural vertical distribution of saline soil layers on the expansion of saline soil were discussed at first.The expansion ratio was found to vary with soil sampling depth and the expansion was most significant between 25 and 75 cm below soil surface.By taking seasonal variation and temperature variation into consideration,the characteristics of saline soil in freeze-thaw cycle studied and temperature was found to have little effect on the expansion characteristics of carbonate saline soil.Expansion test was made with specimens containing salt 0.5%,1.0%,1.5%,and 2.0% in weight to analyze how salt content affects the expansion characteristics of the soil.Results show that the maximum expansion ratio increased from 10.0% to 22.5% as salt content increased from 0.5% to 2.0%.