伊朗德伊高速铁路沿线盐渍土盐胀临界温度试验研究

Experimental Study on Salt Swelling Critical Temperature for Saline Soil Along Deuil High Speed Railway in Iran

为了探究伊朗德黑兰至伊斯法罕高速铁路沿线不同类型盐渍土的盐胀临界温度及其相对应的盐胀量,在德伊高速铁路沿线5个不同类型盐渍土地点取样,依次进行室内试验。结果表明:经历3个温度交替周期即可得出不同类型盐渍土的盐胀临界温度及每个周期内的最大盐胀量;黏性土类细粒盐渍土盐胀临界温度高于其他类型盐渍土;不同类型盐渍土盐胀临界温度相差0~0.8℃;随着温度交替周期的增长,盐渍土的盐胀量逐渐增大,但盐渍土整体温度呈下降趋势,并且温度变化具有明显的滞后性。

In order to study salt swelling critical temperature and the corresponding salt swelling for different types of saline soil along Tehran to Isfahan high speed railway in Iran,the sampling in 5 different types of saline soil points was made along deuil high speed railway and the indoor tests were carried out in turn.The results show that the salt swelling critical temperature and the maximum salt swelling within each cycle for different types of saline soil can be obtained through 3 temperature alternate cycles,the salt swelling critical temperature of clay soil f ine saline soil is higher than that of other types of saline soil,the difference among the salt swelling critical temperatures for different types of saline soil is 0~0.8℃,the salt expansion of the saline soil increases gradually but the whole temperature of the saline soil decreases with the increase of the temperature alternate period,and the change of temperature has obvious hysteresis quality.