板块状盐渍土的盐溶和盐胀特性研究

Salt-dissolution and salt-heaving characteristics of plate-like saline soil

基于室内盐溶和盐胀试验,对板块状盐渍土的盐溶和盐胀特性进行研究。试验结果表明:板块状盐渍土属溶陷性土,随着含盐量的增大,溶陷系数增大;盐胀起胀温度随着硫酸钠含量的增加有较大幅度的提前,且最终盐胀力提高很大;随着硫酸钠含量增大,盐胀剧烈区间越接近硫酸钠析出剧烈区间;一定荷载的存在能够抑制盐渍土的盐胀作用。这说明工程实际中若要充分利用板块状盐渍土,必须注意其环境特点并采取相应的处治技术。

The characteristics of salt-dissolution and salt-heaving of plate-like saline soil are systematically studied on the basis of laboratory experiments.The results show that the plate-like saline soil is collapsible soil,and the coefficient of collapsibility increases with the increase of the salinity.The salt-heaving temperature is ahead of time as the sodium sulfate content increases,and finally the salt expansion force has a great increase.As the sodium sulfate content increases,the intensity salt-heaving range is closer to the intensity sodium sulfate precipitation range.The salt-heaving can be restricted by a certain load.All the above shows that in engineering practices of the plate-like saline soil,we must pay attention to the environmental characteristics and take some appropriate treatments.