天然粗颗粒硫酸盐渍土盐胀量剧变界限的试验探讨

Experimental study on the salt expansion mutation of coarse particles saline soil

本文通过一系列室内冻融循环试验,研究了粗颗粒硫酸盐渍土的盐胀特性及其影响因素,明确了粗颗粒硫酸盐渍土盐胀变形剧烈增长的含盐量及孔隙比界限值,这将为工程上判断盐渍土地基盐胀程度提供简便易行的勘察手段。试验结果表明,影响硫酸盐渍土盐胀大小的主要因素为含盐量和孔隙比,且各个因素彼此影响。当含盐量大于1%,且孔隙比小于0.43时盐胀较为剧烈。在冻融循环过程中盐胀量是一个累计叠加的过程,其胀率越来越小,最后逐渐趋于稳定。

Through a series of indoor freezing and thawing cycle tests, the salt expansion characteristics ol coarse sulphate saline soil and influencing factors are studied. The limit of salt content and void ratio which will cause the rapid increase of salt expansion deformation is specified, which will estimate the salt expansion preliminarily. Experimental results show that the salt content and void ratio are the main factors influencing the salt expansion of sulphate saline soil and the factors influence each other. Salt expansion is more intense when the salinity is greater than 1% and the void ratio is less than 0.43. In the process of freezing and thawing cycle, the cumulative amount of salt expansion is a superposition process and the inflation is decreasing and stabilized at a constant finally.