岩土工程学报Issue(7)：1340-1347,8.DOI:10.11779/CJGE201507023
含氯硫酸盐渍土中硫酸钠结晶量理论分析研究
Theoretical analysis of crystallization of sodium sulphate for sulphate saline soil containing chloride
摘要
Abstract
Concerning the salt heaving within the sulphate salty soil, it is characterized by the crystallization of sodium sulphate. Specifically, the mirabilite (Na2SO4·10H2O) can be precipitated directly from the saturated sodium sulfate solution under some conditions, and the solid volume of salt crystal consequently increases 4.18 times, which finally results in large salt heaving. By collecting experimental data, a static model is established to describe the soluble properties of sodium sulphate, which can be employed to analyze the crystal amount of sodium sulphate in soil. Using this model, the crystallization of sodium sulphate is analyzed and calculated in the cooling process. At the same time, the influences of salt content, water content, concentration of sodium chloride and soil initial temperature on crystallization are discussed. It is found that the critical values for salt content and water content exist for the crystallization of sodium sulphate. The influences of sodium chloride on crystallization of sodium sulphate depend on the coupled effects of salt content and water content. In case of the favorable combination, the crystallization in soil can be restrained by addition of sodium chloride. Contrarily, the sodium chloride can accelerate the crystallization of sodium sulphate. The crystal amount of sodium sulphate depends on the environment temperature seriously, and partial sodium sulfate is crystallized if the initial temperature of soil is low, which reduces the crystallization in further cooling process.关键词
硫酸盐渍土/盐胀/结晶Key words
sulphate saline soil/salt heaving/crystallization分类
建筑与水利引用本文复制引用
赵天宇,张虎元,王志硕,王发旺..含氯硫酸盐渍土中硫酸钠结晶量理论分析研究[J].岩土工程学报,2015,(7):1340-1347,8.基金项目
中国水电顾问集团公司科技项目（2009BK06）；甘肃省交通厅科技项目 （）
