岩土工程学报Issue(4)：755-760,6.DOI:10.11779/CJGE201504023
综合考虑盐胀和冻胀时硫酸盐渍土体积变化关系式的建立
Expression for volume change of sulphate saline soil considering salt expansion and frost heave
摘要
Abstract
In order to clearly comprehend the volume change law of sulphate saline soil in the intense reaction period of producing ice crystals and causing salt expansion, assuming that the ice crystals and the mirabilite in the soil exist independently and the volume change of soil is composed of three increased parts and three reduced parts, and based on the law of conservation of solute, an expression for the volume change of sulphate saline soil considering salt expansion and frost heave is proposed. It is found that the expression for the volume change in the intense reaction period is largely decided by the initial void ration, unfrozen water contentθu1 andθu2 before and after being cooled, and solubilityr1 and r2 before and after being cooled. The volume of artificial sulphate saline soil samples is investigated using the test system of soil under controlled temperature. The unfrozen water content in the process of freezing is determined by the freezing temperature tests, and the concept of no precipitated water content (NPWC) is given, and the cumulative volume change rate of soil samples during being cooled is calculated. The rationality and applicability of the proposed expression is verified through analysis and comparison between the measured and calculated volume change rates of soil samples.关键词
硫酸盐渍土/盐胀/冻胀/溶质守恒/定量关系Key words
sulphate saline soil/salt expansion/frost heave/solute conservation/quantitative expression分类
建筑与水利引用本文复制引用
牛玺荣,高江平..综合考虑盐胀和冻胀时硫酸盐渍土体积变化关系式的建立[J].岩土工程学报,2015,(4):755-760,6.基金项目
国家自然科学基金项目（50578015）；西部交通建设科技项目 （）
