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

doi:10.11779/CJGE201504023

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摘要为了摸清硫酸盐渍土在降温过程中产生冰晶和引起盐胀的剧烈反应期内的体积变化规律,假定土体中芒硝与冰晶独立存在,并认为土体体积变化由三部分体积增加和三部分体积减少引起,根据溶质守恒定律,推求了考虑盐胀和冻胀综合影响下硫酸盐渍土的体积变化关系式,发现剧烈反应期内土体体积变化主要由原始孔隙率n、降温前后未冻水体积含量θ_u1和θ_u2与降温前后的硫酸钠溶解度r₁和r₂所决定。利用自行研制的恒温冷浴土壤试验系统,观测了人工掺配硫酸盐渍土在降温过程中的体积变化;采用冻结温度试验确定了土样冻结过程中的未冻水含量,并引入未结晶水含量的概念,计算了土样降温过程中的累计盐（冻）胀率,通过分析比较土样体积变化率实测值和计算值,验证了关系式的合理性和适用性。

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	牛玺荣
	高江平

关键词 ：硫酸盐渍土, 盐胀, 冻胀, 溶质守恒, 定量关系

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 ratio n, unfrozen water content θ_u1 and θ_u2 before and after being cooled, and solubility r₁ 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.

Key words： sulphate saline soil salt expansion frost heave solute conservation quantitative expression

收稿日期: 2014-05-30

基金资助:国家自然科学基金项目（50578015）; 西部交通建设科技项目（20033187950,20033187951）

作者简介: 牛玺荣(1976- ),男,山西高平人,博士,在站博士后,副教授,高级工程师,主要从事道路岩土工程与特殊地区筑路技术方面的教学与研究工作。E-mail: niuxirong@sxu.edu.cn。

引用本文:

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, 37(4): 755-760. NIU Xi-rong, GAO Jiang-ping. Expression for volume change of sulphate saline soil considering salt expansion and frost heave. Chinese J. Geot. Eng., 2015, 37(4): 755-760.

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http://manu31.magtech.com.cn/Jwk_ytgcxb/CN/10.11779/CJGE201504023 或 http://manu31.magtech.com.cn/Jwk_ytgcxb/CN/Y2015/V37/I4/755

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