含水率单次递减条件下粗颗粒硫酸盐渍土盐胀的室内模拟试验

发布时间：2018-06-05 07:28

本文选题：粗颗粒 + 硫酸盐渍土　；参考：《岩土力学》2017年10期

【摘要】：为探究粗颗粒硫酸盐渍土含水率单次递减条件下的盐胀特性,利用自主设计的多功能盐胀试验装置,开展了粗颗粒硫酸盐渍土盐胀率随4因素(孔隙比、含盐量、温度、初始含水率)变化规律的试验研究。试验结果表明,硫酸盐渍土的体积变化受两种效应的影响:含水率递减引起的干缩效应以及土体中硫酸钠相态变化引起的盐胀效应。含水率单次递减过程中硫酸盐渍土的失水速率与硫酸盐渍土的孔隙比、试样温度、初始含水率呈正相关关系;而与硫酸盐渍土的含盐量呈负相关关系。试验结果中部分试样的盐胀率达到了9%,这表明粗颗粒硫酸盐渍土在含水率单次递减条件下引发的盐胀不容忽略。其研究结果可为西北地区高含盐量的残余型硫酸盐渍土的盐胀性评价提供参考依据。
[Abstract]:In order to investigate the salt swelling characteristics of coarse granular sulphate saline soil under the condition of single decline of water content, the salt expansion rate of coarse particle sulphate soil with four factors (porosity, salt content, temperature) was developed by using the self-designed multi-function salt expansion test device. Experimental study on the variation of initial moisture content. The results show that the volume change of sulphate saline soil is affected by two effects: the dry shrinkage effect caused by decreasing water content and the salt swelling effect caused by the change of sodium sulfate phase in soil. The water loss rate of sulphate saline soil is positively correlated with the pore ratio, sample temperature and initial moisture content, but negatively correlated with the salt content of sulphate saline soil in the process of single decline of water content. The results show that the salt dilatation of coarse granular sulphate soil can not be ignored under the condition of single decline of moisture content. The results can be used as a reference for the evaluation of salt expansion of residual sulphate saline soils with high salt content in Northwest China.
【作者单位】：兰州理工大学岩土工程研究所;兰州石化职业技术学院土木工程系;
【分类号】：TU448

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