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。
To explore the salt expansion behavior of coarse saline soils containing sulphate under drying, sets of laboratory experiments were conducted to investigate the impact of void ratio, salt content, initial water content and temperature on salt expansion rate. The deformation behavior as water content decreases are the compete of two types of soil-water interactions： shrinkage of soil due to drying, and the swelling of crystallized salts dissolved in pore water. The decreasing rate of water content shows positive correlation with void ratio, temperature and initial water content but negative correlation with the salt content. The test results show that the salt expansion rate of some sample reaches 9%, suggesting that the salt expansion of sulphate saline soil with decreasing water content should not be ignored. It is expected to provide guidance for evaluation on the salt expansion of foundations of residual sulphate saline soil with high salt content in the northwest region.
作者
杨鹏
朱彦鹏
曹亚鹏
米海珍
YANG Peng ZHU Yan-peng CAO Ya-peng MI Hai-zhen(School of Civil Engineering, Lanzhou University of Technology, Lanzhou, Gansu 730050, China School of Civil Engineering, Lanzhou Petrochemical Polytechnic, Lanzhou, Gansu 730060, China)
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2017年第10期2909-2915,共7页
Rock and Soil Mechanics
关键词
粗颗粒
硫酸盐渍土
含水率
递减
盐胀率
coarse particles
sulphate saline soil
water content
descending
salt expansion rate
