摘要
干湿交替环境下,膨胀土具有反复湿胀干缩变形的特性,容易引起工程建筑物的变形破坏。以南宁地区的击实膨胀土为研究对象,通过室内试验揭示膨胀土在干湿交替环境中的变形规律,探讨了体积变形参数、初始切线模量与循环次数的关系,并对试样绝对残余体变率与初始切线模量的关系进行了分析。研究结果表明:试样的绝对残余体变率随干湿循环次数的增加而递增,但相对残余体变率却逐渐减小,体积变形量稳定时所需循环次数均随含水率变化幅度的增加而递减。
Expansive soil presents a repeated swelling-shrinking deformation in the alternation of wet-dry environment , which easily leads to the deformation damages of the engineering constructions .Indoor cyclic wetting-drying tests were conducted on the compacted expansive soil from Nanning area in order to study the deformation of expansive soil in alter-ation of wet-dry environment .Then ,the relationships between the deformation parameters ,initialization tangent modulus and cycle numbers were analyzed .In addition ,the relationship between the absolute residual volume change rate and ini-tial tangent modulus of soil specimen was discussed .The results showed that the absolute residual volume change rate of soil specimen increased along with the increase of the wetting-drying cycles ,but the relative residual volume change rate decreased .The number of the cycles for the variation volume to reach a constant state reduced with the increase of the water content .
出处
《水利与建筑工程学报》
2015年第3期72-76,共5页
Journal of Water Resources and Architectural Engineering
基金
国家自然科学基金(41272358)
广西自然科学基金(2013GXNSFBA019233)
广西教育厅项目(2013LX051)
广西矿冶与环境科学实验中心重点项目(KH2013ZD005)
关键词
干湿交替
膨胀土
变形试验
残余体变率
初始切线模量
alternation of wet-dry environment
expansive soil
deformation test
residual volume change rate
initial tangent modulus
