摘要
利用常规的渗透仪和恒温恒湿箱对贵州玄武岩残积土进行了干湿循环下的渗透试验,探讨了玄武岩残积土的渗透系数与循环次数的关系。研究结果表明:渗透系数随干密度的增大呈递减趋势,最终趋于稳定,大量裂隙的发育是土样发生渗透的主要通道;由于游离氧化铁的存在,棕红色残积土经一次干湿循环后土样发生破坏,而黄褐色玄武岩残积土,经过7次干湿循环后,渗透系数趋于稳定,且比原来提高2个数量级,但试样没有发生破坏。采用非饱和土力学原理,分析不同干密度、不同循环次数对残积土透水影响的作用机理,为玄武岩地区的工程建设提供数据参考。
The permeability test is undertaken for the basalt residual soil from Guizhou by using the routine permeability apparatus and the constant temperature and humidity box in order to establish the relationship between the permeability coefficient and drying and wetting cycle parameters. It is shown that the permeability coefficient of the basalt residual soil would decrease with the increasing of dry density, and finally reach to a constant state. The large number of cracks are the main channel of soil penetration. Because of free ferric oxide, the brown residual soil is damaged after a drying and wetting cycle. But the permeability coefficient of the basalt residual loessial soil would reach to a constant state after 7 wetting-drying cycles. The study could provide some data and references for the analyses of the influence of different dry density and cycle numbers upon the residual soil＇s permeability mechanism and the construction projects in basalt residual soil areas.
出处
《水利与建筑工程学报》
2011年第5期63-66,104,共5页
Journal of Water Resources and Architectural Engineering
基金
交通部西部交通建设科技项目(2009318802074)
国家自然科学基金资助项目(11072255)
关键词
玄武岩残积土
干湿循环
渗透系数
basalt residual soil
wetting-drying cycle
permeability coefficient
