摘要
以高庙子膨润土为研究对象,采用自主研制的多功能膨胀–渗透仪,对不同初始干密度的试样进行不同接缝宽度条件下的膨胀力和渗透试验,并对水化后的膨润土进行水银孔隙率定试验,从微观结构层面分析接缝对膨润土渗透性的影响机制。结果表明:接缝的存在将导致膨润土的膨胀力减小、渗透性增大,从而降低膨润土在处置库中的自封闭性能;在水化过程中,接缝的存在会引起膨润土内部孔隙大小和数量的变化,宏观表现为膨润土渗透性增大。
An experimental study was carried out on the compacted samples of Gaomiaozi（GMZ） bentonite.In order to do this,a self-made multifunctional swell and permeability apparatus was developed in the laboratory.The swelling tests and permeability tests were both performed with respect to different initial dry densities and different widths of joints.After hydration tests,the mercury intrusion porosimetry（MIP） test was carried out to study the influencing mechanism of joints on the permeability of bentonite.The results show that the existence of joints will lead to expansion force of bentonite decreases,the permeability increases and thus reduce the self-sealing performance of bentonite in the engineering barrier of repository.During the hydration processes,the existence of joints will change the size and quantity of pores in bentonite and cause its permeability increase macroscopically.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2012年第3期618-624,共7页
Chinese Journal of Rock Mechanics and Engineering
基金
国家自然科学基金资助项目(40802069)
关键词
土力学
膨润土
接缝
自封闭性能
微观结构
soil mechanics
bentonite
joint
self-sealing behavior
microstructure
