摘要
在我国核废料深地质处置中,高庙子膨润土作为首选缓冲回填材料,起着阻隔核素迁移的作用。高压密膨润土填充于核废料包装罐与围岩之间,在水化初期和水化后期分别处于自由膨胀和侧限状态。因此,认识其在这两种约束状态下的水力学特性是十分重要的。为了加深对高庙子膨润土水力学特性的认识,对其分别进行了自由膨胀和侧限状态下的土水特征测定试验、微观结构测定试验和非饱和渗透系数测定试验。最后在以上试验结果的基础上,分析了约束状态的不同对高庙子膨润土水力学特性的影响。
In the deep disposal of nuclear waste,Gaomiaozi（GMZ） Bentonite is used as the buffer material to retard the nuclide migration.A highly compacted bentonite is filled into the gaps between the nuclear waste canister and the bedrocks as buffer material.The buffer material is in the free swelling condition in the initial period of hydration.After the bentonite swells and contacts with the bedrocks,the buffer material is in confined condition.It is very important to understand the hydraulic behavior of GMZ bentonite in swelling condition and confined condition.The measurement of soil-water characteristic curve,microstructure and unsaturated permeability of GMZ bentonite were conducted in swelling condition and confined condition.With the test results,the effect of restriction condition on the hydraulic behavior of GMZ bentonite was analyzed.
出处
《地下空间与工程学报》
CSCD
北大核心
2010年第3期492-497,共6页
Chinese Journal of Underground Space and Engineering
基金
国家自然科学基金项目(40572161)
关键词
高庙子膨润土
自由膨胀条件
侧限条件
土水特征曲线
微观结构
非饱和渗透系数
GMZ（Gaomiaozi）bentonite
free swelling condition
confined condition
soil water characteristic curve
microstructure
non-saturated permeability
