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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 geological disposal of nuclear waste in our country, Gaomiaozi bentonite acts as buffer buffer for the first choice, which plays the role of barrier nuclide migration. High-pressure dense bentonite filled in nuclear waste packaging cans and surrounding rock, hydration in the early and late hydration in free expansion and confined state. Therefore, it is very important to know its hydraulic characteristics under these two constraints. In order to deepen the understanding of the hydraulics properties of bentonite in Gaomiaozi, the soil water characteristic test, the microstructure test and the unsaturated permeability coefficient test were carried out under free expansion and confinement respectively. Finally, based on the above experimental results, the influence of different constraint states on the hydraulics characteristics of Gaomiaozi bentonite was analyzed.