碎石–膨润土混合物之压实行为 English Version
Compaction properties of crushed rock - bentonite mixture
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摘要: 核废料处置之缓冲材料系由膨润土或碎石(或硅砂)-膨润土混合材料构成,由粉体压制为高密度块体过程中材料与模具间会产生壁面摩擦力,故求取之压缩曲线无法代表材料真实之压缩行为。进行一系列不同最终长宽比压实试验,利用实验结果拟合求取膨润土Gurnham压缩方程式相关参数,建立膨润土之无摩擦力压缩曲线;此一压缩曲线排除壁面摩擦力且不受材料几何形状之影响,可代表材料真实之压缩行为。针对影响压实行为之各项因素(如应力速率、壁面条件、碎石含量及碎石粒径)进行压实试验,探讨各项因素对摩擦力之影响。Abstract: The buffer material in nuclear waste disposal was made up with pure bentonite or sand-bentonite mixture.The wall friction was induced between the materials and the wall of compaction mold during the compaction process,so it was hard to obtain the relationship between the actual compaction stress and the density of the bentonite block.A series of compaction tests of various L/D ratio were carried out in this study,and the compression equation developed by Gurnham was applied to obtain the friction-free compressive curve of bentonite block.This friction-free compaction curve could eliminate wall friction force and the geometric effect.The effects(stress rate,wall lubrication,crush rock content) that would influence the friction force in compaction procedure were analyzed and discussed.
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Keywords:
- buffer material /
- bentonite /
- compaction /
- wall fraction /
- friction free compressibility curve
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