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高放废物(HLW)深地质处置中,在膨润土中添加一定比例的石英砂能优化缓冲/回填材料的性能。利用水汽平衡法,对高庙子压实膨润土-砂混合物在不同温度、掺砂率和干密度条件下的土-水特征曲线(SWCCs)进行试验研究,分析温度、掺砂率与干密度对混合物土-水特征曲线的影响。试验结果表明,随着温度升高,混合物的持水能力明显下降;在试验控制吸力范围内,低吸力段掺砂率对土-水特征曲线影响明显,高吸力段掺砂率对混合物土-水特征曲线的影响逐渐降低;干密度对混合物的土-水特征曲线基本没有影响。根据试验数据建立了不同温度和掺砂率条件下膨润土-砂缓冲/回填材料土-水特征曲线的经验公式,可用来预测不同温度和掺砂率条件下的膨润土-砂混合型缓冲/回填材料土-水特征曲线。
In HLW deep geological disposal, the addition of a proportion of quartz sand to bentonite optimizes the performance of the buffer / backfill material. The soil-water characteristic curves (SWCCs) of Gaomiao Zi-compacted bentonite-sand mixture under different temperature, sand mixing rate and dry density were studied by using water vapor balance method. The influences of temperature, sand content and dry density Effect of mixture soil-water characteristic curve. The experimental results show that with the increase of temperature, the water holding capacity of the mixture decreases obviously. Within the controllable suction range, the effect of sand mixing rate on the soil-water characteristic curve is obvious. The effect of water characteristic curve is gradually reduced; dry density has no effect on the soil-water characteristic curve of the mixture. The empirical formula of soil-water characteristic curve of bentonite-sand buffer / backfill material under different temperature and sand content was established based on the experimental data, which can be used to predict the bentonite-sand buffer / backfill material under different temperature and sand content Soil - water characteristic curve.