： This paper presents the results of laboratory testing on a heavily compacted sand-bentonite mixture. To measure the soil-water retention curve （SWRC） of the mixture over a large range of suction, a pressure plate...： This paper presents the results of laboratory testing on a heavily compacted sand-bentonite mixture. To measure the soil-water retention curve （SWRC） of the mixture over a large range of suction, a pressure plate apparatus and filter papers were used. The obtained SWRC shows that the measurements via the two methods consistently agree with each other. By using a suction-controlled oedometer for unsaturated soils, a series of one-dimensional compression tests were performed on the unsaturated compacted sand-bentonite mixture at different constant suctions. The testing results indicate that the yield stress increases and compression index decreases with the increase of imposed suction. The results also demonstrate that the mixture wetted to saturation and subsequently dried to a certain suction level has a lower yield stress than that wetted directly to the same suction.展开更多
高放废物地质处置库缓冲/回填材料的重要作用之一是传导和散失高放废物衰变热,在膨润土中添加石英砂、石墨、花岗岩岩屑等导热性能较好的添加剂是提高缓冲/回填材料导热性能的主要方法。选用北山花岗岩岩屑为添加剂,与高庙子钠基膨润土G...高放废物地质处置库缓冲/回填材料的重要作用之一是传导和散失高放废物衰变热,在膨润土中添加石英砂、石墨、花岗岩岩屑等导热性能较好的添加剂是提高缓冲/回填材料导热性能的主要方法。选用北山花岗岩岩屑为添加剂,与高庙子钠基膨润土GMZ01组成混合材料,制备不同含水率、不同密度的试样。使用Hot Disk TPS2500s热常数分析仪测定样品的导热系数,分析其与花岗岩岩屑含量、干密度、饱和度等参数的关系,并运用多种混合物热传导模型分析预测导热系数。研究结果表明,花岗岩岩屑能够有效提高缓冲/回填材料的导热性能,混合材料的导热系数分别与其饱和度、气体体积存在线性关系;Maxwell方程能够较好预测北山花岗岩岩屑-膨润土混合材料的导热系数。展开更多
基金Supported by the Innovative Foundation for Graduate Students at Shanghai University of China(SHUCX080168)the National Science Foundationof China(10972130)
文摘： This paper presents the results of laboratory testing on a heavily compacted sand-bentonite mixture. To measure the soil-water retention curve （SWRC） of the mixture over a large range of suction, a pressure plate apparatus and filter papers were used. The obtained SWRC shows that the measurements via the two methods consistently agree with each other. By using a suction-controlled oedometer for unsaturated soils, a series of one-dimensional compression tests were performed on the unsaturated compacted sand-bentonite mixture at different constant suctions. The testing results indicate that the yield stress increases and compression index decreases with the increase of imposed suction. The results also demonstrate that the mixture wetted to saturation and subsequently dried to a certain suction level has a lower yield stress than that wetted directly to the same suction.
文摘高放废物地质处置库缓冲/回填材料的重要作用之一是传导和散失高放废物衰变热,在膨润土中添加石英砂、石墨、花岗岩岩屑等导热性能较好的添加剂是提高缓冲/回填材料导热性能的主要方法。选用北山花岗岩岩屑为添加剂,与高庙子钠基膨润土GMZ01组成混合材料,制备不同含水率、不同密度的试样。使用Hot Disk TPS2500s热常数分析仪测定样品的导热系数,分析其与花岗岩岩屑含量、干密度、饱和度等参数的关系,并运用多种混合物热传导模型分析预测导热系数。研究结果表明,花岗岩岩屑能够有效提高缓冲/回填材料的导热性能,混合材料的导热系数分别与其饱和度、气体体积存在线性关系;Maxwell方程能够较好预测北山花岗岩岩屑-膨润土混合材料的导热系数。
