： 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
基于压力板法和水汽平衡法获取缓冲回填材料土水特征曲线,探讨干密度、掺砂率、温度和溶质浓度对缓冲回填材料土水特征曲线模型的影响。遴选出三参数的张虎元模型和四参数的Fredlund and Xing模型可用于拟合我国高庙子(GMZ)膨润土—砂...基于压力板法和水汽平衡法获取缓冲回填材料土水特征曲线,探讨干密度、掺砂率、温度和溶质浓度对缓冲回填材料土水特征曲线模型的影响。遴选出三参数的张虎元模型和四参数的Fredlund and Xing模型可用于拟合我国高庙子(GMZ)膨润土—砂混合物的土水特征曲线,发现吸力值测试范围对模型选取影响很大。干密度和温度与张虎元模型参数具有很好的相关性,而掺砂率和溶质浓度与模型参数的相关性不明显;干密度与Fredlund and Xing模型参数具有很好的相关性,但掺砂率、温度和溶质溶度与模型参数规律性不明显。根据试验数据拟合出的土水特征曲线模型参数与干密度的经验公式,可用来评估处置库运行期材料密度不断变化时的持水特性。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.
文摘基于压力板法和水汽平衡法获取缓冲回填材料土水特征曲线,探讨干密度、掺砂率、温度和溶质浓度对缓冲回填材料土水特征曲线模型的影响。遴选出三参数的张虎元模型和四参数的Fredlund and Xing模型可用于拟合我国高庙子(GMZ)膨润土—砂混合物的土水特征曲线,发现吸力值测试范围对模型选取影响很大。干密度和温度与张虎元模型参数具有很好的相关性,而掺砂率和溶质浓度与模型参数的相关性不明显;干密度与Fredlund and Xing模型参数具有很好的相关性,但掺砂率、温度和溶质溶度与模型参数规律性不明显。根据试验数据拟合出的土水特征曲线模型参数与干密度的经验公式,可用来评估处置库运行期材料密度不断变化时的持水特性。
