Theoretical Equations on Hydraulic Conductivities of Bentonite-Based Buffer and Backfill for Underground Disposal of Radioactive Wastes
Theoretical Equations on Hydraulic Conductivities of Bentonite-Based Buffer and Backfill for Underground Disposal of Radioactive Wastes
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DOI：
10.1061/(asce)1090-0241(2008)134:4(497
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发表时间：
2008-04
影响因子：
3.9
通讯作者：
H. Komine
中科院分区：
文献类型：
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作者：
H. Komine
由于压实膨润土和砂-膨润土混合物具有极低的渗透性，因此被寻求作为高放射性废物处理设施的缓冲和回填材料。为了确定缓冲和回填材料的干密度和砂-膨润土质量比等规格，我们必须定量评估材料的水力导电性。本研究提出了新的理论公式来评估压实膨润土和砂-膨润土混合物的水力导电性。考虑蒙脱土的膨胀特性，提出了两层蒙脱土平行板层间水流速的新方程。在此基础上，结合以往蒙脱土在膨润土中的溶胀特性计算公式，提出了一种压实型膨润土和砂-膨润土混合物的导流系数预测方法。通过对预测结果与实际结果的比较，阐明了该方法的适用性。
Compacted bentonite and sand-bentonite mixtures are sought as buffer and backfill materials for high-level radioactive waste disposal facilities because they have very low permeability. To establish specifications such as the dry density and sand-bentonite mass ratio for buffer and backfill materials, we must quantitatively evaluate a material’s hydraulic conductivities. This study presents theoretical new equations for evaluating the hydraulic conductivity of compacted bentonites and sand-bentonite mixtures. New equations are proposed for evaluating the flow velocity of interlayer water between two montmorillonite parallel-plate layers considering the swelling behaviors of montmorillonite. Furthermore, a prediction method for hydraulic conductivity of compacted bentonite and sand-bentonite mixtures is presented by combining new equations with previous equations for evaluating swelling behavior of montmorillonite in bentonite. The applicability of this method is clarified by comparing predicted results wi...