Abstract The mechanical and hydrological characteristics of compacted sand bentonite mixtures with bentonite contents ranging from 5 to 40% were investigated in the laboratory in order to assess their use as a waste isolation material and to select an optimum sand bentonite mixture. Laboratory tests included compaction, compaction permeability, unconfined compression and direct shear tests which led to a recommendation to select a mixture with a bentonite content of 30% for the isolation of underground geological waste disposal repositories. This study complements the previous studies of the authors of this manuscript by determining the mechanical and hydrological properties of sand bentonite mixtures that possess bentonite contents > 30% to determine the geotechnical properties (i.e., unconfined compressive strength, Young's modulus, cohesion and angle of internal friction) and the mechanical behavior of these relatively high levels of bentonite mixtures for the first time in the literature.

中文翻译：

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砂膨润土混合物作为井筒/钻孔密封材料的评价

摘要 在实验室中研究了膨润土含量为 5% 至 40% 的压实砂膨润土混合物的力学和水文特性，以评估其作为废物隔离材料的用途并选择最佳砂膨润土混合物。实验室测试包括压实、压实渗透性、无侧限压缩和直接剪切测试，因此建议选择膨润土含量为 30% 的混合物用于隔离地下地质废物处置库。本研究通过确定膨润土含量 > 30% 的砂膨润土混合物的机械和水文特性来确定岩土特性（即无侧限抗压强度、杨氏模量、