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首页> 外文期刊>Applied clay science >Geotechnical characterization and performance assessment of bentonite/sand mixtures for underground waste repository sealing
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Geotechnical characterization and performance assessment of bentonite/sand mixtures for underground waste repository sealing

机译：用于地下废物库密封的膨润土/砂混合物的岩土工程表征和性能评估

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摘要

The objective of this study is to assess the performance of a bentonite/sand mixture for the sealing of underground waste repositories through performing geotechnical laboratory tests such as compaction and flow tests. Swelling, mechanical and shear strength tests along with analyses of seal/rock mechanical interactions of an axially loaded seal in rock have been conducted to recommend an optimum compacted bentonite/sand mixture and a suitable bentonite/sand seal length-to-radius ratio (L/a) as a function of water load. The bentonite used in this study was a natural sodium based non-treated bentonite possessing a high swelling potential and containing at least 90% montmorillonite. The results of the compaction permeameter tests led to a recommendation to select a mixture with a bentonite content of about 30% since it possessed the lowest hydraulic conductivity. Analysis of seal/rock mechanical interaction to reduce the possibility of seal slip was performed as a function of the axial load generated from a water column on the seal for seal length-to-radius ratios (L/a) ranging from 2.0 to 20.
机译：这项研究的目的是通过进行岩土工程实验室测试（例如压实和流动测试）来评估膨润土/沙土混合物用于密封地下废物库的性能。进行了膨胀，机械和抗剪强度测试以及对岩石中轴向加载的密封件的密封件/岩石力学相互作用的分析，以建议最佳的压实膨润土/砂混合物和合适的膨润土/砂子密封件长径比（L） / a）作为水负荷的函数。这项研究中使用的膨润土是一种天然的钠基未经处理的膨润土，具有较高的溶胀潜能，并且至少含有90％的蒙脱土。压实渗透仪测试的结果导致建议选择膨润土含量约为30％的混合物，因为它具有最低的水力传导率。根据从密封件上的水柱产生的轴向载荷（密封长度与半径之比（L / a）为2.0到20）对密封件/岩石机械相互作用进行分析，以减少密封件打滑的可能性。

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