In the multibarrier system of repositories for radioactive and chemical wastes, compacted betonites may be used as barriers. A research programme dealing with the determination of swelling pressures of compacted ben-tonites in contact with high-saline brines was conducted by the Gesellschaft fuer Anlagen- und Reaktorsicherheit GmbH (GRS). Factors found by the GRS team to influence the swelling pressure, besides the density and the microstructure of the compacted bentonite, are the brine composition and the applied hydrostatic pressure. For brines with very high salt content, the existing models are not able to predict or reproduce the experimental results. In order to either extend existing models or to create a new model, the governing parameters for the swelling pressure must be identified. The GRS team has developed new experimental and theoretical approaches for the modeling of swelling pressures.
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机译：在放射性和化学废物储存库的多屏障系统中，压实的膨润土可用作屏障。 Gesellschaft fuer Anlagen- und Reaktorsicherheit GmbH（GRS）进行了一项研究计划，该研究计划用于确定压实膨润土与高盐盐水接触时的溶胀压力。 GRS小组发现的影响溶胀压力的因素，除了压实膨润土的密度和微观结构外，还有盐水成分和施加的静水压力。对于含盐量非常高的盐水，现有模型无法预测或再现实验结果。为了扩展现有模型或创建新模型，必须确定膨胀压力的控制参数。 GRS团队开发了新的实验和理论方法来对膨胀压力进行建模。
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