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STUDY OF INTERACTION BETWEEN BUFFER AND BACKFILL MATERIALS IN GEOLOGICAL DISPOSAL REPOSITORIES OF HIGH-LEVEL RADIOACTIVE WASTES IN CHINA
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摘要: 处置巷道中的回填材料作为高放废物地质处置库工程屏障系统的重要组成部分，应具备适当的压缩性以限制处置孔中缓冲材料的向上膨胀。基于我国高放废物地质处置概念，结合候选缓冲材料（高庙子膨润土）和回填材料（膨润土-砂混合料）的相关研究成果，开展缓冲-回填材料相互作用研究。通过理论计算分析回填材料密度对缓冲材料膨胀后密度的影响，确定满足压缩性要求的回填材料密度。Abstract: As an important part of the engineering barrier system of high-level waste geological disposal repositories, the backfill material in the disposal drifts should have appropriate compressibility to limit the upward expansion of buffer materials in disposal holes. Based on the concept of geological disposal of high-level radioactive wastes in China, the interaction between backfill and buffer materials was researched, by combining the relevant research results on candidate buffer materials (Gaomiaozi bentonite) and backfill materials (bentonite-sand mixtures). Based on theoretical calculations, the effect of densities of backfills in disposal drifts on densities of buffers in disposal holes after expansion was analyzed, and the densities of backfills that satisfied compressible requirements were determined.
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