岩土力学2024，Vol.45Issue(1)：235-244,10.DOI:10.16285/j.rsm.2023.0022
酒精湿化法调配压实膨润土缓冲回填材料含水率研究
Research on the alcohol method to adjust water content of compacted bentonite as buffer/b ackfill material
摘要
Abstract
Compacted bentonite is a crucial material used in high-level waste engineering barriers as a buffer/backfill material.However,the high plasticity of bentonite and uneven distribution of water can result in drying shrinkage of the compacted bentonite,which negatively impacts the quality of buffer/backfill blocks.To address this issue,a new method called the alcohol method has been proposed as an alternative to the traditional water spray method.In the alcohol method,the ethanol content ranges from 5％to 35％,unlike the water spray method.Several factors were considered to evaluate the feasibility of the alcohol method in adjusting the water content of compacted bentonite.These factors included mixing effiiciency,mass loss rate,agglomerate content,strength,shrinkage cracks of compacted samples,drying effiiciency,and expansibility.The results demonstrated that as the ethanol content increased,at the same liquid content the mixing efficiency significantly improved,while the mass loss rate and agglomerate content decreased noticeably.Relationships between agglomerates,dry-shrinkage cracks,and the quality of compacted samples were also observed.The compacted samples produced using the alcohol method exhibited more homogeneous soil density in the compacted direction and significantly reduced dry-shrinkage cracks compared to samples produced using the water spray method.Additionally,the shear strength and expansion characteristics of air-dried samples adjusted by the alcohol method were similar to those adjusted by the water spray method.The alcohol method,along with the findings from this study,provides valuable insights for the production of buffer/backfill materials in high-level waste disposal.关键词
压实膨润土/缓冲回填材料/酒精湿化法/含水率/团聚体Key words
bentonite/buffer/backfill material/alcohol method/water content/agglomerates分类
建筑与水利引用本文复制引用
彭宇,张虎元,周光平,谭煜..酒精湿化法调配压实膨润土缓冲回填材料含水率研究[J].岩土力学,2024,45(1):235-244,10.基金项目
国家自然科学基金面上项目(No.41972265).This work was supported by the General Program of National Natural Science Foundation of China(41972265). （No.41972265）
