Compression behaviors of compacted bentonite-sand mixtures as buffer material for HLW disposal

ZHANG Hu-yuan; JIA Ling-yan; ZHOU Lang

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Compression behaviors of compacted bentonite-sand mixtures as buffer material for HLW disposal

更新时间：2026-06-25

- Compression behaviors of compacted bentonite-sand mixtures as buffer material for HLW disposal
- Vol. 34, Issue 6, (2013)
- 作者机构：
  
  兰州大学西部灾害与环境力学教育部重点实验室,兰州,730000
- 作者简介：
- 基金信息：
- DOI：
  CLC： TU411.5
- Online First：14 June 2013，
  
  Published：2013
- 稿件说明：
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ZHANG Hu-yuan, JIA Ling-yan, ZHOU Lang. Compression behaviors of compacted bentonite-sand mixtures as buffer material for HLW disposal[J]. 2013, 34(6).
DOI：

ZHANG Hu-yuan, JIA Ling-yan, ZHOU Lang. Compression behaviors of compacted bentonite-sand mixtures as buffer material for HLW disposal[J]. 2013, 34(6). DOI：

摘要

高放废物处置库中缓冲回填材料需要预先压缩到一定密实度，其压缩特性对处置库的安全设计、施工及运营有重要影响。目前，国内初步考虑将膨润土-砂混合物作为缓冲回填材料的首选。采用WG型单杠杆固结仪，对不同干密度、掺砂率的膨润土-砂混合物进行侧限压缩试验研究。试验结果表明：随着干密度的增大，压缩系数呈二次曲线减小；随着掺砂率的增大，压缩系数呈非线性增大。通过引入有效黏土密度和有效含水率的概念，对不同干密度、掺砂率的膨润土-砂混合物的压缩系数进行解释，并根据试验数据得到了回归的数学模型，试图为缓冲回填材料的配比优化研究提供相关依据。

Abstract

In high-level radioactive waste(HLW) repository

buffer backfilling material should be pre-compacted to a certain density. The compression properties of buffer backfilling material have an important influence on the safety design

construction and operation for geological HLW repository. At present

bentonite-sand mixtures are considered to be the ideal buffer backfilling material in the geological HLW repository in China. the compression properties of bentonite-sand mixtures with different dry densities and sand ratios

whose water content is constant

are performed by WG oedometer. It is found that the compression coefficient a1-2 decreases quadratically with the increase of dry density

but it increases nonlinearly with the increase of sand ratio. Based on the concepts of effective clay density and effective water content

we try to explain the changes of the compression coefficient a1-2 with dry density and sand ratio. The regression analysis model of bentonite-sand mixtures with various dry densities and sand ratios are fitted based on the experimental data

and it hopes that this result can be used to provide a related basis of the optimization of buffer backfilling material.

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School of Civil Engineering and Mechanics, Lanzhou University

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