Diffusion modeling of bentonite colloids in fractures 
of repository surrounding rocks

CHEN Bao; XIANG Ping; DENG Rong-sheng。

doi:10.16285/j.rsm.2023.0555

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Diffusion modeling of bentonite colloids in fractures of repository surrounding rocks

更新时间：2026-06-25

- Diffusion modeling of bentonite colloids in fractures of repository surrounding rocks
- Vol. 45, Issue 2, Pages: 433-442(2024)
- 作者机构：
  
  1. 同济大学土木工程学院,上海,200092
  2. 同济大学岩土及地下工程教育部重点实验室,上海,200092
- 作者简介：
- 基金信息：
- DOI：10.16285/j.rsm.2023.0555
  CLC： TL941
- Online First：06 February 2024，
  
  Published：2024
- 稿件说明：
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CHEN Bao, XIANG Ping, DENG Rong-sheng。. Diffusion modeling of bentonite colloids in fractures of repository surrounding rocks[J]. 2024, 45(2): 433-442.
DOI：

CHEN Bao, XIANG Ping, DENG Rong-sheng。. Diffusion modeling of bentonite colloids in fractures of repository surrounding rocks[J]. 2024, 45(2): 433-442. DOI： 10.16285/j.rsm.2023.0555.

摘要

为了预测膨润土胶体在甘肃北山高放废物深地质处置库围岩裂隙中的扩散过程，提出了综合考虑膨润土胶体颗粒自重与水化力的扩散模型。研究了钠离子浓度、水化力、胶体颗粒自重以及蒙脱石体积分数对膨润土胶体的扩散过程和扩散系数的影响。研究结果表明：随着钠离子浓度的增加，膨润土胶体的扩散速率与扩散距离均减小。胶体颗粒自重越大，对扩散的影响越大。随着扩散的进行，水化力对扩散的影响逐渐减小，范德华力和扩散双电层力对扩散的影响逐渐增大，膨润土胶体的扩散系数整体表现为先减小后增大。当蒙脱石体积分数较小时（<0.45），随着钠离子浓度的增加，扩散系数整体上逐渐增大；当蒙脱石体积分数较大时（>0.45），钠离子浓度对扩散系数的影响较小。

Abstract

In order to predict the diffusion process of bentonite colloids in the fractures of surrounding rocks in the deep geological repository of high-level radioactive waste in Beishan

Gansu

a diffusion model that integrates the self-weight of bentonite colloid particles and hydration force is proposed. The effects of sodium ion concentration

hydration force

self-weight of colloid particles

and volume fraction of montmorillonite on the diffusion process and diffusion coefficient of bentonite colloids were investigated. The results show that both the diffusion rate and diffusion distance of bentonite colloids decrease with the increase of sodium ion concentration. The greater the self-weight of colloidal particles

the more significant their impact on diffusion. As the diffusion proceeds

the influence of hydration force on diffusion gradually decreases

while the influence of van der Waals force and diffusion double-layer force gradually increases

and in general

the diffusion coefficient of bentonite colloids decreases first and then increases. When the volume fraction of montmorillonite is small ( <0.45)

the diffusion coefficient generally increases with the increase of sodium ion concentration; when the volume fraction of montmorillonite is large ( >0.45)

the influence of sodium ion concentration on the diffusion coefficient is relatively small.

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