Fluid flow and mass transport properties in geological disposal of high-level radioactive waste considering fracture networks

MA Guowei; XU Man; CHEN Yun; LI Tuo; WANG Huidong

doi:10.11835/j.issn.2096-6717.2021.271

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Fluid flow and mass transport properties in geological disposal of high-level radioactive waste considering fracture networks

Civil Engineering | 更新时间：2023-03-07

- Fluid flow and mass transport properties in geological disposal of high-level radioactive waste considering fracture networks
- Journal of Civil and Environmental Engineering Vol. 45, Issue 2, Pages: 39-51(2023)
- 作者机构：
  
  河北工业大学土木与交通学院，天津 300401
- 作者简介：
  
  MA Guowei (1968- ), professor, doctorial supervisor, main research interests: geomechanics and deep underground engineering, E-mail: guowei.ma@hebut.edu.cn.
  CHEN Yun （corresponding author）， PhD， associate professor， E-mail： cycup2010@outlook.com.
- 基金信息：
- DOI：10.11835/j.issn.2096-6717.2021.271
  CLC： TU452
- Received：22 September 2021，
  
  Published：25 April 2023
- 稿件说明：
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MA Guowei, XU Man, CHEN Yun, et al. Fluid flow and mass transport properties in geological disposal of high-level radioactive waste considering fracture networks[J]. Journal of Civil and Environmental Engineering, 2023, 45(2): 39-51.
DOI：

MA Guowei, XU Man, CHEN Yun, et al. Fluid flow and mass transport properties in geological disposal of high-level radioactive waste considering fracture networks[J]. Journal of Civil and Environmental Engineering, 2023, 45(2): 39-51. DOI： 10.11835/j.issn.2096-6717.2021.271.

摘要

裂隙对高放废物深地质处置工程的渗流与传质过程影响显著。基于统一管网法（UPM），考虑裂隙网络粗糙特性及吸附与衰变因素，研究裂隙岩体核素迁移机制，并针对单裂缝岩体溶质运移解析解进行基准测试。基于粗糙裂隙网络水力隙宽等效方法，研究裂隙粗糙度分布、岩石基质吸附能力及裂隙岩体传质特性对核素迁移过程的影响。结果表明，核素运移的突破曲线随着裂隙粗糙度的增大而向长时间方向移动；岩石基质扩散系数和延迟因子的增大极大提高了其对核素迁移的延迟效应；具有较长半衰期的核素易在岩体中积聚成相对较高的浓度，而较低的水力梯度值对相对浓度场分布特性的影响更为显著。

Abstract

Fractures significantly influence fluid flow and mass transport in projects of radioactive waste disposal in deep geological formations. This work investigated the mechanism of nuclide migration in fractured rocks by considering fracture roughness based on a unified pipe-network method (UPM). The processes of adsorption and decay were incorporated into the UPM framework to capture the nuclide migration in a rock mass with rough-walled fracture networks. Benchmark tests were attempted against analytical results of the concentration distribution along a single fracture. An equivalent method to approach the hydraulic fracture aperture in fractured rocks by considering fracture roughness was also demonstrated. The influences of the fracture-roughness distribution

the rock matrix adsorption capacity and the transport properties on the process of nuclide migration were investigated. The results show that the breakthrough curve for the nuclide migration moved toward a longer time with increasing fracture roughness. The increased diffusion coefficient and retardation factor in the rock matrix greatly enhanced the matrix retardation effect on nuclide migration. Furthermore

the nuclide featured longer half-life results in a higher relative nuclide concentration of the domain. A hydraulic gradient with a relatively low value greatly impacted the relative concentration's distribution.

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references

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