Scholarlink

<p>Suspended cutoff walls hold wide application prospects in controlling pollutant migration in contaminated-site aquifers. This study established a three-dimensional numerical coupling calculation model at the field scale to simulate the site seepage and pollutant migration caused by suspended cutoff walls. The effectiveness of this calculation model was verified through a centrifuge model test (80&#xa0;g), and we focused on evaluating the influence of different insertion depths on the service life against pollutant breakthrough at the wall bottom. Results show the suspended cutoff walls cause local flow-around, stronger downstream than upstream, verified by flow velocity, flow net, pore pressure, and pollution plume transient distribution. As the wall insertion depth increases from 12&#xa0;m to 48&#xa0;m, the service life against breakthrough (reached 10% of the source concentration) at the bottom of the downstream wall increases nearly 10-fold, reaching 11.15 years. The containment efficiency increases from 0.09 to 0.23, approximately 2.5 times. The containment efficiency does not increase linearly with the increase of the wall depth. Therefore, in practical engineering applications, it is necessary to comprehensively consider the insertion depth of the suspended cutoff wall and the requirements for controlling the pollution risks of the site.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Investigation of suspended cutoff walls on the seepage and the containment of pollutant migration in saturated sites

  • 期刊论文

  • 发表日期：

    2026年6月30日

查看全文
  • Honghan Dong,
  • Sheng-Jie Wei,
  • Yun-Min Chen,
  • Wenjie Xu

摘要

Suspended cutoff walls hold wide application prospects in controlling pollutant migration in contaminated-site aquifers. This study established a three-dimensional numerical coupling calculation model at the field scale to simulate the site seepage and pollutant migration caused by suspended cutoff walls. The effectiveness of this calculation model was verified through a centrifuge model test (80 g), and we focused on evaluating the influence of different insertion depths on the service life against pollutant breakthrough at the wall bottom. Results show the suspended cutoff walls cause local flow-around, stronger downstream than upstream, verified by flow velocity, flow net, pore pressure, and pollution plume transient distribution. As the wall insertion depth increases from 12 m to 48 m, the service life against breakthrough (reached 10% of the source concentration) at the bottom of the downstream wall increases nearly 10-fold, reaching 11.15 years. The containment efficiency increases from 0.09 to 0.23, approximately 2.5 times. The containment efficiency does not increase linearly with the increase of the wall depth. Therefore, in practical engineering applications, it is necessary to comprehensively consider the insertion depth of the suspended cutoff wall and the requirements for controlling the pollution risks of the site.