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<p>Research into protective measures for groundwater and vegetation under tunnel excavation has mainly focused on grouting methods around the tunnel, with little attention given to viable external measures such as constructing cut-off walls. This study proposed a block calculation method for the analytical solution of groundwater level with a finite depth cut-off wall, based on the analytical solution of groundwater level with an infinite depth cut-off wall. A design method for the cut-off wall is proposed under the tunnel excavation and vegetation protection. The results show that only when the depth of the cut-off wall exceeds the groundwater level can it provide a cut-off effect, and the small permeability can increase the cut-off effect. The proposed design method for cut-off walls was applied under various conditions and demonstrated excellent applicability in the context of groundwater and vegetation protection (at least 41% of the vegetation was protected from water shortage).</p>

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Design of Cut-off Wall for Groundwater and Vegetation Protection during Tunnel Excavation in High Groundwater Level Areas

  • 期刊论文

  • 发表日期：

    2025年12月10日

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  • Jie Hou,
  • Fenglei Han,
  • Cuicui Ji,
  • Yuanming Lai,
  • Yuanfu Zhou

摘要

Research into protective measures for groundwater and vegetation under tunnel excavation has mainly focused on grouting methods around the tunnel, with little attention given to viable external measures such as constructing cut-off walls. This study proposed a block calculation method for the analytical solution of groundwater level with a finite depth cut-off wall, based on the analytical solution of groundwater level with an infinite depth cut-off wall. A design method for the cut-off wall is proposed under the tunnel excavation and vegetation protection. The results show that only when the depth of the cut-off wall exceeds the groundwater level can it provide a cut-off effect, and the small permeability can increase the cut-off effect. The proposed design method for cut-off walls was applied under various conditions and demonstrated excellent applicability in the context of groundwater and vegetation protection (at least 41% of the vegetation was protected from water shortage).