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<p>With the expansion of urban underground space, underpassing existing structures has become a critical engineering challenge. Due to diverse construction methods, a unified theoretical framework remains lacking. This study summarizes key characteristics of underpassing projects through extensive case studies and introduces the concept of foundation underpinning to describe the underpassing construction process systematically. The principles, key concepts, and mechanical characteristics of underpassing underpinning construction are analyzed, along with applicable disturbance control technologies. The proposed framework is validated through its application in the Pingguoyuan Station of Beijing Metro Line 6. The findings indicate that most new stations in underpassing projects are high-risk, primarily adopting multi-division excavation with disturbance control techniques. Underpassing construction is the foundation underpinning for existing structures, leading to the development of the Underpassing Underpinning Method. When the soil thickness is less than 2&#xa0;m, a combined active–passive control approach with foundation underpinning is required. In the Pingguoyuan Station, this method effectively limited additional deformation to 3&#xa0;mm, ensuring the safe operation of the subway. This study enhances the theoretical framework of underpassing construction and provides practical guidance for similar projects.</p>

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Underpassing Underpinning Method with Active–Passive Disturbance Control: A Case Study of High-Risk Metro Station Construction in Shallow Urban Strata

  • 期刊论文

  • 发表日期：

    2025年10月6日

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  • Qiang Xu,
  • Yongquan Zhu,
  • Shengxiang Lei,
  • Zhichun Liu,
  • Wei Zhao

摘要

With the expansion of urban underground space, underpassing existing structures has become a critical engineering challenge. Due to diverse construction methods, a unified theoretical framework remains lacking. This study summarizes key characteristics of underpassing projects through extensive case studies and introduces the concept of foundation underpinning to describe the underpassing construction process systematically. The principles, key concepts, and mechanical characteristics of underpassing underpinning construction are analyzed, along with applicable disturbance control technologies. The proposed framework is validated through its application in the Pingguoyuan Station of Beijing Metro Line 6. The findings indicate that most new stations in underpassing projects are high-risk, primarily adopting multi-division excavation with disturbance control techniques. Underpassing construction is the foundation underpinning for existing structures, leading to the development of the Underpassing Underpinning Method. When the soil thickness is less than 2 m, a combined active–passive control approach with foundation underpinning is required. In the Pingguoyuan Station, this method effectively limited additional deformation to 3 mm, ensuring the safe operation of the subway. This study enhances the theoretical framework of underpassing construction and provides practical guidance for similar projects.