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<p>in response to the research gap regarding control measures for scenarios where newly-built high-rise building structures closely span over existing tunnels, this paper proposes a new type of control measure called the ‘pile-raft conversion structure.’ This measure is composed of isolation piles, conversion raft, and interlayer soil. Through the collaborative working mechanism of the piles, raft, and soil mass, it achieves effective conversion of overlying loads and active regulation of ground deformation. The results from practical application demonstrate that the control measure has a remarkable effect. The maximum earth pressure at the tunnel top caused by the newly-built underground structure is 65.80&#xa0;kPa, and the maximum settlement increment at the tunnel top is 3.36&#xa0;mm, both meeting the control standards. Furthermore, the influence mechanisms of key parameters, such as the compression modulus of the interlayer soil, the thickness of the conversion raft, and the length -diameter ratio and spacing-diameter ratio of the isolation piles, on the control effect of the measure are systematically explored, aiming to provide references for similar engineering projects. The results indicate that an increase in the compression modulus of the interlayer soil helps reduce the settlement of the conversion raft but leads to an increase in the earth pressure at the tunnel top. An increase in the thickness of the conversion raft will result in greater settlement of both the existing tunnel and the conversion raft; thus, it is not advisable to excessively increase the thickness of the conversion raft. It is advisable to maximize the length-diameter ratio of the isolation piles and minimize the spacing-diameter ratio, thereby reducing the overall stratum settlement and ensuring structural safety.</p>

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Research on control measures for the impact of newly constructed structures crossing over existing tunnels at close range: a case study of the Beijing transportation hub project

  • 期刊论文

  • 发表日期：

    2026年1月28日

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  • Geng Wang,
  • Bowen Zhang,
  • Zhaoping Li,
  • Houting Jiang,
  • Song Duan,
  • Yaojun Jia

摘要

in response to the research gap regarding control measures for scenarios where newly-built high-rise building structures closely span over existing tunnels, this paper proposes a new type of control measure called the ‘pile-raft conversion structure.’ This measure is composed of isolation piles, conversion raft, and interlayer soil. Through the collaborative working mechanism of the piles, raft, and soil mass, it achieves effective conversion of overlying loads and active regulation of ground deformation. The results from practical application demonstrate that the control measure has a remarkable effect. The maximum earth pressure at the tunnel top caused by the newly-built underground structure is 65.80 kPa, and the maximum settlement increment at the tunnel top is 3.36 mm, both meeting the control standards. Furthermore, the influence mechanisms of key parameters, such as the compression modulus of the interlayer soil, the thickness of the conversion raft, and the length -diameter ratio and spacing-diameter ratio of the isolation piles, on the control effect of the measure are systematically explored, aiming to provide references for similar engineering projects. The results indicate that an increase in the compression modulus of the interlayer soil helps reduce the settlement of the conversion raft but leads to an increase in the earth pressure at the tunnel top. An increase in the thickness of the conversion raft will result in greater settlement of both the existing tunnel and the conversion raft; thus, it is not advisable to excessively increase the thickness of the conversion raft. It is advisable to maximize the length-diameter ratio of the isolation piles and minimize the spacing-diameter ratio, thereby reducing the overall stratum settlement and ensuring structural safety.