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<p>To promote the application of rectangular pipe jacking (RPJ) in complex environments, introduced here is the world’s first ultra-shallow large-section multiple-cutterhead RPJ project under a high-speed railway line in composite strata. The adaptability of the pipe jacking to the complex environment is evaluated, and the results indicate the following. (1) The continuous jacking of large-section RPJ in ultra-shallow buried weak surrounding rock causes severe geological losses. The maximum surface settlement measured in this project is − 261.9&#xa0;mm, which seriously exceeds the allowable value. (2) The use of D-shaped temporary beams is effective for controlling the transfer of construction disturbances of large-section RPJ to the track. The maximum horizontal and vertical displacements of the D-type temporary beams are − 6.3&#xa0;mm and − 4.3&#xa0;mm, respectively, and combined with train track blocking and speed limiting, this effectively ensures the normal operation of the railway above. (3) Under the various protective measures, the multiple-cutterhead RPJ successfully completed the world’s first jacking in ultra-shallow buried composite strata. This indicates that RPJ is feasible in this type of strata, and further optimization measures are proposed.</p>

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Multiple-Cutterhead Rectangular Pipe Jacking Construction and Disturbance Control Technology in a Complex Environment: A Case Study

  • 期刊论文

  • 发表日期：

    2025年9月22日

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  • Li Tang,
  • Zhiqiang Zhang,
  • Jia Wei

摘要

To promote the application of rectangular pipe jacking (RPJ) in complex environments, introduced here is the world’s first ultra-shallow large-section multiple-cutterhead RPJ project under a high-speed railway line in composite strata. The adaptability of the pipe jacking to the complex environment is evaluated, and the results indicate the following. (1) The continuous jacking of large-section RPJ in ultra-shallow buried weak surrounding rock causes severe geological losses. The maximum surface settlement measured in this project is − 261.9 mm, which seriously exceeds the allowable value. (2) The use of D-shaped temporary beams is effective for controlling the transfer of construction disturbances of large-section RPJ to the track. The maximum horizontal and vertical displacements of the D-type temporary beams are − 6.3 mm and − 4.3 mm, respectively, and combined with train track blocking and speed limiting, this effectively ensures the normal operation of the railway above. (3) Under the various protective measures, the multiple-cutterhead RPJ successfully completed the world’s first jacking in ultra-shallow buried composite strata. This indicates that RPJ is feasible in this type of strata, and further optimization measures are proposed.