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<p>A theoretical model that reflects the bearing mechanical behavior and deformation characteristics of the pipe roof in this type of engineering is proposed to more accurately grasp the support effect of the pipe roof in ultra-shallow-buried rectangular pipe jacking. Combined with field test results of the deflection deformation of the long pipe roof, the bearing deformation characteristics and support effect of the pipe roof in such projects are systematically investigated. The results showed that: (1) The theoretical model indicates that the stress state of the pipe roof undergoes significant changes with the jacking distance, and as the jacking distance increases, the support effect of the pipe roof gradually weakens. (2) The average error between the measured and theoretical deformation values of the pipe roof during short-distance jacking (&lt; 7.2&#xa0;m) is 10.9%, which falls within a reasonable range and confirms the validity of the theoretical model. (3) In this project, the safe support distance of the pipe roof is 7.2&#xa0;m, and the measured maximum settlement of the pipe roof is -7.27&#xa0;mm at this distance. When this distance is exceeded, the support effect of the pipe roof sharply decreases, and when the support distance exceeds 18&#xa0;m, the support effect on the overburden soil beyond this distance has essentially disappeared. (4) Based on the research results, the support effect and reliability of the pipe roof in such projects are evaluated, which can provide relevant references for the application of pipe roofs in similar projects.</p>

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Evaluation of Deformation Mechanisms and Application Effects of Pipe Roofing in Ultra-Shallow Buried Large-Section Rectangular Pipe Jacking Projects

  • 期刊论文

  • 发表日期：

    2026年3月7日

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  • Li Tang,
  • Zhiqiang Zhang,
  • Jia Wei

摘要

A theoretical model that reflects the bearing mechanical behavior and deformation characteristics of the pipe roof in this type of engineering is proposed to more accurately grasp the support effect of the pipe roof in ultra-shallow-buried rectangular pipe jacking. Combined with field test results of the deflection deformation of the long pipe roof, the bearing deformation characteristics and support effect of the pipe roof in such projects are systematically investigated. The results showed that: (1) The theoretical model indicates that the stress state of the pipe roof undergoes significant changes with the jacking distance, and as the jacking distance increases, the support effect of the pipe roof gradually weakens. (2) The average error between the measured and theoretical deformation values of the pipe roof during short-distance jacking (< 7.2 m) is 10.9%, which falls within a reasonable range and confirms the validity of the theoretical model. (3) In this project, the safe support distance of the pipe roof is 7.2 m, and the measured maximum settlement of the pipe roof is -7.27 mm at this distance. When this distance is exceeded, the support effect of the pipe roof sharply decreases, and when the support distance exceeds 18 m, the support effect on the overburden soil beyond this distance has essentially disappeared. (4) Based on the research results, the support effect and reliability of the pipe roof in such projects are evaluated, which can provide relevant references for the application of pipe roofs in similar projects.