Volume 39 Issue 4
Aug.  2025
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Dong Jiaoshe. Application of residual pile length detection method in shield or pipe-jacking area[J]. GEOTECHNICAL ENGINEERING TECHNIQUE, 2025, 39(4): 576-582. doi: 10.20265/j.cnki.issn.1007-2993.2024-0256
Citation: Dong Jiaoshe. Application of residual pile length detection method in shield or pipe-jacking area[J]. GEOTECHNICAL ENGINEERING TECHNIQUE, 2025, 39(4): 576-582. doi: 10.20265/j.cnki.issn.1007-2993.2024-0256

Application of residual pile length detection method in shield or pipe-jacking area

doi: 10.20265/j.cnki.issn.1007-2993.2024-0256
  • Received Date: 2024-06-09
  • Accepted Date: 2024-10-29
  • Rev Recd Date: 2024-09-04
  • Publish Date: 2025-08-08
  • Affected by the complex site conditions and the limitations of geophysical prospecting methods, the applicable detection methods for the length of residual foundation piles are limited within the influence range of shield tunnels or pipe-jacking pipelines in urban areas. Practice and research have proved that for concrete piles (reinforcement), the borehole magnetic gradient method combined with the low-strain elastic wave method is effective; For steel pipe piles or steel sheet piles, the effect of the borehole magnetic gradient method is good. The borehole magnetic gradient method has the characteristics of high precision, fast speed, and strong environmental adaptability. It is easy to damage the underground pipeline by using the conventional drilling method. The drilling technology using a new type of plastic drill bit is proposed, which can better solve the problem of difficult hole formation in the dense area of underground pipeline, and provide references for detecting the pile length of foundation pile by this method.

     

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