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September 15, 2026Journal of Engineering and Applied ScienceOpen Access

Construction sequence optimization for diaphragm wall obstruction removal using a horizontal full-rotation drilling rig

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Authors

SJShenghua JiangXDXifei DengHCHaibing Cai

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Overview

Finite element modeling reveals reduced structural deformation using horizontal full-rotation drilling for diaphragm wall removal, indicating safer tunneling beneath operating metro stations.

Key Points

  • To evaluate and optimize the construction sequence for removing diaphragm wall obstructions beneath an existing metro station using a horizontal full-rotation drilling rig.
  • Constructed a three-dimensional finite element model in Midas GTS NX to simulate ground settlement and structure deformation during obstacle removal, validated against field monitoring data.
  • Compared structural deformation patterns between direct shield tunnel cutting and staged cutting using a horizontal full-rotation drilling rig.
  • Analyzed the effects of single-row sequencing (top-down versus bottom-up) and multi-row sequencing configurations, including interval group construction.
  • Using the horizontal full-rotation drilling rig reduced maximum station deformation from 3.6 mm to 2.1 mm and diaphragm wall deformation from 3.9 mm to 2.7 mm compared to direct shield cutting.
  • Within a single obstruction-removal row, bottom-up excavation resulted in smaller retaining pile settlement (2.4 mm) and horizontal displacement (0.8 mm) compared to top-down excavation.
  • Among multi-row schemes, interval group construction yielded the lowest retaining pile settlement, retaining pile horizontal displacement, diaphragm wall deformation, and soil settlement.

Cite This Study

Jiang et al. (2026) studied this question.

synapsesocial.com/papers/6aa9134b9013453be30a112dhttps://doi.org/10.1186/s44147-026-01211-3
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