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<p>This study presents an empirical field investigation of integrated jet grouting strategies applied to the underground section between LG06 and Y11 stations of the Taipei Mass Rapid Transit (MRT) Zhonghe–Wanda Line. The site is characterized by soft silty clay, shallow groundwater, and dense underground utilities, conditions under which conventional diaphragm wall systems were infeasible. Two grouting techniques were implemented and evaluated: standard high-pressure jet grouting (JSG) and large-diameter super high-pressure jet grouting. Standard JSG was used to form retaining piles integrated with H-shaped steel beams, while large-diameter super high-pressure grouting was selectively applied beneath sensitive infrastructure to improve soil uniformity and seepage control. Key construction parameters—including injection pressure (100–220&#xa0;kg/cm<sup>2</sup> for JSG and up to 400&#xa0;kg/cm<sup>2</sup> for super high-pressure grouting), slurry properties, lifting speed, and grout volume—were systematically recorded. Post-construction coring and laboratory tests confirmed that the treated ground consistently achieved unconfined compressive strength exceeding 10&#xa0;kg/cm<sup>2</sup> and permeability coefficients lower than 1 × 10⁻<sup>5</sup>&#xa0;cm/sec, satisfying design requirements for structural stability and groundwater control. Column continuity and environmental performance were also verified through inspection and monitoring. Rather than proposing universally applicable design rules, this study provides quantitative, field-validated evidence on the performance of integrated multi-scale jet grouting systems under extreme urban constraints, offering context-specific performance benchmarks that complement existing laboratory and numerical studies.</p>

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Sustainability-Oriented Grouting Techniques for Soil Improvement and Retaining Pile Installation in Urban MRT Construction

  • 期刊论文

  • 发表日期：

    2026年2月25日

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  • Tai-Yi Liu,
  • Chao-Pang Wang,
  • Shih-Ping Ho,
  • Sung-Fang Yeh,
  • Kai-Chun Ten,
  • Bing-Ci Ciou

摘要

This study presents an empirical field investigation of integrated jet grouting strategies applied to the underground section between LG06 and Y11 stations of the Taipei Mass Rapid Transit (MRT) Zhonghe–Wanda Line. The site is characterized by soft silty clay, shallow groundwater, and dense underground utilities, conditions under which conventional diaphragm wall systems were infeasible. Two grouting techniques were implemented and evaluated: standard high-pressure jet grouting (JSG) and large-diameter super high-pressure jet grouting. Standard JSG was used to form retaining piles integrated with H-shaped steel beams, while large-diameter super high-pressure grouting was selectively applied beneath sensitive infrastructure to improve soil uniformity and seepage control. Key construction parameters—including injection pressure (100–220 kg/cm2 for JSG and up to 400 kg/cm2 for super high-pressure grouting), slurry properties, lifting speed, and grout volume—were systematically recorded. Post-construction coring and laboratory tests confirmed that the treated ground consistently achieved unconfined compressive strength exceeding 10 kg/cm2 and permeability coefficients lower than 1 × 10⁻5 cm/sec, satisfying design requirements for structural stability and groundwater control. Column continuity and environmental performance were also verified through inspection and monitoring. Rather than proposing universally applicable design rules, this study provides quantitative, field-validated evidence on the performance of integrated multi-scale jet grouting systems under extreme urban constraints, offering context-specific performance benchmarks that complement existing laboratory and numerical studies.