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<p>Pea gravel backfill grouting is essential for the structural integrity of shielded tunnel boring machine (TBM) linings. This study investigates the compressive strength of mixtures of pea gravel and slurry (MPS) through laboratory experiments using both prepared and field-cored samples, focusing on the influence of pea gravel characteristics. Results demonstrate that particle size significantly impacts MPS strength, with 5–10&#xa0;mm pea gravel achieving 15.2% higher strength than 8–12&#xa0;mm particles. Optimizing the content of oversize or undersize particles (COUP) is crucial; introducing up to 2% undersize particles enhances strength by improving gradation, while exceeding this threshold reduces it. Similarly, incorporating rock powder up to 2.5% strengthens MPS by increasing slurry compactness, but higher concentrations introduce voids, leading to an 8.7–12.4% strength reduction. These findings offer practical guidelines for pea gravel selection and MPS strength prediction, contributing to improved quality control in TBM backfill grouting.</p>

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Experimental Study on Strength and Influencing Factors of Pea Gravel–Slurry Mixtures

  • 期刊论文

  • 发表日期：

    2025年4月23日

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  • Yiding Tang,
  • Qiuxiang Huang

摘要

Pea gravel backfill grouting is essential for the structural integrity of shielded tunnel boring machine (TBM) linings. This study investigates the compressive strength of mixtures of pea gravel and slurry (MPS) through laboratory experiments using both prepared and field-cored samples, focusing on the influence of pea gravel characteristics. Results demonstrate that particle size significantly impacts MPS strength, with 5–10 mm pea gravel achieving 15.2% higher strength than 8–12 mm particles. Optimizing the content of oversize or undersize particles (COUP) is crucial; introducing up to 2% undersize particles enhances strength by improving gradation, while exceeding this threshold reduces it. Similarly, incorporating rock powder up to 2.5% strengthens MPS by increasing slurry compactness, but higher concentrations introduce voids, leading to an 8.7–12.4% strength reduction. These findings offer practical guidelines for pea gravel selection and MPS strength prediction, contributing to improved quality control in TBM backfill grouting.