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<p>Red clay is susceptible to long-term performance degradation and structural instability. This study employs enzyme-induced carbonate precipitation (EICP) technology with calcium lignosulfonate (CaLS) as the calcium source. The study modifies the particle size distribution of red clay by incorporating quartz sand (QS) and uranium mill tailings (UMTs) with different ratios and grain sizes, thereby enhancing its permeability and solidification effects. The influence of different compaction degrees, curing ages, and cementation solution replenishment methods on unconfined compressive strength (UCS) is also examined. The comparisons of UCS and ultrasonic velocity of unreinforced red clay, EICP-reinforced red clay, and EICP-reinforced remolded red clay show that EICP significantly improves red clay reinforced effect. The UCS and ultrasonic velocity of the reinforced specimens exhibit an exponential relationship. The validation results indicate that the exponential relationship fitting is effective and accurately reflects the relationship between the UCS and ultrasonic velocity of the reinforced soil, providing a new method for predicting and assessing mechanical strength of geotechnical materials.</p>

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Correlation Between Unconfined Compressive Strength and Ultrasonic Velocity in EICP-Reinforced Red Clay

  • 期刊论文

  • 发表日期：

    2025年12月6日

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  • Changshou Hong,
  • Fubing Li,
  • Fuliang Jiang,
  • Chengyu Zhang,
  • Zhien Zou,
  • Lingling Wu,
  • Zhijun Zhang,
  • Caiwu Luo,
  • Hong Wang

摘要

Red clay is susceptible to long-term performance degradation and structural instability. This study employs enzyme-induced carbonate precipitation (EICP) technology with calcium lignosulfonate (CaLS) as the calcium source. The study modifies the particle size distribution of red clay by incorporating quartz sand (QS) and uranium mill tailings (UMTs) with different ratios and grain sizes, thereby enhancing its permeability and solidification effects. The influence of different compaction degrees, curing ages, and cementation solution replenishment methods on unconfined compressive strength (UCS) is also examined. The comparisons of UCS and ultrasonic velocity of unreinforced red clay, EICP-reinforced red clay, and EICP-reinforced remolded red clay show that EICP significantly improves red clay reinforced effect. The UCS and ultrasonic velocity of the reinforced specimens exhibit an exponential relationship. The validation results indicate that the exponential relationship fitting is effective and accurately reflects the relationship between the UCS and ultrasonic velocity of the reinforced soil, providing a new method for predicting and assessing mechanical strength of geotechnical materials.