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<p>To investigate the impact of drying-wetting cycles on crack evolution in compacted loess, essential for understanding soil mechanical behavior and preventing geotechnical failures, a novel method using a Contact Image Sensor (CIS) -based scanning image acquisition technique was proposed to perform controlled experiments across varying dry densities and cycle paths. The Pore Crack Analysis System (PCAS) quantified the cracks, while digital image correlation (DIC) captured detailed displacement and strain in the soil samples. Our research shows that combining CIS and DIC yields highly accurate measurements of soil surface movements and strain patterns. Key findings include: (1) Higher dry densities resist crack propagation, whereas increased drying-wetting cycle amplitudes reduce the water content threshold, promoting crack maturation; (2) Soil crack evolution involves three stages: initial slow growth, rapid acceleration, and slowed or stagnant development; (3) Primary strain along the crack centerline decreases linearly with distance from the origin, with diminishing influence further from the crack edge. This study provides new insights into crack development in compacted loess and demonstrates the potential of CIS and DIC as highly precise diagnostic tools in soil mechanics.</p>

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Innovative surface scanning and digital image correlation analysis of cracking in compacted loess during drying-wetting cycles

  • 期刊论文

  • 发表日期：

    2025年6月23日

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  • Ge Wang,
  • Jian Xu,
  • Yili Yuan,
  • Changming Hu,
  • Yuan Mei

摘要

To investigate the impact of drying-wetting cycles on crack evolution in compacted loess, essential for understanding soil mechanical behavior and preventing geotechnical failures, a novel method using a Contact Image Sensor (CIS) -based scanning image acquisition technique was proposed to perform controlled experiments across varying dry densities and cycle paths. The Pore Crack Analysis System (PCAS) quantified the cracks, while digital image correlation (DIC) captured detailed displacement and strain in the soil samples. Our research shows that combining CIS and DIC yields highly accurate measurements of soil surface movements and strain patterns. Key findings include: (1) Higher dry densities resist crack propagation, whereas increased drying-wetting cycle amplitudes reduce the water content threshold, promoting crack maturation; (2) Soil crack evolution involves three stages: initial slow growth, rapid acceleration, and slowed or stagnant development; (3) Primary strain along the crack centerline decreases linearly with distance from the origin, with diminishing influence further from the crack edge. This study provides new insights into crack development in compacted loess and demonstrates the potential of CIS and DIC as highly precise diagnostic tools in soil mechanics.