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<p>Volcanic ash (VA) has the potential to serve as a filling material in volcanic regions. Despite the available research on various soil materials, there remains a noticeable gap in the literature concerning the dynamic engineering properties of volcanic ash fill materials. Therefore, 104 dynamic triaxial tests were conducted to investigate the influence of initial water content, confining pressure, and dynamic stress on the dynamic properties of VA. The results revealed that the accumulated plastic strain positively correlates with water content and dynamic stress, while an increase in confining pressure improves deformation resistance. At high dynamic stress levels, the strength of specimens becomes insufficient, leading to shear instability. In an unsaturated state, the dynamic modulus exhibits a triphasic behavior characterized by a sequence of “reduction - increase - reduction”, which can be attributed to the three stages of “structural damage - compression densification - particle breakage”. The damping ratio decreases with vibrations. When specimens are saturated, they display liquefied damage with an increase in dynamic stress. The dynamic modulus decreases with dynamic strain, while the damping ratio initially decreases before increasing. This study enhances the understanding of dynamic properties of volcanic ash soils and provides a reference for the application of volcanic ash in geotechnical engineering.</p>

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Dynamic characteristics of compacted volcanic Ash under long-term Cyclic loads

  • 期刊论文

  • 发表日期：

    2025年12月5日

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  • Hailiang Liu,
  • Changming Wang,
  • Di Wu,
  • Mingmin Zhang

摘要

Volcanic ash (VA) has the potential to serve as a filling material in volcanic regions. Despite the available research on various soil materials, there remains a noticeable gap in the literature concerning the dynamic engineering properties of volcanic ash fill materials. Therefore, 104 dynamic triaxial tests were conducted to investigate the influence of initial water content, confining pressure, and dynamic stress on the dynamic properties of VA. The results revealed that the accumulated plastic strain positively correlates with water content and dynamic stress, while an increase in confining pressure improves deformation resistance. At high dynamic stress levels, the strength of specimens becomes insufficient, leading to shear instability. In an unsaturated state, the dynamic modulus exhibits a triphasic behavior characterized by a sequence of “reduction - increase - reduction”, which can be attributed to the three stages of “structural damage - compression densification - particle breakage”. The damping ratio decreases with vibrations. When specimens are saturated, they display liquefied damage with an increase in dynamic stress. The dynamic modulus decreases with dynamic strain, while the damping ratio initially decreases before increasing. This study enhances the understanding of dynamic properties of volcanic ash soils and provides a reference for the application of volcanic ash in geotechnical engineering.