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<p>The mechanical behavior of ignimbrites is crucial for applications in geotechnical engineering and natural hazard assessment. This study investigates three lithofacies of the La Escalera ignimbrites, characterized by varying degrees of welding and granular textures, to understand the influence of these factors on their mechanical properties and failure mechanisms. Using uniaxial compressive strength (UCS) tests and numerical simulations with the Particle Flow Code (PFC<sup>2D</sup>), we analyzed the effects of welding degree and texture on the ignimbrite mechanical response. The experimental results revealed variations in UCS, Elastic Modulus (E), and Poisson ratio (υ), which were employed to calibrate the PFC<sup>2D</sup> models. These models effectively replicated the stress-strain behavior and fracture patterns observed in laboratory tests for lithofacies with lower degrees of welding. However, the model showed less precision in capturing the mechanical behavior of the highly welded lithofacies, suggesting that its reduced granularity requires more advanced calibration techniques. Our findings reveal that a higher degree of welding enhances strength and brittleness, leading to distinct mechanical responses under stress. This study confirms the reliability of PFC<sup>2D</sup> in simulating the complex behavior of volcanic rocks and highlights the need for model refinements to better represent highly welded ignimbrites. These insights are crucial for improving predictive models in geotechnical applications involving ignimbrites, contributing to the safer design and management of infrastructure in volcanic regions.</p>

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Mechanical Behavior and Numerical Modeling of La Escalera Ignimbrites: Experimental and Comparative Insights

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年7月6日

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  • Elizabeth Rivera-Calderón,
  • Hugo Sereno,
  • Amador Castro-Colin,
  • Antonio Pola,
  • Adriana Nadcielli Soto-Rodríguez,
  • Víctor Alfonso Hernández-Hernández,
  • Francisco Javier Domínguez-Mota

摘要

The mechanical behavior of ignimbrites is crucial for applications in geotechnical engineering and natural hazard assessment. This study investigates three lithofacies of the La Escalera ignimbrites, characterized by varying degrees of welding and granular textures, to understand the influence of these factors on their mechanical properties and failure mechanisms. Using uniaxial compressive strength (UCS) tests and numerical simulations with the Particle Flow Code (PFC2D), we analyzed the effects of welding degree and texture on the ignimbrite mechanical response. The experimental results revealed variations in UCS, Elastic Modulus (E), and Poisson ratio (υ), which were employed to calibrate the PFC2D models. These models effectively replicated the stress-strain behavior and fracture patterns observed in laboratory tests for lithofacies with lower degrees of welding. However, the model showed less precision in capturing the mechanical behavior of the highly welded lithofacies, suggesting that its reduced granularity requires more advanced calibration techniques. Our findings reveal that a higher degree of welding enhances strength and brittleness, leading to distinct mechanical responses under stress. This study confirms the reliability of PFC2D in simulating the complex behavior of volcanic rocks and highlights the need for model refinements to better represent highly welded ignimbrites. These insights are crucial for improving predictive models in geotechnical applications involving ignimbrites, contributing to the safer design and management of infrastructure in volcanic regions.