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<p>Underground structures are prone to cracks from aging, construction flaws, and geological factors. Increasing urban development near existing buildings, along with extensive drilling and blasting, raises concerns regarding blast-induced damage. This study utilized high-voltage pulse discharge (HVPD) technology as a simulated blast source to systematically investigate the dynamic response of cracked structures under blast loading. Controlled experiments were conducted on cracked structures to examine distance effects (30/45/60&#xa0;cm) of structural cracks under cyclic blasting tests (five repeated blasts). A multi-parameter approach integrated vibration velocity, dynamic strain, and passive piezoelectric signals to characterize instantaneous structural responses, while visual inspection and active piezoelectric signals assessed damage evolution. Three key findings emerged: (1) Blast-exposed side cracks dramatically amplified vibration responses, with 56.8% higher x direction velocity, 113% greater dynamic strain, and 110% stronger passive piezoelectric signals when crack at 30&#xa0;cm versus uncracked conditions. Peak arrival time demonstrated nonlinear acceleration, while decay rates increased exponentially with decreasing blast-to-crack distance. (2) Prefabricated cracks 30&#xa0;cm from the source guided oblique crack propagation without affecting the inherent failure modes of blastholes. Piezoelectric active monitoring revealed distance-dependent microstructural deterioration, with cracked structures exhibiting: signal attenuation (15-fold) and frequency upshift (0–250 to 250–500&#xa0;kHz) compared to uncracked conditions. This frequency-domain response, coupled with progressive signal attenuation, demonstrated a significant correlation between blast proximity and structural degradation. (3) Piezoelectric monitoring demonstrated dual efficacy for real-time response tracking and damage assessment, offering practical insights for protecting adjacent structures during blasting.</p>

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Vibration Response and Damage Assessment of Cracked Structures Subjected to High-Voltage Pulse Discharge

  • 期刊论文

  • 发表日期：

    2025年10月27日

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  • Junying Xia,
  • Bo Wang,
  • Guodong Zhang,
  • Jie Dong,
  • Changyu Peng

摘要

Underground structures are prone to cracks from aging, construction flaws, and geological factors. Increasing urban development near existing buildings, along with extensive drilling and blasting, raises concerns regarding blast-induced damage. This study utilized high-voltage pulse discharge (HVPD) technology as a simulated blast source to systematically investigate the dynamic response of cracked structures under blast loading. Controlled experiments were conducted on cracked structures to examine distance effects (30/45/60 cm) of structural cracks under cyclic blasting tests (five repeated blasts). A multi-parameter approach integrated vibration velocity, dynamic strain, and passive piezoelectric signals to characterize instantaneous structural responses, while visual inspection and active piezoelectric signals assessed damage evolution. Three key findings emerged: (1) Blast-exposed side cracks dramatically amplified vibration responses, with 56.8% higher x direction velocity, 113% greater dynamic strain, and 110% stronger passive piezoelectric signals when crack at 30 cm versus uncracked conditions. Peak arrival time demonstrated nonlinear acceleration, while decay rates increased exponentially with decreasing blast-to-crack distance. (2) Prefabricated cracks 30 cm from the source guided oblique crack propagation without affecting the inherent failure modes of blastholes. Piezoelectric active monitoring revealed distance-dependent microstructural deterioration, with cracked structures exhibiting: signal attenuation (15-fold) and frequency upshift (0–250 to 250–500 kHz) compared to uncracked conditions. This frequency-domain response, coupled with progressive signal attenuation, demonstrated a significant correlation between blast proximity and structural degradation. (3) Piezoelectric monitoring demonstrated dual efficacy for real-time response tracking and damage assessment, offering practical insights for protecting adjacent structures during blasting.