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<p>Bio-cementation techniques are widely used in coastal engineering, but its performance degradation mechanism under dynamic impact loads is not clear, which seriously restricts its engineering application potential under extreme conditions, such as blasting impact, etc. Therefore, we employed plasma blasting technology to simulate extreme dynamic impact conditions, conducting systematic tests on both EICP-treated and sisal fiber-reinforced sand to characterize their dynamic response behavior. Specifically, the number of EICP treatment cycles (1–2 cycles), sisal fiber content (0 and 0.5% by mass) and discharge voltages (3, 6, 9, 12, 15&#xa0;kV) were considered. The results demonstrate that both additional EICP treatment cycles and sisal fiber incorporation enhance the impact resistance of sand, with fiber reinforcement exhibiting a more pronounced effect. Under dynamic loading, samples treated by EICP alone exhibited penetration failure due to brittle cementation failure rapidly, and the average failure rate is higher than that strengthened by EICP-fiber reinforcement under the same discharge voltage. The incorporation of sisal fiber effectively enhances the bonding strength between particles, redistributes the stress of impact action in the material, delays the damage propagation, significantly improves the threshold energy of failure, and reduces the failure rate. Finally, drawing upon established theories of soil resistivity in both saturated and unsaturated conditions, this study develops a novel damage assessment methodology that correlates electrical resistivity with blasting energy in bio-cemented sands. The proposed analytical framework, incorporating optimized regression analysis, addresses a critical research gap regarding the dynamic performance of biomineralized soils under impact loading.</p>

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Experimental investigation on the failure behavior of EICP combined with sisal fiber-reinforced sandy soil subjected to plasma blasting

  • 期刊论文

  • 发表日期：

    2025年10月31日

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  • Sheng Zhang,
  • Chuangzhou Wu,
  • Zuoyong Li,
  • Zhichao Song,
  • Zhenyuan Liu,
  • Shixia Zhang

摘要

Bio-cementation techniques are widely used in coastal engineering, but its performance degradation mechanism under dynamic impact loads is not clear, which seriously restricts its engineering application potential under extreme conditions, such as blasting impact, etc. Therefore, we employed plasma blasting technology to simulate extreme dynamic impact conditions, conducting systematic tests on both EICP-treated and sisal fiber-reinforced sand to characterize their dynamic response behavior. Specifically, the number of EICP treatment cycles (1–2 cycles), sisal fiber content (0 and 0.5% by mass) and discharge voltages (3, 6, 9, 12, 15 kV) were considered. The results demonstrate that both additional EICP treatment cycles and sisal fiber incorporation enhance the impact resistance of sand, with fiber reinforcement exhibiting a more pronounced effect. Under dynamic loading, samples treated by EICP alone exhibited penetration failure due to brittle cementation failure rapidly, and the average failure rate is higher than that strengthened by EICP-fiber reinforcement under the same discharge voltage. The incorporation of sisal fiber effectively enhances the bonding strength between particles, redistributes the stress of impact action in the material, delays the damage propagation, significantly improves the threshold energy of failure, and reduces the failure rate. Finally, drawing upon established theories of soil resistivity in both saturated and unsaturated conditions, this study develops a novel damage assessment methodology that correlates electrical resistivity with blasting energy in bio-cemented sands. The proposed analytical framework, incorporating optimized regression analysis, addresses a critical research gap regarding the dynamic performance of biomineralized soils under impact loading.