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Study on Pore Water Pressure Model of EICP-Solidified Sand under Cyclic Loading
Gang Li1, Yu Li2, Xueqing Hua1
1Shaanxi Key Laboratory of Safety and Durability of Concrete Structures, Xijing University, Xi'an 710123, China.
Materials (Basel, Switzerland)
|October 16, 2024
Summary
Enzyme-induced calcium carbonate precipitation (EICP) enhances sand foundation stability against liquefaction. Higher cementation, density, and frequency improve resistance, while increased confining pressure and cyclic stress accelerate pore water pressure buildup.
Area of Science:
- Geotechnical Engineering
- Material Science
- Environmental Engineering
Background:
- Saturated sand foundations are vulnerable to liquefaction under dynamic loads, necessitating reinforcement.
- Traditional methods are costly, time-consuming, and environmentally damaging.
- Enzyme-induced calcium carbonate precipitation (EICP) offers an economical, eco-friendly, and durable alternative.
Purpose of the Study:
- To analyze the pore water pressure development in EICP-solidified sand under cyclic loading.
- To establish a pore water pressure model for EICP-treated sand.
- To evaluate the effectiveness of EICP in improving liquefaction resistance.
Main Methods:
- Triaxial consolidated undrained shear tests under cyclic loading.
- Investigation of factors: confining pressure (σ₃), cementation number (Pc), cyclic stress ratio (CSR), initial dry density (ρd), and vibration frequency (f).
- Development and validation of a three-parameter unified pore water pressure model.
Main Results:
- Increased σ₃ and CSR accelerate pore water pressure and reduce liquefaction resistance.
- Increased Pc, ρd, and f decrease pore water pressure, enhance liquefaction resistance, and increase the vibration number required for liquefaction.
- The established model accurately predicts pore water pressure development for both A-type and B-type curves.
Conclusions:
- EICP effectively improves the anti-liquefaction properties of sand foundations.
- The pore water pressure model provides a reliable tool for assessing EICP-treated sand behavior.
- This research offers significant insights for preventing sand liquefaction in engineering applications.
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