Study on Pore Water Pressure Model of EICP-Solidified Sand under Cyclic Loading.

Materials (Basel)

Shaanxi Key Laboratory of Safety and Durability of Concrete Structures, Xijing University, Xi'an 710123, China.

Published: September 2024

AI Article Synopsis

  • Saturated sand foundations can experience liquefaction under various loads, making foundation reinforcement crucial for stability and resistance.
  • Traditional methods of foundation treatment have drawbacks such as high costs, lengthy construction times, and negative environmental impacts, while enzyme-induced calcium carbonate precipitation (EICP) offers a more sustainable and cost-effective alternative.
  • Experimental tests on EICP-treated sand revealed factors like confining pressure and cyclic stress influence pore water pressure and liquefaction resistance, leading to the establishment of a predictive model for pore water pressure behavior, which could help in preventing sand liquefaction.

Article Abstract

Under traffic load, earthquake load, and wave load, saturated sand foundation is prone to liquefaction, and foundation reinforcement is the key measure to improve its stability and liquefaction resistance. Traditional foundation treatment methods have many problems, such as high cost, long construction period, and environmental pollution. As a new solidification method, enzyme-induced calcium carbonate precipitation (EICP) technology has the advantages of economy, environmental protection, and durability. Through a triaxial consolidated undrained shear test under cyclic loading, the impacts of confining pressure (), cementation number (), cyclic stress ratio (), initial dry density (), and vibration frequency () on the development law of pore water pressure of EICP-solidified sand are analyzed and then a pore water pressure model suitable for EICP-solidified sand is established. The result shows that as and increase, the rise rate of pore water pressure of solidified sand gradually accelerates, and with a lower vibration number required for liquefaction, the anti-liquefaction ability of solidified sand gradually weakens. However, as , , and rise, the increase rate of pore water pressure of solidified sand gradually lowers, the vibration number required for liquefaction increases correspondingly, and its liquefaction resistance gradually increases. The test results are highly consistent with the predictive results, which show that the three-parameter unified pore water pressure model is suitable for describing the development law of A-type and B-type pore water pressure of EICP-solidified sand at the same time. The study results provide essential reference value and scientific significance in guidance for preventing sand foundations from liquefying.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC11478135PMC
http://dx.doi.org/10.3390/ma17194800DOI Listing

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