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Evaluation of liquefaction resistance for single- and multi-phase SICP-treated sandy soil using shaking table test
https://orcid.org/http://orcid.org/0000-0001-5420-2714
Soybean-induced carbonate precipitation (SICP) is a promising method for improving the sandy soil prone to liquefaction. This study evaluated the biocementation efficiency of the single- and multi-phase SICP treatment to improve the liquefaction resistance of a sandy soil. The optimum concentrations for the soybean urease and cementation solution were determined at 20 g/L and 0.4 mol/L, respectively, with an injection interval of 24 h in the multi-phase SICP treatment. A series of shaking table tests were conducted on sandy soil at different relative densities with the single- and multi-phase SICP treatment. Results show that the acceleration response, pore water pressure development, and liquefaction resistance of SICP-treated sands deviate significantly from those of the clean sand. The induced calcium carbonate precipitation could effectively bridge the sand grains and/or fill the inter-grain voids, densifying the soil and changing the grain size distribution. The development rates of pore pressure ratio were observed to reduce by 95% and 100% for medium-density sand (e.g., Dr = 50%) with multi-phase SICP treatment under the low and high seismic intensities, respectively, and those decreased by 96% and 94% for dense sand (e.g., Dr = 70%) with single-phase SICP treatment. It is recommended employing the multi-phase SICP treatment for medium-density sand to improve the liquefaction resistance while being cost-efficient. No liquefaction was observed in soil with the multi-phase SICP treatment regardless of the amplitude of ground motion and shaking duration, whereas the single-phase SICP treatment would be appropriate to mitigate liquefaction for dense sand.
Evaluation of liquefaction resistance for single- and multi-phase SICP-treated sandy soil using shaking table test
https://orcid.org/http://orcid.org/0000-0001-5420-2714
Soybean-induced carbonate precipitation (SICP) is a promising method for improving the sandy soil prone to liquefaction. This study evaluated the biocementation efficiency of the single- and multi-phase SICP treatment to improve the liquefaction resistance of a sandy soil. The optimum concentrations for the soybean urease and cementation solution were determined at 20 g/L and 0.4 mol/L, respectively, with an injection interval of 24 h in the multi-phase SICP treatment. A series of shaking table tests were conducted on sandy soil at different relative densities with the single- and multi-phase SICP treatment. Results show that the acceleration response, pore water pressure development, and liquefaction resistance of SICP-treated sands deviate significantly from those of the clean sand. The induced calcium carbonate precipitation could effectively bridge the sand grains and/or fill the inter-grain voids, densifying the soil and changing the grain size distribution. The development rates of pore pressure ratio were observed to reduce by 95% and 100% for medium-density sand (e.g., Dr = 50%) with multi-phase SICP treatment under the low and high seismic intensities, respectively, and those decreased by 96% and 94% for dense sand (e.g., Dr = 70%) with single-phase SICP treatment. It is recommended employing the multi-phase SICP treatment for medium-density sand to improve the liquefaction resistance while being cost-efficient. No liquefaction was observed in soil with the multi-phase SICP treatment regardless of the amplitude of ground motion and shaking duration, whereas the single-phase SICP treatment would be appropriate to mitigate liquefaction for dense sand.
Evaluation of liquefaction resistance for single- and multi-phase SICP-treated sandy soil using shaking table test
https://orcid.org/http://orcid.org/0000-0001-5420-2714
Soybean-induced carbonate precipitation (SICP) is a promising method for improving the sandy soil prone to liquefaction. This study evaluated the biocementation efficiency of the single- and multi-phase SICP treatment to improve the liquefaction resistance of a sandy soil. The optimum concentrations for the soybean urease and cementation solution were determined at 20 g/L and 0.4 mol/L, respectively, with an injection interval of 24 h in the multi-phase SICP treatment. A series of shaking table tests were conducted on sandy soil at different relative densities with the single- and multi-phase SICP treatment. Results show that the acceleration response, pore water pressure development, and liquefaction resistance of SICP-treated sands deviate significantly from those of the clean sand. The induced calcium carbonate precipitation could effectively bridge the sand grains and/or fill the inter-grain voids, densifying the soil and changing the grain size distribution. The development rates of pore pressure ratio were observed to reduce by 95% and 100% for medium-density sand (e.g., Dr = 50%) with multi-phase SICP treatment under the low and high seismic intensities, respectively, and those decreased by 96% and 94% for dense sand (e.g., Dr = 70%) with single-phase SICP treatment. It is recommended employing the multi-phase SICP treatment for medium-density sand to improve the liquefaction resistance while being cost-efficient. No liquefaction was observed in soil with the multi-phase SICP treatment regardless of the amplitude of ground motion and shaking duration, whereas the single-phase SICP treatment would be appropriate to mitigate liquefaction for dense sand.
Evaluation of liquefaction resistance for single- and multi-phase SICP-treated sandy soil using shaking table test
Acta Geotech.
Zhou, Yundong (author) / Zhang, Yi (author) / Geng, Weijuan (author) / He, Jia (author) / Gao, Yufeng (author)
Acta Geotechnica ; 18 ; 6007-6025
2023-11-01
19 pages
Article (Journal)
Electronic Resource
English
Liquefaction resistance , Sandy soil , Shake table test , Soil improvement , Soybean-induced carbonate precipitation (SICP) Engineering , Geoengineering, Foundations, Hydraulics , Solid Mechanics , Geotechnical Engineering & Applied Earth Sciences , Soil Science & Conservation , Soft and Granular Matter, Complex Fluids and Microfluidics
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