Oedometer test of calcareous sands solidified using the MICP mixing method

GUO Hongxian; LI Dongrun; MA Ruinan; CHENG Xiaohui

doi:10.16511/j.cnki.qhdxxb.2019.21.018

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Journal of Tsinghua University(Science and Technology) ›› 2019, Vol. 59 ›› Issue (8) : 593-600. DOI: 10.16511/j.cnki.qhdxxb.2019.21.018

MICROBIAL GEOTECHNOLOGY

Oedometer test of calcareous sands solidified using the MICP mixing method

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Abstract

Microbially induced carbonate precipitation (MICP) was used to treat calcareous sand to improve the compressive properties of the sand. Oedometer tests showed how the compressive properties of the calcareous sand differed from quartz sand. The tests evaluated the effects of the particle size gradation, the relative density and the reaction solution concentration on the compressive properties of the carbonate sands. The tests showed that small amounts of bacteria solution and reaction solution mixed with the calcareous sand greatly improved the compressive properties of the sand after solidification with the compression index reduced by about 0.10 on average and the e-lgp curve having 2 or 3 distinct straight segments. The particle size gradation and the relative density both affect the reinforced sample compressibility with high-concentration reaction solutions further reducing the calcareous sand compressibility.

Key words

calcareous sands / microbially induced carbonate precipitation (MICP) / compressive property / particle size distribution / relative density / reaction solution

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GUO Hongxian, LI Dongrun, MA Ruinan, CHENG Xiaohui. Oedometer test of calcareous sands solidified using the MICP mixing method[J]. Journal of Tsinghua University(Science and Technology). 2019, 59(8): 593-600 https://doi.org/10.16511/j.cnki.qhdxxb.2019.21.018

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