Calcareous sand is oftenused as the filling materialin marine geotechnical engineering, and it is to be reinforced in practice. The technology of Microbial Induced Carbonate Precipitation（MICP）provides a new cementway to reinforce the calcareous sand.In this paper, we study how to use MICP by the mixing method to reinforce the calcareous sand.The mixing method is very different from the grouting method often used in previous studies.Experiments of direct shear tests and oedometer tests of calcareous sand sampleswere carried out. The different particle sizescomposition and the different reaction solution concentrations were considered. Thetest results showed that high concentration of reaction solution led to more precipitation of calcium carbonate, and the shear strength and the stiffness of calcareous sand were improved. It is shown thatthe mixingmethod of MICP technologyhas certain feasibilityinthe dredged filltreatmentof calcareous sand.
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