Dynamic tests of long-term deformation of MICP cemented calcareous sand
ZHANG Lei
YANG Junjie
WANG Ziyu
Abstract：The Microbially-induced calcite precipitation(MICP)method was used to test the calcareous sand collected from an island of South China Sea.A series of long-term dynamic triaxial tests of cemen-ted samples were carried out to investigate the evolution of accumulated axial strain under different cy-clic loading and nutrient concentrations.The experiments results indicated that the capability of the re-sisting deformation of MICP cemented calcareous sand are improved,and the increase of nutrients can improve the ability of MCP cemented calcareous sand to resist deformation.The accumulated axial strain of MICP cemented calcareous sand showed a hyperbolic relationship with the cyclic vibration number.The accumulated axial strain increased rapidly at the early stage of loading.With the loading progresses,the growth rate of the accumulated axial strain gradually slowed down and the accumulated axial strain eventually tended to be stable.On this basis,the cyclic stress ratio was introduced to estab-lish the permanent deformation prediction formula of MICP cemented coral sand under cyclic loading,which was of positive effects on predicting the long-tern deformation of MICP cemented coral sand un-der cyclic loading.
Keywords：calcareous sandmicrobially-induced calcite precipitationcyclic loadingpermanent de-formation
Publication Date：2023-12-28
Online Publishing Date：2026-05-22(First online date of this platform, not the publication date of the document)
Pages：8( 19-26 )