Biogeotechnics

Drained Response of Microbially Induced Calcite Precipitation (MICP) Treated Sand Under Various Treatment Conditions

MICP is a novel ground improvement method that harnesses the biogeochemical reactions to precipitate calcium carbonate in the soils.

The objectives of this study are to:

  • ─░nvestigate the drained response of MICP treated sands by performing drained triaxial test under 100, 200 and 400 kPa effective stresses
  • Enhance the geomechanical properties (stiffness, shear strength, dilatancy) of sands
  • ─░nvestigate the effect of treatment concentration and number on mechanical behavior
  • Outline how microscale changes affect the macroscale behavior

Drained Response of Microbially Induced Calcite Precipitation (MICP) Treated Sand Under Various Treatment Conditions

The MICP treatments:

  • ─░mprove stiffness, shear strength, dilatancy of sands
  • Change the material behavior from ductile to brittle dueto interparticle binding and grain coating CaCO3 crystals.

Under the same:

  • Chemical concentration, increasing the injection number leads to an increase in peak shear strength.
  • Treatment number, increasing the chemical concentration increases the peak shear strength.