Characterizing the Deformation Evolution with Stress and Time of Biocemented Sands

Soil biocementation represents an emerging technique that has dominated the development of sustainable and innovative geotechnics during past decade. Despite numerous studies focusing on peak strength behavior ensuing softening response, less is known about stress- time-dependent deformability biocemented geomaterials even though it remains central for most envisaged applications. This study comprised experimental campaign two microbially induced carbonate precipitation (MICP)-treated sands with different initial characteristics. Samples various calcite contents were subjected to uniaxial incremental loading long-term monotonic evaluate their compressibility capture principles deformation. Furthermore, use porosity-to-cement ratio, originally developed artificially bonded soils, herein evaluated as a parameter express MICP-treated sands. Observations from revealed range between 3% 8% applied stress levels up 1,000 kPa, MICP treatment significantly enhanced stiffness properties reduced overall deformability. Medium-grained sand required lower bond achieve similar fine-grained was more compatible ratio. The effects time dependency also assessed under sustained loads over long (>75 days). Under high stresses exceeding apparent preconsolidation stress, coefficient secondary compression reached threefold increase compared untreated state. Based behavioral characterization, considerations shown be interdependent. cementation achieved by shifted portion immediate settlement, which released delayed deformation after breakage took place, depending configuration quality (deposition imperfections), determined via microstructural observations.