Jason T. DeJong
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View article: NHERI centrifuge facility: systems-scale hypergravity modeling in engineering and scientific research
NHERI centrifuge facility: systems-scale hypergravity modeling in engineering and scientific research Open
The Natural Hazards Engineering Research Infrastructure facility at the University of California at Davis (UC Davis) is equipped with 9-m- and 1-m-radius geotechnical centrifuges that provide unique, world-class facilities for scaled model…
View article: Effect of natural carbonates on microbially induced calcite precipitation process
Effect of natural carbonates on microbially induced calcite precipitation process Open
Microbially induced calcite precipitation (MICP) is an emerging ground improvement technique that uses microbes to induce cementation between soil particles. To date, the majority of research has focused on exploring MICP with silica-rich …
View article: A DEM Investigation on the Effect of Gradation on the Liquefaction Response and Fabric Evolution of Soils
A DEM Investigation on the Effect of Gradation on the Liquefaction Response and Fabric Evolution of Soils Open
Assessment of liquefaction triggering potential is an important aspect in the design of critical infrastructure. This paper uses Discrete Element Modeling (DEM) simulations to explore the effect of gradation on the liquefaction triggering …
View article: Life Cycle Sustainability Assessment of Microbially Induced Calcium Carbonate Precipitation (MICP) Soil Improvement Techniques
Life Cycle Sustainability Assessment of Microbially Induced Calcium Carbonate Precipitation (MICP) Soil Improvement Techniques Open
Microbially induced calcium carbonate precipitation (MICP) is a biomediated ground improvement technology that uses ureolytic bacteria to precipitate calcium carbonate minerals to improve the strength and stiffness of soils. MICP can be me…
View article: Architecture characterization of orchard trees for mechanical behavior investigations
Architecture characterization of orchard trees for mechanical behavior investigations Open
Characterizing the architecture of tree root systems is essential to advance the development of root-inspired anchorage in engineered systems. This study explores the structural root architectures of orchard trees to understand the interpl…
View article: Investigation of piezocone dissipation test interpretation in clay accounting for vertical and horizontal porewater pressure dissipation with a large deformation axisymmetric penetration model
Investigation of piezocone dissipation test interpretation in clay accounting for vertical and horizontal porewater pressure dissipation with a large deformation axisymmetric penetration model Open
The piezocone (CPTu) dissipation test is used to characterize how the applied load from the penetrating cone is distributed between the soil and pore fluid during both penetrometer advancement and when penetration is paused. The coefficien…
View article: Evaluation of life cycle assessment (LCA) use in geotechnical engineering
Evaluation of life cycle assessment (LCA) use in geotechnical engineering Open
In recent years, there has been a growing emphasis to incorporate sustainability metrics into geotechnical engineering design decisions, driven by the surging eco-consciousness of industry standards. Consequently, life cycle assessment (LC…
View article: Pore-scale precipitation pattern and grain-scale cementation strength by microbially induced calcium carbonate precipitation (MICP)
Pore-scale precipitation pattern and grain-scale cementation strength by microbially induced calcium carbonate precipitation (MICP) Open
Microbial induced calcium carbonate precipitation (MICP) is widely investigated as a sustainable method of soil improvement. The pore-scale precipitation habit of calcium carbonate (CaCO 3 ) and the grain-scale mechanical strength of the c…
View article: Gradation and state effects on the strength and dilatancy of coarse-grained soils
Gradation and state effects on the strength and dilatancy of coarse-grained soils Open
Well-graded soils can be found in nature and in engineered structures, such as dams and embankments. Prediction of their behavior is still an engineering challenge in part due to the lack of data in the literature, arguably due to difficul…
View article: Reductions in Hydraulic Conductivity of Sands Caused by Microbially Induced Calcium Carbonate Precipitation
Reductions in Hydraulic Conductivity of Sands Caused by Microbially Induced Calcium Carbonate Precipitation Open
Microbially induced calcite precipitation (MICP) modifies soil behavior and properties through the precipitation of calcium carbonate (CaCO3) in the pore space. It has gained prominence as one strategy for biologically induced soil improve…
View article: Submission to: Sdee
Submission to: Sdee Open
View article: Architecture characterization of orchard trees for mechanical behavior investigations
Architecture characterization of orchard trees for mechanical behavior investigations Open
Background Statistical analysis of root architectural parameters is necessary for development and exploration of root structure representations and their resulting anchorage properties. Three-dimensional (3D) models of orchard tree root sy…
View article: Axisymmetric Simulations of Cone Penetration in Biocemented Sands
Axisymmetric Simulations of Cone Penetration in Biocemented Sands Open
With the recent advances in the biogeotechnics field and specifically microbially induced calcite precipitation (MICP), cone penetration testing (CPT) has become a valuable tool to overcome the challenges associated with intact sampling of…
View article: Architecture characterization of orchard trees for mechanical behavior investigations
Architecture characterization of orchard trees for mechanical behavior investigations Open
Aims This study explores structural root architectures of orchard trees to understand the interplays between the mechanical behavior of roots and the root architecture. Methods Full three-dimensional (3D) models of natural tree root system…
View article: Micro-scale investigations of temperature-dependent Microbial-Induced Carbonate Precipitation (MICP) in the temperature range 4-50 °C
Micro-scale investigations of temperature-dependent Microbial-Induced Carbonate Precipitation (MICP) in the temperature range 4-50 °C Open
Microbially-Induced Carbonate Precipitation (MICP) involves a series of bio-geochemical reactions whereby microbes alter the surrounding aqueous environment and induce calcium carbonate precipitation. MICP has a broad range of applications…
View article: Life-cycle sustainability assessment of geotechnical site investigation
Life-cycle sustainability assessment of geotechnical site investigation Open
The life-cycle impacts of site characterization, an important component of most geotechnical engineering projects, are typically not considered in practice nor have they been studied in detail. A life-cycle sustainability assessment (LCSA)…
View article: Bio-inspired geotechnical engineering: principles, current work, opportunities and challenges
Bio-inspired geotechnical engineering: principles, current work, opportunities and challenges Open
A broad diversity of biological organisms and systems interact with soil in ways that facilitate their growth and survival. These interactions are made possible by strategies that enable organisms to accomplish functions that can be analog…
View article: Effects of bacterial density on growth rate and characteristics of microbial-induced CaCO3 precipitates: a particle-scale experimental study
Effects of bacterial density on growth rate and characteristics of microbial-induced CaCO3 precipitates: a particle-scale experimental study Open
Microbial-Induced Carbonate Precipitation (MICP) has been explored for more than a decade as a promising soil improvement technique. However, it is still challenging to predict and control the growth rate and characteristics of CaCO3 preci…
View article: NHERI Centrifuge Facility: Large-Scale Centrifuge Modeling in Geotechnical Research
NHERI Centrifuge Facility: Large-Scale Centrifuge Modeling in Geotechnical Research Open
The 9-m and 1-m radius geotechnical centrifuges at the Natural Hazards Engineering Research Infrastructure (NHERI) facility at the University of California at Davis provide the national research community with open access to unique and ver…
View article: Enhancing strength of MICP-treated sandy soils: from micro to macro scale
Enhancing strength of MICP-treated sandy soils: from micro to macro scale Open
Microbial-Induced Calcium carbonate (CaCO3) Precipitation (MICP) has been extensively studied for soil improvement in geotechnical engineering. The properties of calcium carbonate crystals such as size and quantity affect the strength of M…
View article: Life cycle sustainability assessment of enzyme-induced carbonate precipitation (EICP) for fugitive dust control
Life cycle sustainability assessment of enzyme-induced carbonate precipitation (EICP) for fugitive dust control Open
Fugitive dust caused by infrastructure construction reduces air quality and may cause serious respiratory problems. Earthwork contractors apply dust control strategies to meet environmental regulations for dust mitigation. A life cycle sus…
View article: Closure to “Axisymmetric Simulations of Cone Penetration in Saturated Clay” by Diane M. Moug, Ross W. Boulanger, Jason T. DeJong, and Robert A. Jaeger
Closure to “Axisymmetric Simulations of Cone Penetration in Saturated Clay” by Diane M. Moug, Ross W. Boulanger, Jason T. DeJong, and Robert A. Jaeger Open
The original paper presented an axisymmetric cone penetration model and simulations of cone penetration in saturated clay with the Mohr-Coulomb (MC), modified Cam clay (MCC), and MIT-S1 constitutive models calibrated to Boston blue clay (B…
View article: Investigating Ammonium By-product Removal for Ureolytic Bio-cementation Using Meter-scale Experiments
Investigating Ammonium By-product Removal for Ureolytic Bio-cementation Using Meter-scale Experiments Open
Microbially Induced Calcite Precipitation (MICP), or bio-cementation, is a promising bio-mediated technology that can improve the engineering properties of soils through the precipitation of calcium carbonate. Despite significant advances …
View article: Centrifuge Modeling of Variable-Rate Cone Penetration in Low-Plasticity Silts
Centrifuge Modeling of Variable-Rate Cone Penetration in Low-Plasticity Silts Open
The effects of soil plasticity and penetration rate on cone penetration resistance in low-plasticity fine-grained soils are evaluated. A series of centrifuge tests with in-flight variable rate cone penetration soundings was performed on mo…
View article: Biogeochemical Changes During Bio-cementation Mediated by Stimulated and Augmented Ureolytic Microorganisms
Biogeochemical Changes During Bio-cementation Mediated by Stimulated and Augmented Ureolytic Microorganisms Open
Microbially Induced Calcite Precipitation (MICP) is a bio-mediated cementation process that can improve the engineering properties of granular soils through the precipitation of calcite. The process is made possible by soil microorganisms …
View article: A microfluidic chip and its use in characterising the particle-scale behaviour of Microbial-Induced Calcium Carbonate Precipitation (MICP)
A microfluidic chip and its use in characterising the particle-scale behaviour of Microbial-Induced Calcium Carbonate Precipitation (MICP) Open
Microbial-induced calcium carbonate precipitation (MICP) is an innovative ground improvement technique which can enhance the strength and stiffness of soils and can also control their hydraulic conductivity. These engineering properties of…
View article: Large‐Scale Experiments in Microbially Induced Calcite Precipitation (MICP): Reactive Transport Model Development and Prediction
Large‐Scale Experiments in Microbially Induced Calcite Precipitation (MICP): Reactive Transport Model Development and Prediction Open
Design of in situ microbially induced calcite precipitation (MICP) strategies relies on a predictive capability. To date much of the mathematical modeling of MICP has focused on small‐scale experiments and/or one‐dimensional flow in porous…
View article: Cyclic Loading Response of Silt with Multiple Loading Events
Cyclic Loading Response of Silt with Multiple Loading Events Open
The evolution of cyclic resistance with multiple loading events is evaluated for nonplastic and low-plasticity silts with plasticity indices of 0 and 6, respectively. A series of direct simple shear tests with multiple cyclic loading and r…
View article: Ottawa F-65 Sand Data from Ana Maria Parra Bastidas
Ottawa F-65 Sand Data from Ana Maria Parra Bastidas Open
Characterization of Ottawa F-65 sand performed by Ana Maria Parra Bastidas.
View article: The role of root development of <i>Avena fatua</i> in conferring soil strength
The role of root development of <i>Avena fatua</i> in conferring soil strength Open
• Premise of the study: Roots play an important role in strengthening and stabilizing soils. Existing models predict that tensile strength and root abundance are primary factors that strengthen soil. This study quantified how both factors …