numerical modeling of concrete flow in drilled shaft

Numerical Modeling of Concrete Flow in Drilled Shaft

Oct 17, 2018  Numerical Modeling of Concrete Flow in Drilled Shaft Jesudoss Asirvatham Jeyaraj University of South Florida, [email protected] Follow this and additional works at:https://scholarcommons.usf/etd Part of theCivil Engineering Commons This Dissertation is brought to you for free and open access by the Graduate School at Scholar Commons.

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Numerical Modeling of Concrete Flow in Drilled Shaft

Key words: Drilled shaft, concrete flow, modeling of drilled shaft, COMSOL Multiphysics® When the excavation is advancing, the drilling fluid 1.0 Introduction Drilled shafts are cylindrical, cast-in-place concrete, deep foundation elements used for heavy structures

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"Numerical Modeling of Concrete Flow in Drilled Shaft" by ...

Drilled shafts are cylindrical, cast-in-place concrete deep foundation elements. Their construction involves drilled excavation of soil or rock using large diameter augers, and placement of the necessary reinforcing steel in the excavation followed by concreting. Where a high water table is encountered, drilling slurry is used to support the excavation walls and concreting is tremie-placed.

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NUMERICAL MODELING OF CONCRETE FLOW IN DRILLED

NUMERICAL MODELING OF CONCRETE FLOW IN DRILLED SHAFT • In drilled shaft, the quality control is based on empirical type workability tests. • No rheological evaluation of concrete is done for drilled shaft. • Drilled shaft size, rebar size and rebar arrangement are not considered. •

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Numerical Modeling of Concrete Flow in Drilled Shaft ...

Numerical Modeling of Concrete Flow in Drilled Shaft Construction. Drilled shafts are cylindrical, cast-in-place concrete deep foundation elements used for heavy structures such as highway bridges and tall buildings. Construction involves drilled excavation of soil or rock using large diameter augers to form a deep cylindrical void, placement ...

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Numerical Modeling of Concrete Flow in Drilled Shaft - CORE

As a precursor to 3-D modeling, 2-D CFD modeling is carried out using COMSOL Multiphysics. In both 2-D and 3-D models, the Volume of Fluid method is used for computing the motion of the interface between the concrete and the drilling slurry. The models predict the flow patterns and volume fraction of concrete and slurry.

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Numerical Modeling of Concrete Flow in Drilled Shaft ...

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Numerical Modeling of Concrete Flow in Drilled Shaft ...

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Refined numerical modeling of a laterally-loaded drilled ...

Apr 01, 2013  The geometry of the numerical model of the Shaft B section is shown in Fig. 1, which was modified from the model used by Huang et al. (2011).The drilled shaft was located at the mid-width of the test section, i.e., along the centerline of the test section.

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DRILLED SHAFTS

What is a Drilled Shaft? Drilled shafts require rigorous inspection. Initial plan review is a must. Should read Section 465 of Standard Specs to clearly understand different types of shaft construction. Need to become familiar with procedures in the specs in event problems are encountered.

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Numerical Modeling of Concrete Flow in Drilled Shaft - CORE

As a precursor to 3-D modeling, 2-D CFD modeling is carried out using COMSOL Multiphysics. In both 2-D and 3-D models, the Volume of Fluid method is used for computing the motion of the interface between the concrete and the drilling slurry. The models predict the flow patterns and volume fraction of concrete and slurry.

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Analyzing Concrete Flow in Drilled Shafts with CFD ...

Nov 10, 2017  On the other hand, the Newtonian simulations show a difference of 0.90 meters (36 inches), which is higher than the observed range. Thus, the non-Newtonian flow model is more appropriate for this concrete flow simulation and demonstrates that simulation can successfully calculate the concrete head differential in a drilled shaft.

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Attenuating Mass Concrete Effects in Drilled Shafts

The proposed research will undertake: (1) field temperature measurements of mass concrete structures with specific interest on drilled shafts (but not limited to) using the new thermal integrity probe, (2) numerical thermal modeling to verify the anticipated temperature response within a drilled shaft or mass concrete structure, (3 ...

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Strut-and-Tie Modeling and Design of Drilled Shaft Footings

Finite element modeling of drilled shaft footings to complement the experimental study. The numerical models will be validated with test results and will be used to investigate the flow of forces in the footing.

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Experimental study, numerical modeling of and axial ...

May 30, 2013  The pressure grouting of drilled shaft tips has become popular worldwide due to its effectiveness in mobilizing a larger portion of the available tip resistance under service displacements. This paper presents experimental and numerical studies on the load transfer mechanism and factors controlling the axial response of base grouted drilled shafts in cohesionless soils.

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Controlling Mass Concrete Effects in Large-Diameter ...

diameter shaft cast with a 3.8 ft (1.17 m) diameter central void for the express purpose of mitigating mass concrete temperature distributions in large-diameter drilled shafts. Focus is given to the construction, field measurements, and numerical model calibration. Complete details of the entire study can be found in Mullins et al.10

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Effect of Verification Cores on Tip Capacity of Drilled Shafts

When shales are first dried and then rewetted and concrete is poured in the wet, the verification core hole reduces tip capacity by a maximum of 10% (14% for Taylor Marl). In all other cases, the verification core does not decrease the tip capacity. 17. Key Words Drilled shafts; clay shales; verification core; concrete flow. 18. Distribution ...

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Numerical Study of an Integral Abutment Bridge Supported ...

Measured drilled shaft axial loads were higher than the FEM values mainly due to differences between the assumed and actual axial stiffness and to a lesser extent on concrete creep in the drilled shafts and uneven distribution of loads among drilled shafts. Numerical simulations of thermal and stream loadings were also performed on this IAB.

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Aspects of Structural Design of Drilled Shafts for Flexure ...

Apr 26, 2012  A numerical model was selected, verified and calibrated against data obtained from an experimental study that addressed the effect of various types of various minor structural flaws on the flexural strength of drilled shafts. The adopted numerical model, after calibration, reproduced moment capacities for the tested shaft specimens with ...

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Interaction of Drilled Shafts with Rock Masses - ScienceDirect

Jan 01, 2015  In the paper the Analysis of the Interaction of Drilled Shafts with soft and middle strength Rock Masses is con-sidered. The Analysis is based on results of three dimensional numerical modeling of the behavior of drilled shafts under normal compression loads. Factor dependences (regression equations) for calculations of values of shafts bearing ...

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A numerical and experimental study of bearing stiffness of ...

Jan 01, 2012  The boundaries of the prototype FEA models are meshed by the dimensions of 3 times the shaft diameter (3D) wide and of shaft length (L) plus 3D below the shaft tip. An element size of 0.5 ft by 0.5 ft (0.1524 m by 0.1524 m) on the axisymmetry plane is used in the discretization of a synthetic homogenous limestone rock.

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LATERAL PERFORMANCE OF DRILLED SHAFT

real behavior of drilled shaft subjected to lateral load. The numerical results show that the nonlinearity of material and geometry strongly affects the shaft deflection, steel stress distribution, concrete cracking state, soil uplift in front of the shaft, and separation between shaft/soil interfaces that is behind the shaft and along its depth.

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An Evaluation of the Use of Self-Consolidating Concrete ...

Corpus ID: 112922722. An Evaluation of the Use of Self-Consolidating Concrete (SCC) for Drilled Shaft Applications @inproceedings{Bailey2005AnEO, title={An Evaluation of the Use of Self-Consolidating Concrete (SCC) for Drilled Shaft Applications}, author={J. Bailey}, year={2005} }

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Drilled shafts under combined axial and lateral loads

__drilled_shaft pps Figure 6.8 Numerical model for shaft wall resistance T-l field test 80 The material properties used in the numerical model were obtained from field and laboratory tests results and are shown in Table 6.1. The diameter of the borehole was overdrilled from the ground surface down to a depth of 4.5 meters, 1.8 meters into the

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DRILLED SHAFT CONSTRUCTION POLICY CHANGES

Evaluation and Guidance Development for Post- Grouted Drilled Shafts for Highways (FHWA- HIF-017-024) ... of steel for the full length of the shaft Concrete pour requirements ... Effort is underway using numerical models and laboratory scale testing. POST-GROUTING OF DRILLED SHAFTS FOR HIGHWAYS (FHWA-HIF-17-024) ...

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Attenuating Mass Concrete Effects in Drilled Shafts

The proposed research will undertake: (1) field temperature measurements of mass concrete structures with specific interest on drilled shafts (but not limited to) using the new thermal integrity probe, (2) numerical thermal modeling to verify the anticipated temperature response within a drilled shaft or mass concrete structure, (3 ...

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LATERAL PERFORMANCE OF DRILLED SHAFT

real behavior of drilled shaft subjected to lateral load. The numerical results show that the nonlinearity of material and geometry strongly affects the shaft deflection, steel stress distribution, concrete cracking state, soil uplift in front of the shaft, and separation between shaft/soil interfaces that is behind the shaft and along its depth.

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DRILLED SHAFT CONSTRUCTION POLICY CHANGES

Effort is underway using numerical models and laboratory scale testing. POST-GROUTING OF DRILLED SHAFTS FOR HIGHWAYS (FHWA-HIF-17-024) ... (flow meter, strokes, cement) Grout pressure (gauges, transducers) (at pump) ... Quality Assurance of Post-Grouted Drilled Shaft Foundations University of Missouri Thermal Integrity Testing (TIP) for Drilled ...

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Effect of the Non-Linear Behavior of Pile Material on the ...

NUMERICAL MODELS OF PILE/DRILLED SHAFT MATERIALS In order to incorporate the effect of material nonlinearity, numerical material models should be employed in the analysis of the laterally loaded pile/shaft. A unified stress-strain approach for confined concrete has been employed with the

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Drilled shafts under combined axial and lateral loads

__drilled_shaft pps Figure 6.8 Numerical model for shaft wall resistance T-l field test 80 The material properties used in the numerical model were obtained from field and laboratory tests results and are shown in Table 6.1. The diameter of the borehole was overdrilled from the ground surface down to a depth of 4.5 meters, 1.8 meters into the

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Guide to Tremie Concrete for Deep Foundations

Bingham fluid model A two parameter rheological model of a fluid with non-zero yield stress and a constant plastic viscosity. bleeding Form of segregation in which some of the water in the concrete mix tends to rise to the surface of freshly placed concrete. bored pile (drilled shaft or caisson)

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Thermal Integrity Testing of Drilled Shafts

The objectives included (1) field temperature measurements of mass concrete structures with specific interest in drilled shafts and (2) numerical modeling to verify the anticipated temperature response within a drilled shaft or mass concrete structure. Both small scale and full scale shafts were constructed and monitored during the curing ...

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US8206064B2 - Voided drilled shafts - Google Patents

A method of constructing a voided drilled shaft concrete structure is provided. Drilled shafts are large-diameter cast-in-place concrete structures that can generate extremely high temperatures during the concrete hydration/curing phase. The method includes creating an excavation, inserting a cage or an inner casing into the excavation, and filling with concrete the space between the outer ...

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Effects of Demolishing the Deep Excavation Support System ...

In this study, numerical modeling approach is used to evaluate the deformation of metro line during the demolition of the deep excavation support system. ... 8 drilled shafts with diameter 9.5 m and 16 drilled shafts with diameter 7.0 m were constructed below the foundation for the main ... The compressive strength of concrete used for the beam ...

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(PDF) 05 chapter 3 numerical modeling Aston Martin ...

05 chapter 3 numerical modeling. Download. 05 chapter 3 numerical modeling. Aston Martin. Related Papers. Creation of Computational Models of Cancellous Bone. By Jiří Valášek. NSCM-24 Proceedings. By shaoping bai. Elmer Models Manual. By Thomas Zwinger and Juha Ruokolainen.

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A Numerical Study On The Lateral Resistance Of Steel ...

Steel-concrete composite columns are popular for the superstructure of bridges, and the outer steel attached to the shaft increases the shaft resistance through confining the concrete. In this study, the lateral resistance of steel-concrete composite drilled shafts was evaluated quantitatively based on the numerical analysis. When steel casings ...

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SETTLEMENT ANALYSIS OF DRILLED SHAFT FOUNDATION

In this study, both analytical and numerical studies were conducted to investigate the effect of lime treatment on the settlement of the drilled shaft. Extensive literature study was conducted on analysis of axially-loaded drill shafts and novel chemical ground improvement techniques for

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Figure D.9 from Defining the Upper Viscosity Limit for ...

Corpus ID: 136655370. Defining the Upper Viscosity Limit for Mineral Slurries Used in Drilled Shaft Construction @inproceedings{Mullins2014DefiningTU, title={Defining the Upper Viscosity Limit for Mineral Slurries Used in Drilled Shaft Construction}, author={G. Mullins and Danny Winters and J. Bowen and K. Johnson and Vincent DePianta and Jeff Vomacka and Miles Mullins}, year={2014} }

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