Manual and Closed-Form Solutions vs. Numerical Modelling: Advantages and Challenges | OnDemand

There are situations in day-to-day engineering problems which can only be treated using conventional methods. On the other hand, there are specific engineering problems which can only be addressed using numerical modelling. In this webinar, Mohammad Tavakol from Terraprobe will share his experience using PLAXIS 2D as a powerful computer software in several geotechnical and geostructural projects. Part of this experience will include what advantages using PLAXIS will offer over manual calculations.

- Numerical Modelling advantages over the manual calculations and closed-form solutions
- Challenges in use of numerical modelling

Numerical Analysis of Seepage and Stability of a Tailings Dam | OnDemand

To calculate the stability of a tailings dam requires an accurate determination of the effective stresses within the dam. The first portion of the presentation discusses the complexities of analysis of seepage through a multi-layer dam. For the dam analyzed, Geocomp had the benefit of multiple piezometers measurements to calibrate the model. The second portion of the presentation demonstrates the application of the SHANSEP model to create an undrained strength profile of the tailings using effective stresses and undrained strength ratios measured in the laboratory. Once the SHANSEP strengths are calculated, a C-Phi reduction is performed to calculate the undrained strength Factor of Safety of the dam. Using the methods presented, it is possible to evaluate the impacts on stability of changes in pore pressures within the dam.

Calf Robe Bridge Temporary Abutment Stabilization | OnDemand

North American firm GeoStabilization International used PLAXIS 2D for a 2D soil-structure interaction project. The model includes existing H-Pile sections at the bridge abutment. These elements were modelled as embedded beam rows. The concrete occupying the bridge deck and abutment was modelled with the concrete constitutive model in PLAXIS 2D. The shoring system was modelled as two elements: ground anchors as embedded beams and reinforced shotcrete as plates. Further, the model included drilled shafts which were modelled as embedded beam elements. To determine ultimate moment capacity of the shaft, as designed and installed by GSI, they used PLAXIS 3D to perform a pushover analysis. The shaft rebar cage was modelled with beam elements and the concrete volume for the shaft was modelled with the concrete constitutive model.

Dynamic FE Analysis to Evaluate the Seismic SSI Impacts of Bridge Abutments on Underlying Pipelines |


This presentation from a user with Ninyo & Moore covers the procedures employed in the seismic Finite Element Analysis (FEA) of a grade separation project and provides practical insight toward implementation and interpretation of such models. The grade separation project involved design and construction of a bridge with a structural system consisting of approach embankments, two abutments founded on groups of piles, and bents supported by single piers. In order to ensure the structural integrity of the underlying water feeder, a detailed finite element investigation was performed to assess the static and dynamic impacts of the bridge construction on the pipeline behavior. In particular, the effects of soil-abutment inertia interactions on the seismic response of feeder was studied through a direct numerical modeling approach. The following topics will be discussed during this webinar:

  • Development of the seismic model, including material properties, input motion characteristics, and boundary conditions
  • Application of different constitutive models in seismic modeling of granular deposits
  • Interpretation and post-processing the results of seismic FE modeling



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