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    Global FEM Online Workshop Series 2025 Global and Local Slope Stability

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    AI Summary
    • Compares Limit Equilibrium Method (LEM) and Strength Reduction Method (SRM) for slope stability evaluation.
    • Demonstrates Strength Reduction Method-based slope stability analysis in MIDAS GTS NX.
    • Covers construction stage analysis and CAD file import for realistic modeling workflows.
    • Explores stabilization techniques such as soil nailing and anchoring within numerical modeling contexts.
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    What You'll Take Away

    Numerical modelling techniques for Slope Stability Analysis

    Description

    Slope stability analysis is a critical component of major infrastructure projects, especially for highways, railways, and canals. Ensuring slope stability is essential for both safety and cost-effective embankment design. Commonly adopted methods include the Limit Equilibrium Method (LEM) and the Strength Reduction Method (SRM). For slope stabilization and protection, techniques such as soil nailing and anchoring are widely used.

    This webinar provides a theoretical overview of slope stability analysis methods and demonstrates the capabilities of MIDAS GTS NX in this domain. Key features such as import of CAD file, construction stage analysis, and Strength Reduction Method-based slope stability analysis will be covered.

     

    Who Should Attend

    • Geotechnical Engineers involved in highway, railway projects

    • Researchers and Academicians involved in numerical modelling

    • Engineering Consultants involved in earthen embankment projects

     

     

    Why Should Join 

    • Understand difference between Limit Equilibrium Method and Finite Element Analysis

    • Understand the local and global slope analysis

    • Gain insights about numerical modeling of slope stability analysis

     

    Related MIDAS Software

     

     🚩 Check the Q&A highlights below for the speaker’s answers from the live session. 

    Speaker

    Dr. Praveen Huded Geotechnical Engineer MIDAS IT
    Dr. Praveen Huded is a geotechnical engineer with expertise in the analysis and design of pile foundations in liquefiable soils and seismic hazard assessment. At MIDAS, he is responsible for developing and validating numerical models, delivering customized simulation-based solutions to clients.
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    FAQs

    Tech Q1. In SRM analysis, how are soil parameters reduced for multiple layers? Expand or Collapse

    A. In the Strength Reduction Method (SRM), the shear strength parameters of all soil layers are reduced simultaneously, not layer by layer. The reduction is applied consistently across cohesion (c), friction angle (φ), and dilatancy angle.

    The reduction is governed by the Strength Reduction Factor (SRF) as follows:

    • cf=cSRFc_f = \dfrac{c}{SRF}cf=SRFc
    • ϕf=tan⁡−1(tan⁡ϕSRF)\phi_f = \tan^{-1}\left(\dfrac{\tan \phi}{SRF}\right)ϕf=tan−1(SRFtanϕ)

    This means both c and φ are reduced together at each SRF step, maintaining the Mohr–Coulomb relationship:

    • τ=c+σntan⁡ϕ\tau = c + \sigma_n \tan \phiτ=c+σntanϕ

    During analysis, SRF is gradually increased until the model fails to converge. The maximum SRF before non-convergence is taken as the factor of safety.

    Note that the final safety factor may vary slightly depending on convergence criteria and numerical settings.

    Tech Q2. What is reason for SRM inclusion boundary condition. Is it to have local fs from SRM method? Expand or Collapse
    A. Yes, That is correct.
    Tech Q3. How will overburden gets defined? Expand or Collapse
    A. You can either model them as a soil/rock layer with appropriate unit weight using a solid/plane strain elements or to simplify, we can input that as a load/pressure.
    Tech Q4. Can I get per-slice free-body diagrams (FBDs) and slice forces in the LEM module? Expand or Collapse
    A. Yes. The LEM module in GTS NX can display per-slice FBDs and report slice-level quantities (e.g., slice weight, base/side normal and shear forces, interslice forces, and pore pressure). Results can be reviewed on screen and exported for documentation.
    Tech Q5. In SRM, how are c and φ reduced, and can the factor of safety be < 1.0? Expand or Collapse
    A. In GTS NX, the Strength Reduction Method (SRM) scales shear-strength parameters simultaneously—typically reducing c′ and tan φ′ by a trial factor F until a global failure criterion is met.The reported FoS is not constrained to ≥ 1.0; if the model is already unstable at unreduced strength, the solution may converge to FoS < 1.0. The initial trial factor defaults to 1.0 but can be adjusted in the SRM analysis controls. (Follow your project specifications for the exact reduction scheme.)
    Tech Q6. How do I model slope-stabilization measures (soil nails, shotcrete, geogrids, micropiles, retaining walls) in GTS NX? Expand or Collapse
    A.
    1. Soil nails / rock bolts: use truss/cable-type elements; include interface or bond-slip properties where applicable.
    2. Shotcrete lining: use beam/plate (2D) or shell (3D) elements; couple to the ground with appropriate contact/interface.
    3. Geogrids/geonets: use the dedicated Geogrid element with tensile stiffness and pull-out parameters.
    4. Micropiles / retaining walls: in 2D, beam elements are common; in 3D, use beam or solid depending on slenderness and detailing.
    Always verify stiffness, connection, and construction-stage activation with your design code.
    Tech Q7. If unsaturated-soil parameters aren’t lab-tested, can I estimate them from particle-size distribution (and does GTS NX help)? Expand or Collapse
    A. Yes, for preliminary work. GTS NX provides correlations/estimation tools that can derive unsaturated properties from particle-size distribution data. Such estimates are industry-accepted for screening studies, but laboratory-derived SWCC/unsaturated parameters are preferred for design. Calibrate with site data whenever possible.
    Tech Q8. How should porous (drain) concrete be represented—beam, shell, or solid—and what are the hydraulic/mechanical implications? Expand or Collapse
    A. Choose the structural element type by slenderness/geometry:
    Beam for slender members; shell for thin walls; solid for non-slender blocks.For hydraulic behavior, beams do not convey flow. If you must model seepage through the porous medium (e.g., drain layers), represent it with shell/solid elements assigned permeability and appropriate boundary conditions. If only mechanical effects are needed, a structural element without flow may suffice.
    Tech Q9. When should I use anisotropic permeability instead of isotropic? Expand or Collapse
    A.Use anisotropic permeability when field/lab evidence indicates directional flow behavior—e.g., bedded/laminated soils, foliated rock, jointed masses, layering parallel to slope, or consolidation/drainage problems where kv ≠ kh governs dissipation. If data are unavailable, start with isotropic values, then run sensitivity checks and adopt anisotropy when justified by tests or site characterization.
    General Q1. Is this training program free of charge? Expand or Collapse
    A. Yes! The Global Geotechnical Webinar Series 2025 is completely free of charge. Once registered, you’ll get access to all live and on-demand sessions, expert talks, hands-on tasks, and learning materials — at no cost.
    General Q2. How do I get the training license? Expand or Collapse
    A. Trial licenses for GTS NX and FEA NX are provided only to registered participants. You can find free trial information in the register confirmation email. If you can't find in your inbox, please contact us via the below link :
    🔗 Click
    General Q3. Where can I get the assignment files and how should I submit them? Expand or Collapse
    A. You can download the assignment files from the button at the top of the page labeled [Assignment (Model & Tutorial)], and they will also be sent via email after the webinar ends.Once completed, please submit your assignments through the form link below.
    General Q4. How can I ask a question to MIDAS experts? Expand or Collapse
    A. Please submit your question using the form below. One of our technical experts/regional manager will get back to you shortly.
    🔗 Submit Your Inquiry(Assignment/Technical)
    🔗 Submit Your Inquiry (Product/Purchase)
    General Q5. How can I receive the certificate of completion? Expand or Collapse
    A. To be eligible for the certificate, please make sure to:
    ✅ Attend at least 2 live sessions
    ✅ Submit 2 or more assignments by October 8
    Certificates will be emailed to qualified participants on October 15, 2025.