Sarper Demirdogen’s Post

🌟 From Modified Cam-Clay to the Barcelona Basic Model: Expanding Horizons in Unsaturated Soil Modelling 🌟 Dear Colleagues, I hope this post finds you well! Continuing the challenge I started, today we dive into one of the pivotal advancements in geotechnical modeling – the evolution of the Modified Cam-Clay (MCC) model into the Barcelona Basic Model (BBM) for unsaturated soils. 🔍 Why the Transition from MCC to BBM? The Modified Cam-Clay model is a widely used framework for saturated soils, but when it comes to unsaturated soils, it falls short in capturing critical factors like suction and the degree of saturation. That's where the Barcelona Basic Model comes into play. 🚀 Key Changes: What Makes BBM Different? The BBM introduces several modifications to extend the MCC model for unsaturated conditions: Incorporation of Suction: Unlike MCC, BBM uses suction as a key variable, influencing the soil's mechanical behavior. Net Stress Concept: BBM works with net stress (total stress minus air pressure), making it more suitable for partially saturated soils. Suction-Dependent Yield Surface: The yield surface in BBM evolves not only with plastic strains but also with changes in suction. This allows us to model phenomena like wetting-induced collapse or drying-induced hardening. Loading-Collapse Surface: BBM adds a special yield surface to account for soil collapse when suction is reduced under constant load – a crucial factor in predicting soil stability. Coupling with Water Retention: By linking the model to a Water Retention Curve, BBM captures the relationship between suction and the degree of saturation, enhancing predictions for unsaturated soil behavior. 📈 Why is This Important? BBM’s ability to simulate the behavior of unsaturated soils opens up possibilities for improving the design and analysis of: Unsaturated Slopes: Where rainfall can cause instability. Clay Barriers: Especially in environmental engineering applications like landfills. Foundations on Unsaturated Soils: Helping us better predict settlement and heave. 💡 Moving Forward This transition from MCC to BBM marks a major step in unsaturated soil mechanics. I invite fellow engineers and researchers to join the conversation—what are your experiences with these models? How do you tackle the challenges of unsaturated soils in your projects? 💬 Let's Collaborate: Feel free to connect and discuss more about the exciting developments in geotechnical engineering, soil modeling, and Python-based solutions! Kind regards #GeotechnicalEngineering #CivilEngineering #SoilMechanics #BBM #constitutivemodels #UnsaturatedSoils #Python #Engineering #Research #Innovation #STEM

Arghya Kamal Chatterjee from Stratum Logics will present "Efficacy of geocell modulus in reducing dynamic load factor on railway track subjected to freeze-thaw" at the 2nd Canadian & Cold Regions Rail Research Conference (CCRC 2024)! His co-authors include Sanat Pokharel, P.Eng., from Stratum Logics and Marc Breault from Paradox Access Solutions Inc. The Canadian Rail Research Laboratory will host this conference April 9-10 at the University of Alberta. See the draft agenda and register today at https://lnkd.in/e3BtYF7x! ABSTRACT: For a reliable railway track operation in cold climate, an effective load transfer mechanism from ballast and sub-ballast layers is required so that the vibration, bearing capacity of sub-soil, and the track settlement problems that ultimately cause track failure are minimized for safe operations. The railway traffic load transferred to the embankment is calculated as the effective static load scaled up by a dynamic load factor (DLF) that accounts for the impacts from variable velocity and deceleration from breaking. While some design methodologies proportion the DLF to the design velocity of the train, other research indicate the influence of track modulus is important. In cold climate regions, where the ground is subject to freeze-thaw cycles, there is a tendency to lose the effective stiffness of the railway embankment during thawing inviting higher DLF. This increase in DLF from the decrease in supporting soil modulus with time is not accounted for in current design practices. Additionally, the variance of stiffness along the track does call for higher DLF. Geosynthetic soil reinforcement not only increases the track modulus multifold, but as indicated in recent research, it also minimizes the loss of layer modulus caused by freeze-thaw cycles by at least 34%, thus, effectively reducing the design DLF value and its uncertainty. This paper establishes guidelines in consideration for the DLF for rail track embankments reinforced with high-modulus geocell subject to freeze-thaw cycles. The geocell reinforcement also minimizes the uncertainty of stiffness variance and reduces the loss of track modulus. The theoretical study completed through this paper shows that the DLF can be reduced by at least 6.3% (at 40 kmph velocity with concrete ties) with the use of high-strength polymeric geocell reinforcement and the increase of DLF with thaw-softening is minimized significantly. A case of design implementation is also discussed. #canada #transportation #engineering #climatechange #resiliency #innovation #coldregions #railwayengineering #railways #railwaynews #railsafety #railsystems #research #recherche #railindustry #railnews #ccrc2024

Calling all #geotechnicalengineers! Are you wondering why to Model PVDs in #PLAXIS? Are you interested in what are the keys steps in #PVDs modelling? Look no further, bookmark and register to the episodes of our new soil Improvement Series: #Your_Guide_for_Soil_Improvement_with_PLAXIS 🏗️💡 Prefabricated Vertical Drains (PVDs) are essential tools in geotechnical engineering, particularly for improving the properties of soft soils. By facilitating drainage and accelerating consolidation, PVDs play a critical role in the stability and settlement of soil. The use of PLAXIS software for modelling drains allows engineers to predict and analyse their behaviour effectively. Moreover, the efficiency of PVDs can be significantly enhanced by applying techniques like #vacuumconsolidation, which can also be modelled in PLAXIS. Blog 2 of the new soil Improvement Series, that was prepared by our expert Richard Witasse and will be available on the 13th of November, will guide you through the process of modelling PVDs in PLAXIS, covering key aspects such as: 1️⃣  Geometry setup 2️⃣  Material properties 3️⃣  Boundary conditions 4️⃣ Result interpretation ✅ Link: https://lnkd.in/dCGeRd54 ✅ Don’t miss this opportunity to unlock the potential of PLAXIS for soil improvement and elevate your geotechnical modelling skills!! Special thanks go to: - Richard Witasse Wittase - Principal Product Manager, Geotechnical in Bentley Systems For more PLAXIS tips and updates, follow me and hit that notification bell! 🔔 #geotechnicalengineering #civilengineering #finiteelementanalysis #bentleysystems #infrastructure #transportation Andrea Rosato Ahmed Said Gad Rohan Deshmukh, PhD 🔴 References Chai, J.C., Shen, S.L., Miura, N. and Bergado, D.T. (2001)., Simple method of modelling PVD improved subsoil. Journal of Geotechnical Engineering, ASCE, 127(11), 965-972. Hird, C.C., Pyrah, I.C., and Russell, D. (1992). Finite element modelling of vertical drains beneath embankments on soft ground. Géotechnique, 42(3): 499–511. Indraratna, B., Sathananthan, I., Bamunawita, C. and Balasubramaniam, A.S. (2005)., Theoretical and numerical perspectives and field observations for the design and performance evaluation of embankments constructed on soft marine clay, Ground Improvement, Elsevier, 199-230.

Calling all #geotechnicalengineers! Are you interested in optimizing soil improvement? Are you searching for info on modelling PVDs and column-based soil improvement in #PLAXIS? Are Rigid inclusions, consolidation, embedded beam element and calibration of your point of interest? Look no further, bookmark and register to the episodes of our new soil Improvement Series: #Your_Guide_for_Soil_Improvement_with_PLAXIS 🏗️💡 Geotechnical engineers face complex challenges when optimizing soil improvement techniques, which are crucial for enhancing soil strength, reducing settlements, controlling water flow, and improving stability. Accurate simulations of soil-structure interaction, consolidation, advanced material behaviour and structural elements are essential for techniques like preloading, surcharging, compaction, and stabilization. To handle these demands, a powerful Finite Element Analysis (FEA) tool is needed. PLAXIS offers robust functionalities to support precise simulation of these techniques, enabling engineers to confidently address soil improvement projects. In this series, we’ll explore and highlight how PLAXIS can help you effectively tackle your soil improvement projects with precision and confidence. 🔴 The Soil improvement series will consist of 4 episodes: 1️⃣ Ep. 1 – Blog: Optimizing Soil Improvement with PLAXIS: Techniques and Benefits by Richard Witasse – Available   2️⃣ Ep. 2 – Blog: Modelling Prefabricated Vertical Drains using PLAXIS by Richard Witasse – Available November 13th   3️⃣ Ep. 3 – Blog: Column-Based Soil Improvement Modelling with PLAXIS  by Richard Witasse – Available November 20h   4️⃣ Ep. 4 – Online Session: Efficient Soil Improvement Modelling with PLAXIS by Richard Witasse and Jérôme RACINAIS – Available for registration    By registering for the online session, you will receive PLAXIS Soil Improvement practical examples (model files + description). Don’t miss this opportunity to unlock the potential of PLAXIS for soil improvement and elevate your geotechnical modelling skills! ✅ Register now: https://lnkd.in/dCGeRd54 ✅ Special thanks go to: - Richard Wittase - Principal Product Manager in Bentley Systems - Jerome Racinais - Engineering director of Menard France )  For more PLAXIS tips and updates, follow me and hit that notification bell! 🔔 #geotechnicalengineering #civilengineering #finiteelementanalysis #bentleysystems #infrastructure #transportation

Abstract This paper assesses the reliability of landfill veneer cover systems against direct-sliding failure (DSF) and uplifted-floating failure (UFF) modes using the second-order reliability method (SORM). Variability in stability number due to cohesion, interface cohesion, friction angle, horizontal seismic acceleration coefficient, and phase changes are considered. Formulations for the first-order reliability method (FORM), SORM, and Monte Carlo simulations (MCS) are presented, with emphasis on the precision of SORM over FORM. A novel framework for system reliability–based design optimization (SRBDO) is introduced, addressing interdependencies between DSF and UFF modes. The results highlight the significant influence of the lowest component reliability index on system reliability. For the given design conditions, the system reliability index is obtained as 1.55, significantly influenced by the component reliability indices of 1.55 and 9.29. In addition, this study provides a comparative analysis of reliability indices obtained using SORM for static, pseudostatic (PS), and pseudodynamic (PD) methods. Moreover, system reliability–based design charts are generated to estimate allowable cover soil thickness to ensure concurrent reliability in DSF and UFF modes. It is noted that an increase in the value of the horizontal seismic acceleration coefficient from 0 to 0.30 results in a 77.27% increase in the allowable thickness of cover soil. https://lnkd.in/gFiaAKbJ

Shedding light on the intricacies of numerical simulations of soil behavior . A solid understanding of soil mechanics and behavior is one of the fundamental pillars of geotechnical engineering. The stability and resilience of many modern geotechnical structures, including building foundations, dams, bridges, and embankments, rely on appropriate modeling based on accurate measurements of soil properties. #TechTrends #TechInnovationsDaily #DigitalFrontiers #FutureTechInsights

FAQ on the Lifespan of Geomembranes

Calling all #geotechnicalengineers! Are you interested in #soilimprovement with #PLAXIS? Are #Rigidinclusions, Prefabricated vertical drains #pvd and #consolidation of your point of interest? Join us in our live online session about Efficient Soil Improvement Modelling with PLAXIS This online session is a part of the Series: Your Guide for Soil Improvement with PLAXIS. The mentioned series will consist of the mentioned session and 3 blog articles about: Soil improvement with PLAXIS, PVD and column-based soil improvement. By registering for the online session, you will receive PLAXIS Soil Improvement practical examples (model files + description). Our experts Richard Witasse and Jérôme RACINAIS (Engineering director of Menard France ) will highlight : 1️⃣ Unit cell model definition and calibration 2️⃣ How to model PVD drains in PLAXIS 3️⃣ The use of embedded beam element for modelling rigid inclusions 4️⃣ Efficiently running consolidation analysis in PLAXIS Don’t miss this opportunity to unlock the potential of PLAXIS for soil improvement and elevate your geotechnical modelling skills! 🔴 Register now: https://lnkd.in/dCGeRd54 🔴 Special thanks go to: - Richard Witasse - Jérôme RACINAIS For more PLAXIS tips and updates, follow me and hit that notification bell! 🔔 #geotechnicalengineering #civilengineering #finiteelementanalysis #bentleysystems #infrastructure #transportation Andrea Rosato Ahmed Said Gad Rohan Deshmukh, PhD

The benefits of geomorphic design! - Optimised materials movement: Reduce closure costs by efficiently managing up to 80% of material movement. - Sustainable rehabilitation: Implement designs that ensure long-term environmental stability and reduce ecological impact. - Enhanced project efficiency: Benefit from detailed landform designs and predictive simulations for smarter backfill planning. - Reduced erosion and recharge issues: Address erosion evolution and manage recharge effectively with our cutting-edge modelling. #geomorphicdesign #sustainableengineering #minelock #projectoptimisation #environmentalbenefits #engineeringexcellence #innovativesolutions

Finite difference approach to the analysis of flow nets. #geotechnicalengineering #geotechnics #engineering #geotechnica #construction #civildesigns #civilengineering #structville https://lnkd.in/dfb_5Udh