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    Stage-by-Stage Analysis of Soil–Structure Interaction and Dewatering Effects Top-Down Modeling of Deep Excavations

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    AI Summary

     This session explores a practical top-down modelling approach for deep excavation projects, focusing on how staged construction, support systems, groundwater drawdown, and soil–structure interaction influence excavation performance. Through a 2D deep excavation model in MIDAS GTS NX, we demonstrate how retaining walls, king posts, struts, anchors, and interface elements can be activated step by step to reflect the actual construction sequence. The session also highlights the use of coupled stress–seepage analysis to assess wall deformation, structural forces, formation heave, settlement behavior, pore pressure changes, and seepage effects. Participants will gain practical guidance on building a realistic excavation model and interpreting key results for safe and reliable underground construction analysis. 

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    Description

    In this session, we will present a top-down modelling approach for deep excavation projects, focusing on a 2D plane strain excavation model that reflects a realistic staged construction sequence. The model includes retaining walls, king posts, struts, ground anchors, interface elements, and staged groundwater drawdown to represent the key mechanisms involved in deep excavation works.

     

    The session will highlight the construction stage sequence from initial stress generation to final excavation, including support installation, dewatering stages, and coupled stress–seepage analysis. Attendees will gain practical insight into how MIDAS GTS NX can be used to evaluate wall deflection, bending moments, axial forces in supports, basal heave, ground settlement, pore pressure distribution, and soil–structure interaction for safe and reliable deep excavation analysis.

    Key Points

    Stage-by-Stage Top-Down Excavation ModellingExplore how the top-down construction sequence can be simulated through staged excavation, support installation, and progressive activation of structural elements.

    Coupled Stress–Seepage Analysis with DewateringUnderstand how groundwater drawdown, pore pressure changes, and seepage effects can be considered together with stress analysis during deep excavation stages.

    Soil–Structure Interaction with Retaining SystemsLearn how retaining walls, king posts, struts, ground anchors, and interface elements work together to represent realistic interaction between the ground and support system.

    Excavation Performance and Stability EvaluationSee how MIDAS GTS NX can be used to evaluate wall deflection, bending moments, support axial forces, basal heave, settlement behavior, pore pressure distribution, and overall excavation stability.

    Speaker

    Abhishek Dixit Geotechnical Engineer MIDAS R&D Center Pvt. Ltd
    Abhishek Dixit is a Geotechnical Engineer in the Technical Support Team at MIDAS Research and Development Centre Pvt. Ltd., where he provides advanced technical assistance and engineering solutions for the MIDAS suite of geotechnical analysis software, including GTS NX and FEA NX. His expertise spans foundation dynamics, computational geomechanics, and seismic soil–structure interaction, bridging the gap between geotechnical design principles and simulation-driven analysis. He holds a Ph.D. in Foundation Dynamics and Geotechnical Earthquake Engineering from Shiv Nadar Institution of Eminence, Delhi NCR, where his research focused on developing a simplified nonlinear spring model that incorporates soil and interface nonlinearity to predict the lateral, cyclic, and seismic response of caisson foundations. His doctoral work has resulted in several SCI- and Scopus-indexed publications, including papers in the ASCE International Journal of Geomechanics and Springer’s Indian Geotechnical Journal.
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