
Project 1 - Deepankar Choudhury
- To evaluate various responses like displacement, stress, bending moment etc. for combined pile-raft foundation (CPRF) systems subjected to static and dynamic loads considering soil-structure interactions.
- CPRF to be used for nuclear structures and corresponding Indian soil data will be considered for selected GHAVP soil site, basic soil and seismic data will be provided by NPCIL.
- Foundation-soil interaction under static and dynamic loads will be analyzed numerically using finite difference approach.
- Possibility of soil liquefaction under dynamic loading and reduction in shear strength of soil in various terms like pore pressure ratio due to dynamic loadings will be computed.
- Interference effects between piles will be evaluated using soil-structure-soil interactions models.
- Application of computational geomechanics with minimum computational effort/time will be obtained.
- Compilation, comparison and validation of numerical results obtained in previous steps for various responses of CPRF subjected to static and dynamic loadings will be given.
- Complete new design guidelines for CPRF under seismic loading considering local soil-site response study and liquefaction by taking dynamic soil-structure interaction will be proposed.
Objectives :
- Free-field motion will be given by NPCIL. Based on that deconvolute to desired level and then to convolute the seismic motion at various depths of pile foundation. SHAKE and / or DEEPSOIL software will be used for getting one-dimensional seismic ground response to obtain the seismic motions at various design depths.
- Superstructure load also now to be taken in the numerical model with actual shapes to obtain effect of superstructure size and shape on foundation system.
- Based on obtained seismic ground response analysis, seismic design of CPRF will be started.
- Dynamic soil-structure interaction considering soil-pile interaction, pile-pile interaction, pile-raft interaction and raft-soil interaction will be carried out using numerical finite difference based analysis.
- Possible validation of results obtained in FLAC3D finite difference based numerical analysis will be done with available field / experimental / analytical data in literature, if any.
- Final design steps and complete design of CPRF system for nuclear structure at the site-specific condition for a given actual problem by NPCIL will be solved.
- Final report preparation will be done and recommendations will be provided for seismic design of CPRF considering soil-structure interactions and partial liquefaction.
Deliverables :