OasisLMS

The present study conducts a comprehensive examination of the dynamic behavior of a mono-pile foundation across homogeneous soil and diverse layered soil-rock compositions when subjected to horizontal dynamic loads. The mono-pile is represented as a series of visco-elastic springs connected longitudinally, simulating its immersion in an elastic half space. Using spectral element formulation, we establish the frequency-dependent stiffness and damping characteristics of a mono-pile foundation embedded in layered elastic half space. We illustrate how stiffness and damping vary with frequency across different soil-rock configurations. The dynamic response of the pile is notably affected by the depth of the rock-socketed pile, with the presence of a firm rock layer underneath enhancing the overall system stiffness. We compute the frequency-amplitude responses of a mono-pile supporting a heavy mass block for both horizontal translation and rocking motion, considering the stiffness and damping variations under various soil-rock scenarios. The horizontal amplitude of the pile diminishes as the depth of pile rock socketing increases, while resonant amplitudes for rocking motion rise with deeper pile rock socketing. Lastly, we explore changes in natural frequency and peak amplitudes across varied pile slenderness ratios under different pile-soil-rock conditions.

Rishab Das, IIT | Delhi; Bappaditya Manna, IIT | Delhi; Arnab Banerjee, IIT | Delhi

International Conference Proceedings