Modi, Suman Kumar and Murthy , V M S R and Raina , A K (2025) Influence of hydrodynamic factors on structural vibration induced due to underwater demolition blasts in an operational port: an analytical case study. Sādhanā, 50. ISSN 0256-2499

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Abstract

Demolition of concrete berth structures submerged underwater by controlled blasting is getting popular for port deepening and widening operations the world over, primarily, due to the short time frame required. Such demolition in close proximity of new berth structures is often associated with a major adverse impact such as structural vibration (measured as peak particle velocity), whose early prediction always helps in planning safe blast designs and protecting the structures. In this research, appropriate scaled distance parameter, relevant hydrodynamic parameters, namely, collar water cover to burden ratio, stiffness ratio and amplification factor are considered to develop a multilinear vibration predictor model using Response Surface Methodology (RSM). 33 trial blasts were recorded with structural vibrations ranging between 4.38 and 62 mm/s. Among influential parameters, scaled distance ranged between 3.41 and 18.61 kg/m0.33, stiffness ratios between 1.97 and 7.58, collar water cover to burden ratio between 0.38 and 22.64 and amplification factor from 0.16 to 1. The new prediction model based on selected hydrodynamic factors (HDF model) yielded a superior index of determination of 0.9 over cube root scaled distance model with 0.7. The error and variance factors have also confirmed its superiority. The developed HDF model is also validated using additional datasets. Interactive 3D surfaces were plotted relating maximum peak particle velocity (Vmax) and two independent ratios at a time to arrive at the recommended blast design variables for controlling structural vibrations in different site conditions.

Item Type:	Article
Subjects:	Blasting
Divisions:	UNSPECIFIED
Depositing User:	Mr. B. R. Panduranga
Date Deposited:	10 Feb 2026 04:56
Last Modified:	10 Feb 2026 04:56
URI:	https://cimfr.csircentral.net/id/eprint/2937

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