GeoCorner
When
Where
Event language(s)
-->
Programme 22.5.2026
The length of each presentation is 15 minutes, with an additional 5 minutes reserved for discussion.
- 14.00-14.20 Tamanna-E-Hafiz Maisha - Vibration transmission characteristics across the rock–concrete interface under blast loading
Prof. Wojciech Solowski, Director of the Master's Programme in Geoengineering
Thesis presented
Author: Tamanna-E-Hafiz Maisha
Supervisor: Professor Mikael Rinne
Advisor: Tuomo Hänninen
Abstract:
Blast-induced vibration poses risks to nearby structures, yet wave behavior specifically at the rock–concrete interface remains poorly understood. This thesis characterizes how blasting-induced vibration propagates across this interface using field measurements from three controlled test blasts at a crushing mine in Vihti, Finland. Vibrations were recorded at two vertically aligned monitoring points — MP10 in rock and MP1 in a concrete strip footing — and analyzed through acoustic impedance theory, PPV transmission ratios, FFT spectral analysis, regression-based sensitivity analysis, and K-factor variation.
While impedance theory predicts approximately 97% wave transmission across the interface, field measurements reveal substantial attenuation, with all PPV transmission ratios falling below 1.0. The interface exhibits strong directional anisotropy: vertical components transmit at over 50% efficiency while horizontal components are attenuated to 10–30%. Regression analysis confirms vibration direction as the dominant control variable, accounting for over 73% of model sensitivity. FFT analysis identifies the interface as a frequency-selective spectral filter, and K-factor comparisons confirm its role as a natural vibration damper.