Naslov (eng)

Advanced methods for assessment of the interaction dynamics of the hydrogeological environment and pressurized tunnel: A case study of HPP Pirot

Autor

Mikavica, Dušan
Todorović, Maja
Ćuk Đurović, Marina
Jemcov, Igor

Publisher

Opis (eng)

This study presents a methodological framework for assessing the hydraulic behavior and hydrogeological sensitivity to pressure regimes induced by the operation of a pressurized tunnel at the Hydroelectric Power Plant Pirot. By integrating total-loss tests, structural assessments, and high-frequency monitoring of pore pressure, temperature, and electrical conductivity, along with hydrochemical analyses, a comprehensive understanding of flow mechanisms between the tunnel and surrounding rock mass, hydraulic connectivity, and water origins across different lithological zones has been provided. Total-loss tests quantified cumulative leakage, while sensors in the surge tank tracked key parameters, facilitating analysis of solute and thermal transport. Internal piezometers monitored transient pore pressures, revealing the hydraulic connections between the tunnel and its surrounding environment. Results show varying reactivity among hydrogeological units; highly fractured systems exhibited rapid pressure fluctuations in sync with tunnel operations, indicating direct connectivity, whereas others showed minimal response due to low permeability or isolation. Notably, significant lining cracks did not consistently correlate with leakage, suggesting that lining conditions alone are insufficient for evaluating hydraulic performance. Hydrochemical analyses confirmed interactions between the tunnel and groundwater, particularly in sensitive areas. Findings indicate that the hydraulic reactivity of the rock mass is primarily influenced by the geometry of pore spaces and proximity to the surge tank, with tunnel lining condition having a minor role in overall sensitivity. This methodological approach enhances understanding of the interplay between the performance of the concrete lininggrout-rock interface and the surrounding hydrogeological environment under different pressure loads, underscoring the importance of high-resolution hydrogeological monitoring in assessing the hydraulic response of the rock mass, detecting potential leakage, and identifying hydraulically critical zones along the tunnel and defining priorities for rehabilitation works.

Jezik

engleski

Datum

2025

Licenca

© All rights reserved

Predmet

hydraulic tunnel, concrete lining, cracks, hydrogeological monitoring, hydrochemical indicators, tunnel-groundwater interaction

Deo kolekcije (1)

o:243

Institut za vodoprivredu "Jaroslav Černi"