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ANALYSIS OF ANOMALIES IN THE DEVELOPMENT OF FILTRATION REGIME AT DOB?INA DAM

Juraj Škvarka, Emília Bednárová, Ladislav Fabian

First published: 2020-09-20https://doi.org/10.5593/sgem2020/1.1/s02.048View metrics

Abstract

The Dobsina dam is a part of the water management system ?Dobsina? which consists of the Palcmanska Masa reservoir, the Vlca Dolina hydroelectric power plant, and the Dobsina afterbay reservoir. Palcmanska Masa and Vlcia dolina dams were built in the years 1956 -1958, Dobsina dam in 1960. It is an earthfill dam, and the body of the dam is divided into the left and right part by a functional outlet block, which is situated in the valley alluvial plain. On the left side of the dam, the sealing was built of stabilized local soil with a variable thickness from 0.5 m at the crest, to 0.75 m on the downstream toe of the dam. The sealing continues by an elongated sealing blanket, embedded to the subsoil by a sheet pile wall. On the right side of the dam, the sealing element is a 0.9 mm thick PVC foil, protected on both sides by specially shaped precast concrete panels and layers of non-sandblasted felt. The sealing is also embedded in the subsoil by a sheet pile wall. After 40 years of operation, the technical condition of the PVC foil was revised. The results showed that the tightness of the sealing did not show changes, but its elasticity decreased. These changes in the form of microcracks were manifested mainly in the area of water level fluctuations in the reservoir. After local repairs of the PVC foil, the reservoir was put into operation. The reliability of the sealing function is monitored by means of observation boreholes, which are situated close to the compound appurtenant object. In recent years, anomalies in water level regime have been observed in two observation boreholes. The paper focuses on the analysis of the causes of existing anomalies.

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Publication details

Title
ANALYSIS OF ANOMALIES IN THE DEVELOPMENT OF FILTRATION REGIME AT DOB?INA DAM
Authors
Juraj Škvarka, Emília Bednárová, Ladislav Fabian
Proceedings
SGEM International Multidisciplinary Scientific GeoConference EXPO Proceedings; 20th SGEM International Multidisciplinary Scientific GeoConference Proceedings 2020, Science and Technologies in Geology, Exploration And Mining
Publisher
STEF92 Technology
Year
2020
Pages
389-396
SWS Citekey
Skvarka20202389396
ISSN
1314-2704
ISBN
978-619-7603-04-0
Language
en
Publication type
Conference Paper
Keywords
water level regimedamsubsoilanomaliesfiltration stability
References3

  1. BEDN?ROV?, E. et al.: Priehradn? stavite?stvo na Slovensku. Originality, m??niky, zauj?mavosti. Bratislava, KUSKUS, 2010, 207 s.

  2. SPI??K, Z., VARGA, M.: VN Dob?in? – Geological and hydrogeological survey. Doplnkov? in?iniersko-geologick? prieskum. Z?vere?n? spr?va. Montana s. r. o. Ko?ice, 2013.

  3. In situ measurement data files

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