THE SIGNIFICANCE OF STRUCTURAL AND GEOLOGICAL RELATIONSHIP ASSESSMENT IN THE CONSTRUCTION OF THE OMBLA UNDERGROUND HYDROELECTRIC POWER PLANT
Journal Title: UNKNOWN - Year 1997, Vol 9, Issue 1
Abstract
The construction design of the underground hydroelectric plant Ombla required geological and structural investigations to he carried out. Due to past earthquakes in the area permanent tectonic movements were inferred. Therefore, in the wider and adjacent surroundings of the Ombla spring it was necessary to analyze the structural fabric and the geodynamic characteristics of the area. The most active zone encountered is the front part of a thrust fault belonging to the Dinaricum regional structural unit. The compressive regime is maintained as a response to the regional stress of an approximately S-N orientation. Different displacements of various parts of the Dinaricum unit are present. Along the rim of the structural blocks, the Hum-Om-bla fault zone extends, accompanied by left transcurrent faults, Through this zone the main groundwater drainage occurs supplying the Ombla spring. In the local Ombla spring area this zone is characterized by three sub-blocks and three major faults. The most important fault for the vital facilities of the Ombla hydroelectric power plant is the Pločice fault which divides the structural sub-blocks. Along this fault zone there are four mutually connected. The lowest two arc active groundwater draining systems supplying the Ombla spring. The data on local stress implies the following deformation of sub-blocks: sub-blocks 2c and 2f are displaced along normal faults from 20° to 30° to the left, downwards, while the sub-block 2 d is displaced along the Pločice thrust fault of 100° to 130° to the left, upwards. The structural data confirmed that the building of an underground dam with a height from 100 to 130 m was feasible. The connection between the caverns and the fault zone was determined. The unfavorable position of the active Pločice fault zone imposes the construction of vital Ombla power plant facilities underground.
Authors and Affiliations
Renato Buljan Eduard Prelogović
Keywords
Related Articles
- EP ID EP29867
- DOI -
- Views 166
- Downloads 3
PROBNA PODZEMNA EKSPLOATACIJA ARHITEKTONSKO-GRAĐEVNOG KAMENA U KAMENOLOMU "KANFANAR", ISTRA
Preliminarno izvješće o rezultatima praćenja probne podzemne eksploatacije arhitektonsko-građevnog kamena u slojevitom ležištu. Podzemna je eksploatacija detaljno opisana i sugerirane su metode za njeno izvođenje.
SITNJENJE - PRVI STUPANJ U OPLEMENJIVANJU MINERALNIH SIROVINA
Sitnjenje je proces u kojem pod djelovanjem mehaničkih sila mije¬njamo disperzno stanju čvrstih tvari. Disperzno stanje jednoznačno je određeno granulometrijskim sastavom. Do sitnjenja dalazi uslijed de¬formacije zrna, p...
SOIL, BARK AND LEAF TRACE METAL LOADS RELATED TO THE WAR LEGACY (THE PRAŠNIK RAINFOREST, CROATIA)
As a special forest vegetation reserve, the Prašnik rain forest is a highly protected area which owes its protection not only to a unique composition of trees, but also to its geographical position and, to an extent, his...
ASTEROIDS
Asteroids are the largest minor bodies in the Solar System. Nowadays they are in the research focus due to several facts about them: first, a subclass of asteroids can collide with Earth, and consequences of such a colli...
TRAVERTINE THE RESTORATION STONE FOR THE ZAGREB CATHEDRAL
Roman travertine San Pietro Classico, from a deposit in the Acque Albule basin near Rome, will be used for the restoration of the cathedral in Zagreb instead of the previosly used lithotamnian limestone. The genesis and...