Vol.1, No 5, 1998 pp. 593-596
UDC 627.8.034.9(045)

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SAFETY PROVISIONS AGAINST PIPING FOR SELOVA DAM
Veljko Marković¹, Ćirić Miodrag², Jelena Marković^1
1 University of Niš, Faculty of Civil Engineering
² V.P. Selova, Kuršumlija

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Abstract. Selova dam is clay core rockfill dam a total height of  71.00 m. In the longitudinal profile the valley is nonsymmetrical, with the left bank very slow and right bank relatively steep. The reduction in vertical stress has been computed for Selova dam to control the potential for hydraulic fracturing. The analyses, both on 2D and 3D finite element models have shown that the safety coefficient against core cracks is to be increased and consequently additional provisions were included into design: a interception filter zone and large semipervious tranzition zone between the core and the downstream shell as a second measure defensive line. The F.E. analysis has also pointed out a small amount of load transfer from shoulder to the core due to the settlement and little pore pressure build due to the free draining shoulders.

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MERE SIGURNOSTI PROTIV FILTRACIONE EROZIJE KOD BRANE SELOVA Brana Selova je kamena brana sa glinenim jezgrom ukupne visine 71.00 m. U poprečnom preseku dolina je nesimetrična, pri čemu je leva obala sa blagim nagibom, dok je desna relativno strma. Redukcija vertikalnih napona je sračunata kod brane Selova u cilju razjašnjenja mogućnosti pojave hidrauličkog sloma. Analize, kako 2D tako i 3D modeli sa konačnim elementima, su pokazale da  koeficijent sigurnosti protiv sloma treba povećati i saglasno tome uključeno je  dopunsko osiguranje u projekat: zaštitna filterska zona  i velika polupropusna zona između jezgra i nizvodne kosine kao druga odbrambena mera. Anlize sa konačnim elementima takođe pokazuju da postoji mali prenos sila sa bokova na jezgro tokom sleganja i  malo povećanje pornog  pritiska u jezgru.