Physical model of different leakage conditions

U ovom radu provedeno je laboratorijsko ispitivanje procjeđivanja kroz tijelo modela homogene nasute brane s i bez drena te modela heterogene nasute brane s glinenom jezgrom na fizikalnom uređaju HM 169. Sva tri modela brana izgrađeni su na nepropusnoj podlozi. Uz pomoć preljeva na uređaju simuliraju se situacije s gornjom vodom na razini od 20 i 30 cm. Promatrano je ponašanje sva tri modela brane, formiranje procjedne linije, virne plohe te su mjereni protoci vode kroz tijelo modela brane. Na temelju laboratorijskog ispitivanja proveden je proračun procjeđivanja kroz tijelo brane Cassagrandovim postupkom konstrukcije depresijske linije te metodom strujne mreže. Navedenim postupcima određene su vrijednosti protoka za svaki od tri modela brane. Za modele homogenih brana protoci mjereni na fizikalnom modelu brana su oko 60% veći od protoka dobivenih metodom Cozenyjeve parabole, dok su protoci dobiveni metodom strujne mreže slični protocima na fizikalnom modelu brana. Protok kroz model glinene jezgre jednak je nuli za sve tri metode.The task of the graduation theisis was laboratory percolation testing through the model of homogeneous embankment dam with or without a drain and also percolation testing through the model of heterogenous embankment dam with a clay core that was carried out on physical device HM 169. All three dam models were built on an impermeable foundation. With the help of overflow on the device, situations were simulated with upper water at the level os 20 and 30 cm. The behaviour of all three dam models was observed. Formation of the seepage line, the strainer surface and the water flows through the body od the dam model were measured. Calculation of laboratory test was carried out with Cassagrand’s counstruction process od depression line and power network method. Flow values for each of the three dams were determined by the above procedures. For homogeneous dam models, the flows measured od the physical model of the dams are 60% higher than the flows obtained by the Cozeny's parabolamethod. The flows obtained by the power network method are similar to the flows on the physical modelof dams. The flow through the clay core model is zero for all three methdos