Določitev koeficienta prepustnosti s pomočjo nalivalnih poizkusov na območju Masarykove ceste v Ljubljani : diplomsko delo

Štern, Marko (author), Brenčič, Mihael (mentor)

V diplomski nalogi smo opisali potek izvedbe in obdelave nalivalnih poizkusov, ki so bili izvedeni v sklopu razširitve Železniške postaje Ljubljana in gradnje trgovsko bivalnega kompleksa Emonika. Vrtini ZP-5-HG in V-EM-1-PT, v katerih so bili izvedeni poizkusi, se nahajata na območju stika Masarykove ceste in trga Osvobodilne fronte v Ljubljani. Vrtina ZP-5-HG je bila izvrtana do globine 15,8 m in vrtina, V EM 1 PT do globine 16 m. Pri vrtanju nismo prišli do kamninske podlage perm karbonskih plasti. Globina podzemne vode se na območju železniške postaje in bodočega kompleksa Emonike nahaja od 21,60 do 22,50 m pod površjem. Vrtini se v celoti nahajata v kvartarnih sedimentih dobro izdatnega vodonosnika Ljubljanskega polja, ki je izredno pomemben za oskrbo mesta Ljubljana s pitno vodo. Generalna smer toka podzemne vode je od severozahoda proti jugovzhodu, pomemben pritok pa poteka skozi Ljubljanska vrata (ožino med Rožnikom in Gradom) iz juga proti severu. Ocenjen pretok skozi ožino znaša približno 500 l/s. Nestacionarni nalivalni poizkusi so bili izvedeni in obdelani po metodi Hvorsleva, ki temelji na obdelavi krivulje znižanja vode nalite v vrtino. V vrtini ZP-5-HG je bil določen povprečni koeficient prepustnosti 1,16×10-3 m/s, razpon izmerjenih koeficientov pa se giblje na intervalu od 6,15×10 4 do 2,14×10-3 m/s. V vrtini V-EM-1-PT je bil določen povprečni koeficient prepustnosti 1,10×10-3 m/s, razpon izmerjenih koeficientov pa se giblje na intervalu od 1,98×10-4 do 2,10×10-3 m/s. Na podlagi hidrogeološke klasifikacije lahko območje Masarykove ceste v Ljubljani opredelimo kot dobro prepustno.

• Language: Slovenian
• Keywords: koeficient prepustnosti, metoda po Hvorslevu, nalivalni poizkusi, ponikanje, nezasičeno območje, ponikanje
• Work type: Bachelor thesis/paper
• Typology: 2.11 - Undergraduate Thesis
• Organization: NTF - Faculty of Natural Sciences and Engineering
• Place of publishing: Ljubljana
• Publisher: M. Štern
• Year: 2023
• Number of pages: XI, 45 str.
• PID: 20.500.12556/RUL-151195
• UDC: 55
• COBISS.SI-ID: 168607747
• Publication date in RUL: 30.09.2023

Secondary language

• Language: English
• Title: Determination of the permeability coefficient by permeability tests in the area of Masarykova cesta in Ljubljana : diploma work

Abstract

In the diploma thesis, we described the course of implementation and processing of permeability tests that were carried out as part of the expansion of the Ljubljana Railway Station and the construction of the Emonika commercial-residential complex. Drill-holes ZP-5-HG and V-EM-1-PT, where the tests were conducted, are located in the area where Masarykova ulica and trg Osvobodilne Fronte in Ljubljana intersect. Drill-hole ZP-5-HG was drilled to a depth of 15.8 meters, while V-EM-1-PT reached a depth of 16 meters. During drilling, we did not reach the bedrock of the Permian Carboniferous layers. The groundwater depth in the area of the railway station and the future Emonika complex ranges from 21.60 to 22.50 m below the surface. Both drill-holes are located entirely in Quaternary sediments of the highly permeable aquifer of the Ljubljana Basin, which is of great importance fort he drinking water supply of the Ljubljana city. The general groundwater flow is from northwest to southeast, with a significant inflow occurring through the Ljubljana Gate (the passage between Rožnik and Grad hill) from the south to the north. The estimated flow through the gate is approximately 500 liters per second. Nonstationary permeability tests were conducted and processed using the Hvorslev method, which is based on analyzing the water level drawdown curve in the drill-hole. In drilll-hole ZP-5-HG, the average hydraulic conductivity was determined to be 1.16×10-3 m/s, with a range of coefficients ranging from 6.15×10 4 to 2.14×10-3 m/s. In drill-hole V-EM-1-PT, the average permeability coefficient was determined to be 1.10×10-3 m/s, with a range of coefficients ranging from 1.98×10-4 to 2.10×10-3 m/s. Based on the hydrogeological classification, the area of Masarykova ulica in Ljubljana can be defined as highly permeable.

• Keywords: permeability coefficient, Hvorslev method, permeability tests, unsaturated zone, infiltration