Numerické modelování vodních tlakových zkoušek na vrtech
Title Alternative:Numeric modelling of water-press examinations on boreholes
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Date
2007
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Publisher
Technická Univerzita v Liberci
Abstract
V diplomové práci byla vybrána data vodních tlakových zkoušek (dále jen VTZ) vhodná pro simulaci. VTZ byly získány z terénních měření na lokalitě Potůčky-Podlesí, která se nachází na severním svahu vrchu Pískovcová skála v Krušných horách. Je tvořena granitovým pněm Podlesí. Jde o prostředí s velmi nízkou propustností, proto jsou v tomto případě čerpací zkoušky zcela vyloučeny a upřednostněny VTZ. S vybranými VTZ byly simulovány průběhy pomocí programů a to různými přístupy (ryze puklinový, ekvivalentní porézní médium a kombinovaný) v různých variantách velikosti sítě, hustoty puklin, zadání okrajových podmínek apod. Jednotlivé modely VTZ byly kalibrovány pomocí parametrů propustnosti, koeficientu stlačitelnosti a příp. přestupového koeficientu. Výpočty proudového pole byly provedeny pomocí programu FLOW123D, ve kterém je implementován model založený na kombinovaných sítích. Výsledky byly vygenerovány v podobě textových souborů, které se dále musely zpracovat do grafické podoby. Jako vizualizační prostředek pro puklinové modely byl použit program GMSH. Tento program je obecný pre- a post- procesor pro matematické modely, které jsou založeny na metodách diskretizujících prostorové oblasti do podoby sítí. Z výsledků těchto modelů byla navržena metodika simulace VTZ (tj. vhodný přístup, způsob a typ zadání okrajových podmínek, velikost sítě a počáteční volbu kalibračních parametrů). Výsledné hodnoty modelů a navržená metodika bude dále využita pro řešení konkrétních úloh souvisejících s terénními pracemi.
Data of the water-press examinations, suitable for simulation, were chosen in the diploma work. The water-press examinations were reached from cross-country measurements in the location Potůčky-Podlesí, which is situated on the north downhill of the peak Pískovcová skála in the Krušné hory. It is a milieu with a very low transmission, so in this case the pumping tests are absolutely out of question and the water-press examinations are preferred. With chosen water-press examinations processes were simulated with the software of KMO via different accesses (pure splitting, equivalent porous medium and combined) in different sizes of the net, density of the splitting, setting of boundary conditions, etc. The individual water-press examinations models were calibrated via transmission parameters, compressibility coefficients and eventually the conversion coefficient. The calculation of the stream field were made with the program FLOW123D, where a model is implemented, which is build on combined nets. The results were generated in form of text files, which had to by further elaborated into a graphic form. As the visualization instrument for splitting models the program GMSH was used. This program is a universal pre- and postprocessor for mathematic models, which are based on methods of discreet room area into a net form. As result of these models a procedure of the water-press examinations simulation (i.e. a suitable access, way and kind of setting boundary conditions, net size and initial choice of calibration parameters) was designed. This procedure was tested on the simulation and furthers the water-press examinations.
Data of the water-press examinations, suitable for simulation, were chosen in the diploma work. The water-press examinations were reached from cross-country measurements in the location Potůčky-Podlesí, which is situated on the north downhill of the peak Pískovcová skála in the Krušné hory. It is a milieu with a very low transmission, so in this case the pumping tests are absolutely out of question and the water-press examinations are preferred. With chosen water-press examinations processes were simulated with the software of KMO via different accesses (pure splitting, equivalent porous medium and combined) in different sizes of the net, density of the splitting, setting of boundary conditions, etc. The individual water-press examinations models were calibrated via transmission parameters, compressibility coefficients and eventually the conversion coefficient. The calculation of the stream field were made with the program FLOW123D, where a model is implemented, which is build on combined nets. The results were generated in form of text files, which had to by further elaborated into a graphic form. As the visualization instrument for splitting models the program GMSH was used. This program is a universal pre- and postprocessor for mathematic models, which are based on methods of discreet room area into a net form. As result of these models a procedure of the water-press examinations simulation (i.e. a suitable access, way and kind of setting boundary conditions, net size and initial choice of calibration parameters) was designed. This procedure was tested on the simulation and furthers the water-press examinations.
Description
katedra: KMO; přílohy: 1 CD ROM; rozsah: 51 s.
Subject(s)
vodní tlaková zkouška, simulace, flow123d, gmsh, water-press examination, simulation, flow123d, gmsh