5232

4902

كارشناسي ارشد

مكانيك سنگ

اصفهان: دانشگاه صنعتي اصفهان،دانشكده معدن

1388

نه،[110]ص.:مصور،جدول،نمودار

ص.ع.به فارسي

عليرضا باغبان،حميد هاشم الحسيني

لهراسب فرامرزي

11/3/89

مصطفي شريف زاده،نادر فتحيان پور

1396/09/29

كتابنامه

مهندسي معدن

ID4902

به فارسي و انگليسي: قابل رويت در نسخه ديجيتالي

8 March 2010 Department of Mining Engineering Isfahan University ot Technology Isfahan84156 83111 IranDegree M Sc Language FarsiSupervisor Alireza Baghbanan E mail bagh110@cc iut ac ir Hamid Hashemolhosseini E mail hamidh@cc iut ac irAbstractPermeability is a physical property of rock masses and it is very important in difference field ofengineering works particularly in the Earth science It is usually calculated with analytical andnumerical methods Analytical methods apply for simple and regular joint set systems and forcomplicated Discrete Fracture Network DFN models only numerical methods are applicable Numerical simulations demand a large computation resources and great space for data storage andin general it is very time consuming particularly when we have a large model size with denselypopulated of fractures Using Effective Medium Theory EMT approach for calculation theconductivity and permeability of a lattice network is also reported in the literature as alternativemethod for numerical solution However the degree of uncertainties for fluid flow analysis usingEMT method compared with numerical modeling has not yet been calculated and reported and isthe main objective of this research work Firstly we developed a code based on the modified EMT methodology for calculating the overallpermeability of fracture networks using Matlab program and Representative Elementary Volume REV sizes are also approximated A sensitivity analysis about the effect of geometricalparameters of fracture distribution such as density orientation fractures and also three differentaperture patterns are considered constant aperture distributed fracture apertures arecorrelated uncorrelated with trace length were set for quantifying the degree of uncertaintiesbetween calculated permeability by numerical and EMT methods Using Monte Carlo simulationtechniques stochastic DFN models were generated with a large number of realizations TheUniversal Distinct Element Code UDEC is also facilitated for numerical simulation analysis The results show that the calculated mean values of permeability between DFN realization modelsby EMT method are closely to the results of numerical methods particularly when the fracturedensity is large in this work 6 9 The REV size for DFN models with constant fracture aperture areapproximated in the same value however for distributed fracture aperture models the REV size inEMT method is smaller than numerical methods The results of sensitivity analysis show that theeffect of geometric parameters of fractures on calculated permeability with two methods follow thesame trend With increasing the fracture density network permeability is increased andconcentration coefficient of fisher distribution of fracture orientation does not have a significantimpact on the results Key Words Permeability Effective Medium Theory Numerical methods Distributed fractureapertures Uncertainty Monte Carlo Representative Elementary Volume Sensitivity analysis concentration coefficient of fisher distribution

عليرضا باغبان،حميد هاشم الحسيني

لهراسب فرامرزي

مصطفي شريف زاده،نادر فتحيان پور