7169

6675

كارشناسي ارشد

مكانيك سنگ

اصفهان: دانشگاه صنعتي اصفهان، دانشكده معدن

1390

يازده، 66ص.: مصور، جدول، نمودار

ص.ع. به فارسي و انگليسي

عليرضا باغبانان، راحب باقرپور

حميد هاشم الحسيني

7/8/91

داورداخلي: سعيد مهدوري; داور خارجي: آزاده احمدي

1396/09/20

كتابنامه

معدن

مهندسي معدن

ID6675

به فارسي و انگليسي: قابل رويت در نسخه ديجيتالي

Numerical Modeling of Fluid Inflow into the Long Zagros Tunnel Mohsen Kordnaziri mohsenkordnaziri@gmail com Date of Submission 2012 03 03 Department of Mining Engineering Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language FarsiSupervisor Alireza Baghbanan bagh110@cc iut ac irSupervisor Raheb Bagherpour bagherpour@cc iut ac irAbstract Groundwater control is a significant issue during most underground constructions in a jointedrock mass More than any other single factor lack of groundwater control can be the major causeof extra cost and construction delays in underground construction A proper estimate of the rate ofinflow is critical in selecting tunnel alignment determining the potential need for groundtreatment i e grouting and or lining installation and obtaining an adequate schedule and costestimate In this thesis a method has been adopted that is able to consider the exact fracturesystem of the field and thereby determine the water ingress amount into a tunnel Hence a codehas been developed that takes advantage of FLUIUT3D and FRACIUT3D codes as base which aredesigned to generate fracture networks and to solve flow equations in fracture systems respectively These base codes are capable of modeling fractures as circular discs and use pipenetwork flow model to solve the flow equations The newly added code has the ability to considerthe tunnel as a three dimentional cylinder which is a development comparing to past linear modelsin this media As a case study Long Zagros Tunnel was selected and its geological data is used tobuild the model Window sampling was used to provide an area based sample of discontinuitiesexposed at a given rock face Four fracture sets including beding was detected after the analysis ofdip and dip direction values using stereographic projection In order to find the distribution bestfitted to measured discontinuity lengths three frequently used probability distributions wereevaluated from which lognormal distribution turned out to be the best Three dimentional fracturedensity required as input parameter of the model was obtained using a simple back analysisrelating the desired parameter to the number of fractures intersecting the sampling window Watson Williams statistical test was conducted on multiple descrete fracture nerworks to choosethose that their geometrical parameters are in accordance with the data collected from the field Acode is developed so that it is able to conduct Lugeon test in order to calibrate hydraulic behaviorof the model using the data obtained from field tests Fracture aperture was the hydraulicparameter to be calibrated through this process Permeability tensor of the field was determinedand used to evaluate the uncertainty of the results of the model Regarding the calculatedpermeability tensor no preferential flow direction was observed and thus it revealed to be of nouse in selecting the appropriate tunnel alignment The comparison between acquired permeabilityand the Lugeon value used showed that empirical relations testify the results of the model betterthan analytical ones Water inflow into the tunnel was calculated using the developed code inwhich an increase in amount was observed in comparison with the results of analytical methods Keywords Long Zagros Tunnel Pipe network DFN Lugeon Water inflow into tunnel

عليرضا باغبانان، راحب باقرپور

حميد هاشم الحسيني

داورداخلي: سعيد مهدوري; داور خارجي: آزاده احمدي