7335

6842

كارشناسي ارشد

مكانيك سنگ

اصفهان: دانشگاه صنعتي اصفهان، دانشكده معدن

1391

يازده، 135ص.: مصور، جدول، نمودار

ص.ع. به فارسي و انگليسي

لهراسب فرامرزي، راحب باقرپور

مرتضي طبايي، ابراهيم فتحي، روح الله طالبي

11/9/91

حميد هاشم الحسيني، محمدعلي روشن ضمير

1396/09/21

كتابنامه

معدن

مهندسي معدن

ID6842

به فارسي و انگليسي: قابل رويت در نسخه ديجيتالي

Study and assessment squeezing effect in the Golab water conveyance tunnel with considering the rock time function behavior and TBM machine advance rate Asghar Rahmati a rahmati@mi iut ac ir Date of submission September 2012 Department of Mining Engineering Isfahan University of technology Isfahan 84156 83111 Iran Degree M Sc language FarsiSupervisors Dr Lohrasb Faramarzi Assistant Prof l faramarzi@cc iut ac ir Dr Raheb Bagherpour Assistant Prof bagherpour@cc iut ac ir AbstractOne of the important factors in weak rock masses that cause problems in tunneling is squeezingphenomenon Stress induced stability problems in weak and particulate rocks are characterized bySqueezing Squeezing is behavior that related with weak rock mass deformation and strength properties This phenomenon is associated with large deformations and time dependent convergence during tunnelexcavation It takes place when a particular combination of induced stresses and material propertiespushes some zones around the tunnel beyond the limiting shear stress at which creep starts Deformationmay terminate during construction or continue over a long period of time Golab water conveyance tunnelis located in Isfahan province in the south eastern edge of the Zayanderoud s valley and Zayanderoudregulation dam This tunnel in the aim of transfer water into Kashan the amount of 2 cubic meters persecond into is excavated This project is approximately 10 5 kilometers including the main tunnel accesstunnel and underground pumping station The excavation method in this tunnel with using a mechanizedtunnel boring machine with telescopic shield and its support system is precast concrete lining segment Which is hexagonal with a negative slope excavation of the inlet to the outlet Rock mass of the tunnel ismostly schist mica schist Slate shale sandstone limestone and conglomerate So there is squeezingpotential possibility in these rocks Due to in this project the effect of experimental methods analyticaland semi analytical is evaluated Then critical section of the squeezing potential presented and finallyNumerical modeling of this phenomenon is done In this paper based on the results of experimental andanalytical methods phyllite rock masses were identified as the squeezing section Then the phyllite section s creep parameters at the Burger model were obtained in the laboratory Then phyllite sectionmodeling using the software FLAC3D and FLAC2D with burgers model for 100 days long term wereperformed Our numerical modeling results show the large displacements due to very low quality of therock mass in this section of the tunnel The results of numerical modeling in the short term that TBMshield would be stuck in this section of tunnel Also modeling this section in the long term showed thatinstability and failure of the segmental support system According to the local reports segmental lining inthis section of tunnel has failure which is consistent with the results of analytical and numerical methods At the end of this study recommendations for support system in phyllite section are represented Key words Squeezing convergence creep FLAC2D FLAC3D water conveyance tunnel telescopicshield segment Burger TBM

لهراسب فرامرزي، راحب باقرپور

مرتضي طبايي، ابراهيم فتحي، روح الله طالبي

حميد هاشم الحسيني، محمدعلي روشن ضمير