بررسي تاثير امواج لرزه اي بر روي خواص هيدروديناميكي توده سنگ درزه دار

چكيده انگليسي :

100 Effect of seismic waves on Hydro Mechanical properties of fractured rock masses Meysam Lak Meysam lak@mi iut ac ir Date of Submission 2014 01 18 Department of Mining Engineering Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language Farsi Supervisor Alireza Baghbanan bagh110@cc iut ac ir Supervisor Hamid Hashemolhoseini hamidh@cc iut ac ir Abstract Nature and distribution of structural components of rock mass affects rock mass behavioragainst the static and dynamic loadings Due to a direct effect of dynamics on stability of man made structures dynamic analysis and evaluation of propagation effects on mining and civilprojects is important specially Some applications of wave propagation are movement of urbantrains and their effect on adjacent structures the explosion in military industry and evaluate theintensity and attenuation of blast waves effect of earthquake on production of oil and gasreservoirs evaluation of seismic waves in rock masses and its effects on various properties of therock mass Transmission of seismic waves from a particular region may influence the hydraulicproperties of the rock mass in that region Permeability is one of the most important hydraulicproperties of rock mass The importance of this parameter can be found in these categories oil andgas reservoirs stability of rock slopes dam foundation underground spaces nuclear waste and ingeneral how each type of transmission fluid within the rock mass Modeled in this study is performed discontinuously using UDEC At first the 8 models withdimensions of 20 20 meters and with 8 different types of discrete fracture network DFN aremade and all analyzes were performed on these models All modeling of fluid flow in this thesiscan be placed in three different groups These three groups are Group 1 In this group after theconstruction of the model geometry models without the mechanical cycle is entered to 6fluid flowsimulation step It should be noted that the joints aperture is considered equal to 65 10 m in thisgroup Group 2 In this group after the construction of the models geometry put them underhydrostatic boundary conditions and in the next step models are entered to fluid flow simulation Group 3 In this group after exposure models under dynamic loading and experiencing theearthquake models are entered to fluid flow simulation In dynamic modeling step models weresubjected to dynamic stress of Parkfield earthquake with assuming Barton Bandis constitutivemodel for joints At this step all considerations of dynamic analysis such as input loading boundary and initial conditions attenuation and wave transmission through the rock mass has beencarefully examined Moreover at this step the natural frequency was also calculated In fluid flowmodeling step models were subjected to hydraulic boundary conditions and fluid flow is passedthrough them It should be noted that at this step the fluid is assumed Newtonian andincompressible The results indicate that the transmission of seismic waves can cause two problems The firstproblem is that the transmission of seismic waves increases the joint aperture and the secondproblem can be seen that earthquake waves cause successive displacement of blocks and a slightchange in its position relative to the previous mode Both problems increase permeability in theregion that has been studied It should be noted that seismic waves have affected the hydraulicanisotropy and have increased the anisotropy of the hydraulic properties of the studied area Theseproblems indicate that seismic waves in the deep Earth can also be effective in spite of theexpected and according to the results of this study seismic waves have increased the permeabilityof the rock mass Increased permeability entails certain consequences that the most important is theincreased inflow of water into tunnels and underground spaces This problem directly affects thestability of underground spaces Keywords Rock mass Wave transmission Earthquake Dynamic

لك، ميثم

بررسي تاثير امواج لرزه اي بر روي خواص هيدروديناميكي توده سنگ درزه دار

عبور موج , زلزله , تحليل ديناميكي , شبكه ي درزه ي مجزا , نفوذپذيري