Evaluation of the geomechanical properties of rock masses freeway tunnel Pyrshryf located in Arak-Khorramabad and suggested support system based on empirical and numerical methods

Document Type : Research Paper

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Abstract

In this study, to determine the parameters of the rock mass quality Geomechanical and estimates and preliminary measures for tunnel maintenance system Pyrshryf, different methods have been used experimentally and numerically. In the case of four classification system RMR (rock mass Geomechanical classification), Q (quality index tunneling), GSI (Geological Strength Index) and RMi (rock mass index) was used. The numerical method of limit equilibrium method (software Unwedge) and finite element method (the software Phase2) were used. In order to estimate the parameters of the rock mass resistance criteria Hoek - Brown was used.
The empirical analysis results showed that the first section of the tunnel to the second level, where conditions are unstable. The analysis also showed that the Unwedge instability, landslides and rock from the walls and roof of the tunnel is wedge manure. Phase2 analysis also revealed that the drilling of a step due to movements over the standards is not possible. The drill holes in two phases of the vault and Patagh was predicted. The following temporary storage system using experimental and numerical methods were proposed. Finally, it should be noted that the use of experimental and numerical methods in tunnel design is of great importance, because, in order numerical methods on the accuracy and reliability of the experimental procedures were carried out, are added. It should be noted that these methods are not mutually exclusive, but being in line with each other can lead to the development of the underground structures are designed and reliable results than when only a method is used, the provide. The use of multiple methods and new experimental results can be validated numerical methods that are usually not visible with their tolerance, will help.

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References

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History

  • Receive Date: 18 January 2016
  • Revise Date: 19 July 2016
  • Accept Date: 01 August 2016

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