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For a rock mass: RQD=80, J₁ = 4, J₁ = 1, and: Ja 1 Jw 0.33 a) Calculate the rock mass number ( b) We want to construct a circular tunnel with diameter of 10 m in the depth of 200 m below the ground surface in this rock mass. If the rock mass is not squeezing, determine the roof support pressure? c) If we want to use steel fiber reinforced shotcrete (SFRS)with shear strength of 5.5 MPa for the support of this tunnel, what would be the required thickness of the SFRS? (*

For a rock mass: RQD=80, J₁ = 4, J₁ = 1, and: Ja 1 Jw 0.33 a) Calculate the rock mass number ( b) We want to construct a circular tunnel with diameter of 10 m in the depth of 200 m below the ground surface in this rock mass. If the rock mass is not squeezing, determine the roof support pressure? c) If we want to use steel fiber reinforced shotcrete (SFRS)with shear strength of 5.5 MPa for the support of this tunnel, what would be the required thickness of the SFRS? (*

Structural Analysis
Structural Analysis
6th Edition
ISBN:9781337630931
Author:KASSIMALI, Aslam.
Publisher:KASSIMALI, Aslam.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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For a rock mass: RQD = 80, J₁ = 4, J₁ = 1, and: Ja 1 Jw 0.33 a) Calculate the rock mass number ( b) We want to construct a circular tunnel with diameter of 10 m in the depth of 200 m below the ground surface in this rock mass. If the rock mass is not squeezing, determine the roof support pressure? F c) If we want to use steel fiber reinforced shotcrete (SFRS)with shear strength of 5.5 MPa for the support of this tunnel, what would be the required thickness of the SFRS? (*
Transcribed Image Text:For a rock mass: RQD = 80, J₁ = 4, J₁ = 1, and: Ja 1 Jw 0.33 a) Calculate the rock mass number ( b) We want to construct a circular tunnel with diameter of 10 m in the depth of 200 m below the ground surface in this rock mass. If the rock mass is not squeezing, determine the roof support pressure? F c) If we want to use steel fiber reinforced shotcrete (SFRS)with shear strength of 5.5 MPa for the support of this tunnel, what would be the required thickness of the SFRS? (*
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