A tunnel is to be driven through a weathered quartz with the following characteristics: → A point-load strength index of 4 MPa. → ARQD of 65%. → Spacing between joints is 450 mm. → Joints are slightly rough and have a separation less than 1 mm. Walls are highly weathered. → Tunneling conditions are anticipated to be damp. → The dominant joint set dips at 30° against the direction of the drive. What is the RMR of this rock mass? A) RMR = 31 B) RMR = 53 C) RMR = 70 D) RMR = 89 2. PROBLEM 4 A dam foundation is to be built upon a strong limestone with the following characteristics: → Uniaxial compressive strength of 80 MPa. →ARQD of 80%. → Spacing between joints is 80 mm. → The joint set has been described as follows: → Average discontinuity length is 4 m. → Separation of joints is generally less than 0.1 mm. →Joints are slightly rough and moderately weathered. → Joints have no infilling. →Groundwater conditions are assumed to be dripping. → The discontinuity orientation was deemed fair. What is the RMR of this rock mass? A) RMR = 31 B) RMR = 53 C) RMR = 70 D) RMR = 89

Structural Analysis
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ISBN:9781337630931
Author:KASSIMALI, Aslam.
Publisher:KASSIMALI, Aslam.
Chapter2: Loads On Structures
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1. A tunnel is to be driven through a weathered quartz with the following characteristics: → A point-load strength index of 4 MPa. → ARQD of 65%. → Spacing between joints is 450 mm. → Joints are slightly rough and have a separation less than 1 mm. Walls are highly weathered. → Tunneling conditions are anticipated to be damp. → The dominant joint set dips at 30° against the direction of the drive. What is the RMR of this rock mass? A) RMR = 31 B) RMR = 53 C) RMR = 70 D) RMR = 89 2. PROBLEM 4 A dam foundation is to be built upon a strong limestone with the following characteristics: → Uniaxial compressive strength of 80 MPa. →ARQD of 80%. → Spacing between joints is 80 mm. → The joint set has been described as follows: → Average discontinuity length is 4 m. → Separation of joints is generally less than 0.1 mm. →Joints are slightly rough and moderately weathered. → Joints have no infilling. →Groundwater conditions are assumed to be dripping. → The discontinuity orientation was deemed fair. What is the RMR of this rock mass? A) RMR = 31 B) RMR = 53 C) RMR = 70 D) RMR = 89
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