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
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
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Question
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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