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4. The below diagram shows the cross-section of an underground machine hall. The hall is to be excavated in a sequence of metamorphosed argillaceous rocks of unit weight 22 kN/m3, which contains five fracture sets with the following orientations: Set 1 2 3 045 Dip direction 058° 195° 121° 160° 335° Dip angle 54° 70° 61° 32° 64° 5.0m B 5.0m A 25.0m

4. The below diagram shows the cross-section of an underground machine hall. The hall is to be excavated in a sequence of metamorphosed argillaceous rocks of unit weight 22 kN/m3, which contains five fracture sets with the following orientations: Set 1 2 3 045 Dip direction 058° 195° 121° 160° 335° Dip angle 54° 70° 61° 32° 64° 5.0m B 5.0m A 25.0m

Applications and Investigations in Earth Science (9th Edition)
Applications and Investigations in Earth Science (9th Edition)
9th Edition
ISBN:9780134746241
Author:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Publisher:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Chapter1: The Study Of Minerals
Section: Chapter Questions
Problem 1LR
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4. The below diagram shows the cross-section of an underground machine hall. The hall is to be excavated in a sequence of metamorphosed argillaceous rocks of unit weight 22 kN/m3, which contains five fracture sets with the following orientations: Set 1 2345 Dip direction Dip angle 058° 54° 195° 70° 121° 61° 160° 32° 335° 64° 5.0m B Ban 20.0m 5.0m A 25.0m Each set has a friction angle of approximately 30° and zero cohesion. It is proposed that the axis of the machine hall will be oriented on a heading 030° and will be horizontal. Determine the kinematic feasibility of all the tetrahedral blocks formed by the intersection (trisect) of the fracture sets and the roof (or identify the trisect block on stereo-net).
Transcribed Image Text:4. The below diagram shows the cross-section of an underground machine hall. The hall is to be excavated in a sequence of metamorphosed argillaceous rocks of unit weight 22 kN/m3, which contains five fracture sets with the following orientations: Set 1 2345 Dip direction Dip angle 058° 54° 195° 70° 121° 61° 160° 32° 335° 64° 5.0m B Ban 20.0m 5.0m A 25.0m Each set has a friction angle of approximately 30° and zero cohesion. It is proposed that the axis of the machine hall will be oriented on a heading 030° and will be horizontal. Determine the kinematic feasibility of all the tetrahedral blocks formed by the intersection (trisect) of the fracture sets and the roof (or identify the trisect block on stereo-net).
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