In freshly exposed roof area of developing working, which of the following support should be preferably used?
A. square set chock
B. timber prop of 15 cm dia
C. triangular chock
D. full column grouted roof bolt
Answer: Option D
This Question Belongs to Mining Engineering >> Rock Mechanics And Roof Supporting
Related Questions on Rock Mechanics and Roof Supporting
Which of the following is not considered in Bieniawski's geo-mechanics classification?
A. rock strength
B. RQD
C. ground water condition
D. layers thickness
What is the expected range of LBC of a 2.5 m long, 15 cm diameter timber prop?
A. 5 - 10 KN
B. 15 - 20 KN
C. 50 - 60 KN
D. 120 - 130 KN
A. point load test
B. servocontrolled test
C. displacement test
D. post peak test
A. 1.25
B. 1.50
C. 2.25
D. 1.00
Join The Discussion