Question: Question 3 ( 3 0 ) a . Railway station cavern with span 1 6 m , wall height 6 , Q = 2 (

Question 3(30)
a. Railway station cavern with span 16m, wall height 6,Q=2(poor). Use the Q system to design a support system for the cavern, given the following.
Roof: ESR=0.8
Wall ESR =0.8
i. Estimate the De for the roof
ii. Estimate the category support for the roof
iii. Estimate the bolt spacing for the roof
iv. Estimate the boit length for roof
v. Estimate the Q value of the wall
vi. Estimate the De for the wall
vii. Estimate the category support for the wall
viii. Estimate the bolts spacing for the wall
jx. Estimate the bolts length for the wall
x. Between the roof and wall which one require less support.
Question 3 ( 3 0 ) a . Railway station cavern

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