Underground Construction
1. If timed detonations are used, blast charges detonate on a space of _______ milliseconds.
Select one:
a. 17-39
b. 20-30
c. 32-58
d. 10-21
2. Portals are only used with railroad tunnels. (Ture or False)
3. When working in compressed air, in a tunnel, it is considered a hazardous environment. (Ture or False)
4. The value of K in the equation of I=KH for glacial deposits is
a. .5-.6
b. .25-.6
c. .43-.71
d. .05-.33
1)
If timed detonations are used, blast charges detonate on a space of 20-30 milli-seconds, the range varies depending on various factors
2) Portals are the entrance of the tunnel, they are provided mostly for roads and rails, however, they are not only used for roads and rails, they are also used for canals (F)
3) In a tunnel, if there is compressed air it will have severe effects, it may damage hearing, brain and skin and also there is always a chance for fire in a tunnel, so it is considered as a hazardous environment (T)
4)The value of K in I=KH is between the range 0.6-0.7, so the closest option is (a)
Underground Construction 1. If timed detonations are used, blast charges detonate on a space of _______...
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