Question on the bolt length for tunnelling support
Question on the bolt length for tunnelling support
(OP)
To calculate the bolt length for tunnelling support, I understand that the equation form Barton can be used. However, I found there two versions of the equation, which confuse me. I wonder any of you could know which is the correct one.
1) bolt length = (2+0.15B)/ESR
2) bolt length = 2 + (0.15B/ESR)
thanks
1) bolt length = (2+0.15B)/ESR
2) bolt length = 2 + (0.15B/ESR)
thanks





RE: Question on the bolt length for tunnelling support
Ryan Coggins, P.E., S.I.
http://www.linkedin.com/in/ryancoggins
RE: Question on the bolt length for tunnelling support
http:
Ryan Coggins, P.E., S.I.
http://www.linkedin.com/in/ryancoggins
RE: Question on the bolt length for tunnelling support
Why I have this question is because I found that when searching in the internet, I can find both:
e.g.
http
and
h
are using the first one.
This really made me confuse as both information could be find in the internet that generally being adopted.
RE: Question on the bolt length for tunnelling support
To ask a question:
http://www.fhwa.dot.gov/bridge/tunnel/qa.htm
FHWA Tunnel website:
http://www.fhwa.dot.gov/bridge/tunnel/index.htm