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Question on the bolt length for tunnelling support

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

RE: Question on the bolt length for tunnelling support

I believe it's the 2nd one but I suggest that you confirm that. Googling might find a reliable source.

Ryan Coggins, P.E., S.I.
http://www.linkedin.com/in/ryancoggins

RE: Question on the bolt length for tunnelling support

(OP)
thanks msucog's reply!!

Why I have this question is because I found that when searching in the internet, I can find both:
e.g.
http://dk.nanoq.gl/Service/Hoeringsportal/Milj%C3%B8vurderinger/2010/~/media/7DAFB26DAF514599AA993E244729B9CF.ashx

and

http://mining.itb.ac.id/file/bahan_kuliah/TA4111_Klasifikasi%20massa%20batuan.pdf

are using the first one.

This really made me confuse as both information could be find in the internet that generally being adopted.

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