Page 58 - Engineering Rock Mass Classification_ Tunnelling, Foundations and Landslides
P. 58
Anchorage may be 10 to 15 cm 10 to 15 cm Rock bolt
hard to obtain; as required
considerable mesh (1.2 to 1.8 m
and straps required center to
center)
As above 15 cm or 15 cm or As above
more more
Anchorage may 15 cm or more on Medium sets as
be impossible; whole section required
100% mesh and
straps required 15 cm or more on Medium to
whole section heavy sets as
As above required
Heavy sets as
Anchorage may be 15 cm or more on required
impossible; 100% whole section
mesh and straps
required
