ConcreteGgranite skin friction 1

[eit09]

I have a footing that is siting on granite. Do to the large uplift loads I plan on having them drill into the granite and place a few dowles then fill the holes up with concrete or grout. I am trying to figuire out what type of strength (skin friction) between the rock and concrete interface. Does any one have a reference or simialr situation that could point me in the right direction?

 

[hokie66]

Here is one reference for resin anchored rock bolts.

http://www.dsiamerica.com/products/geotechnic/dywidag-rock-bolts/anchor-design.html

 

[hokie66]

Page 27 of this publication give some design data for cement grouted rock anchors.

http://www.onesteel.com/images/db_images/productspecs/500PLUS_REIDBAR_Design_Manual.pdf

 

[amanpreet]

if uplift loads are large, you are not planning to use the rock anchors to counter the loads. just curious

 

[eit09]

amanpreet,

Yes, that is exactly what I would like to do.