Rock Reinforcement Support Flashcards
What are the design methods
numerical methods,
empirical methods,
analytical methods,
obersvation methods
What do rock bolts provide support to
broken ground
what are the consideration in terzaghis rock load
determines the loosening and height of pressure in relation to the height of the tunnel
complete some RMR and empircal equations
to be completed
What are the design principles to the stress distribution within an underground mine
there is a natural pressure arch and within that is the failure zone containing the excavation. Cable bolts should reach the area of the natural pressure arch, this arch also contains the area of the highest stress concentration
What is an artificial pressure arch
when dowels and bolts generate a pressure arch based off the close spacing of the bolts.
What are australian bolting methods in relation to the failure zone
rock bolts are used outside the excavation while cable bolts are used to extend into the failure zone
what is the candian and scandinavian methodolgy for bolting in terms of the failure zone
rock bolts only are typically utilised and they are contained within the failure zone. No bolting is extended out past the failure zone.
What is south african bolting practices
utilising a mix of short and medium bolts contained within the failure zone
what is the ground reaction curve
it is an analytical solution usining rock support analysis and design of support for circular tunnel when the horizontal and vertical stresses are assumed to be the same.
what are some key features of the radial deformation in roof and floor of advancing tunnel
*redial displacement reaches its final value at aboutn one and a half tunnel diameters behind the face
*it is about one third of its final value at the tunnel face
*starts at about one half of the diameter ahes of the advancing face.
