Rockbolt provide a convential means of strengthening underground openings and stablizing cut slopes in rock. It is therefore important to check that installed Rockbolts will not fail through over loading.
The Instrumented Rockbolts comprise a hollw ribbed steel bar fitted with upto four internal extensometer rods. Movement of one or more of extensometer rods in relation to the measuring head is monitored by inserting a dial depth gauge into the appropriate aperture in the measuing head.

Measurement of Rockbolt loads.
Monitor the behaviour of jointed roof and floor strara during variuos mining/tunnelling stages.
To determine the magnitude of loads on roof supports.