Hardrock Flashcards
1
Q
What is a pressure (coal) bump
A
dynamic release of energy within the rock mass, displacement of existing loose material
2
Q
What is a pressure (coal) burst
A
a pressure bump causes consequence dynamic rock failure in the vicinity of the mine opening
3
Q
What is an outburst
A
where gas pressure is the main source and there is a dynamic release of energy leading to a displacement of the rock
4
Q
factors influenceing coal burst and damage
A
*geotechnical
*geology
*mining
*seismicity
5
Q
What are some features of the CPT and piezocone
A
*measure the forces required to push instrument into the ground
*mechanical cone is labour intensive
*electric cone is most used
*it gives results in the field
6
Q
What are the outputs for the CPT
A
*cone resistance
*sleeve? resistance
*friction ratio
