Divide the rocks towards the establishment of tunnels

1. Coherent rocks: 

rocks consistent with no breaks were not affected by any movements in the floor. 

2. Rock mass:  

the rocks in the form of separate blocks because of its exposure to movements of the floor. 

3. Rocks with commas conjunctivitis:  

rock breaks of docked with each other by material for boiler over time. 

4. Stratified rocks: 

rocks exist in the form of layers and less breaking strength of the strains at levels of compliance. 

5. Broken rock: 

rock smashed into small pieces under the influence of various stresses without the occurrence of chemical changes. 

6. Expansive rock: 

containing minerals such as clay Boggy. 

  7. Rock cruise: 

containing minerals such as clay, smooth flow.