Lithology does not affect which parameter?

The underground routes or passages driven through the ground without disturbing overlying soil cover are called ______

Which type of geological structure can be rectified by grouting?

What occurs due to falling of big rock blocks or sides due to release of stresses during tunnelling?

When can the rocks act as a natural arch?

Pick the rock considered as soft rocks for tunnelling.

Pick the tunnel which is not a sub-group of traffic tunnels.

Which outline is preferred for weak rocks with unequal lateral pressure?