how to draw a laneway/tunnel dynamically and simulate bombed hole

hello, everyone! I wanna to draw a laneway/tunnel dynamically and then bomb it, and i also want to simulate the bomb effect, when the bomb explode, there should be a hole and some other shatters on the laneway/tunnel. i have realized the shatters' effect, but i do not know how to draw the laneway/tunnel and the hole dynamically.Is there a good idea? Any answer will be appreciated!