filling of red rock

Amalgam fillings

ORIGINAL ROCK FILLINGS

Weak Wall Rock

WEAK SURROUNDING ROCK

weak structures of surrounding rock

weak structure coal and rock

Weak rock zone

Weak Rock Tunnel

Weak rock strata

Weak Rock Mass

weak rock layer

Weak Rock Ground

WEAK ROCK

weak factor of rock mass

Weak Country Rock

weak broken wall rock

weak and hard surrounding rock

Tunnel with weak surrounding rock