red layered weak rock filling

bolted layered rock mass

complex layered rock

char weak rock

coarse-grained soil with weak rock

High slope of weak rock

Loess and Weak Rock highway Tunnel

piles embedded in weak rock

Soft and weak rock

soft and weak rock formation

Soft and weak rock mass

swelling weak rock

Tertiary weak rock

Weak Rock Ground

weak rock layer

Weak Rock Mass

Weak rock strata

Weak Rock Tunnel

Weak rock zone