517
Technical Committee 102 /
Comité technique 102
Proceedings of the 18
th
International Conference on Soil Mechanics and Geotechnical Engineering, Paris 2013
Chenyulen
Creek
Figure 7. Failure caused by River Channel Erosion of Roadbed
(Provincial Highway 21).
Dip Slope
Figure 8. Failure caused by Dip slope (County Road 179-1 in Nantou
County).
Circular Failure
Figure 9. Failure caused by Circular Failure of Slope (At 3K of
Road 179 in Nantou County).
County
ColluviumFailure
Area
Figure 11. Failure caused by Deep Sliding Failure of Colluvium (Xin Fa
Village in Kaohsiung City).
Erosion of Top
Roadside Slope
≒
50m
≒
205m
River Channel
Erosion of Roadbed
Figure 12. Failure caused by Complex Failure Mechanism (County
Road 64 in Taitung County).
res and Mechanism No.2, No.4 and
No
RESTORATION PROJECTS AND FUTURE PROJECTS
rom
In general, Mechanism No.1, No.3 and No.5 were main
mechanisms of road failu
.5 were main mechanisms of slopeland failures. These five
mechanisms caused most of failures in “88” Flood.
3 STRATEGIES AND SUGGESTIONS TO
From survey observations and analyses, strategies to prevent
future slopeland and road failures can be outlined starting f
following aspects: (1) debris flow control and river remediation,
(2) proper treatment of landslides, (3) soil and water
conservation of slopeland and (4) soil and water conservation of
road.
Furthermore, improvements of road designs can be done to
avoid slopeland and road failures in the design phase: (1)
co
Figure 10. Failure caused by Barrier Lake (County Road 179-1 in
Nantou County).
nsider and prevent all possible failure mechanisms, (2) use
rock shed in potential rock fall area (see Figure 13), (3) from
survey observations, the tunnel and bridge are the best solution
for roads in potential debris flow area (see Figure 14), (4) use
deep foundation (e.g. pile foundation) as retaining wall at
bottom roadside slope retaining wall to avoid erosion. If the
roadbed can be protected from erosion, it is easier and faster for
future road restorations. (5) avoid area where river channel
erosion occurs and (6) install proper water drainage system for
slopelands (see Figure 15).
