Environmental Engineering Reference
In-Depth Information
Highway cut
FIGURE 9.50
Typical geologic conditions in the Andes
Mountains. Slopes often inclined at 35 to
40°.
To La Paz>
Cotapata Km 0
New Road
Rio
Huarinillo
3000
2000
km 36
Facailo
1000
Old Road
Coroico
FIGURE 9.51
Three-dimensional diagram of a new roadway in the Andes of Bolivia. Steep slopes and irregular landform
results in numerous cuts. See
Figure 9.7
f
or debris avalanches above town of Pacallo, and at km 36,
Figure 9.52.
Ranrahirca and Yungay, Peru
Event no. 1
: One of the most disastrous debris avalanches in modern history occurred in
the Andes Mountains of Peru on January 10, 1962. In a period of 7 min, 3500 lives were lost
and seven towns, including Ranrahirca, were buried under a mass of ice, water, and debris
(McDonald and Fletcher, 1962). The avalanche began with the collapse of Glacier 512 from
