Phase II included the excavation of 7.3 million cubic yards of earth to unload the head of the main landslide and create the new approach to the bridge. The shear pins ranges in depth from 90 to 140 feet including 40 feet of penetration into the shale bedrock. Heavy rains caused 250,000 cubic yards of material to move down hill causing 300 feet of I-70 to move toward the Colorado River and upward as much as 10 feet. Emergency repairs opened the road to full traffic within weeks. Monitoring has revealed that the slope is still moving.
Investigation is ongoing to determine a permanent repair.
Lansing, MI, November 30 - December 4, 1998. Phoenix, AZ, November 10-12, 1998. Columbus, OH, August 12-13, 1998. This is module 7 of the Geotechnical and Foundation Engineering series. The pilot will be held in Amherst, MA, September 30 to October 2, 1998.