1.Introduction 1.3 Design Principle Geology Uncertainty Concrete samples ■Every20to50m3 Test about 0.1 percent -See 100 percent out of the truck -Tunnels (samples 100 m) -About 0.0005 percent 百年同海8 8 Geology Uncertainty  Concrete samples  Every 20 to 50 m3  Test about 0.1 percent  See 100 percent out of the truck  Tunnels (samples @ 100 m) About 0.0005 percent 1. Introduction 1.3 Design Principle