Abstract
Many large civil engineering projects require deep excavations, which frequently encounter rock. Deep excavations in rock require careful evaluation of the site geologic conditions. For the clinch river breeder reactor project, a 100-ft deep excavation with nearly vertical slopes was performed. Controlled blasting methods and a rock support system consisting of approximately 3000 high-capacity rock bolts were required to assure the stability of the slopes. During excavation, modifications to the original rock support system and excavation slopes were required to accommodate the geologic conditions. This paper discusses the geologic factors and engineering considerations influencing original excavation design and subsequently resulting in modifications to that design. Recommendations for designing excavations in rock are presented.(a)
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