(KIEWIT) The intent of this project was to mitigate the hazard of wall collapse through the use of wet mix shotcrete shoring. Two separate excavations were shored, the first a circular pit with a depth of 24′ and a diameter of 100′, the other a 22′ depth wall with a length of 135′. The excavator dug out the center of the pit to a depth of 5′, then excavated counter clockwise wall by wall to 5′ depth while the shotcrete crew followed behind spraying shotcrete onto the exposed walls. This method was followed until the entire excavation reached a depth of 5′. After the initial 5′ depth of shotcrete had 72 hours to cure, the excavation continued down another 5’in a counter clockwise motion with the shotcrete team in tow. Double rows of 20′ soil nails were installed 10′ on center for wall stability. Total work time start to finish was 10 weeks.
