I have a contract to build a concrete arch bridge. The thrust blocks for the bridge require excavations up to 45 feet deep. The existing roadway is 20 ft from the corner of the excavation. The material is intensely to moderately weathered metasiltstone. I am looking for a guideline to design an excavation safety plan. Specifically how does one design a rock anchor/ shotcrete face to protect the excavation. From the research I have done it seems that you start digging and than determine if the rock is stable and begin to add anchors if it is not stable. The Contract requires us to have a plan before we start digging.
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