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Soil Nails and Shotcrete Facing Used to Stop Sloughing on a 1:1 Slope Caused by Excessive Rainfall
December, 2006
Project Overview
Continuous very heavy rains caused sloughing of the soils above an existing soldier pile wall. A 1:1 cut had been created from the adjacent property line to the solider pile wall, and the slope was failing. There was significant concern about the impact on the adjacent office building if the sloughing was allowed to continue unchecked. The forecast for continued rainfall led to the urgency for the construction of a soil nail and shotcrete facing to stabilize the slope. Helical screw anchors were chosen for this project because of the ability to install them with small, hand-portable equipment, the lack of spoils, the immediate verifiability of the anchor capacities and the ability to immediately apply shotcrete after anchor installation.
Two crews were mobilized to work off man-lifts to install the anchors to depths ranging from 32 to 38 lineal feet with torques up to 4,600 ft. Lbs. The anchors were installed in two rows, 7 to a row with one verification load test performed on an anchor in each row. Although the sloughing had created a bench to work from at some of the anchor locations along the top row, the sloughing created a dangerous slope along the lower row thus requiring crews on the slope to be roped and tethered at all times to anchors installed in the foundation of the adjacent building.
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