I am reviewing alternative slope stabilization options for a failing 2:1 slope that is 30 feet high and about 100 feet in length. The 10 feet of soil overburden (silty, lean clay with gravel) is on top of about 20 feet of highly weathered shale which transitions into highly fractured shale with interbedded limestone near the toe of the slope. Two options for consideration are 1) benching the slope in a stair-step fashion and using gabion baskets wrapped in non-woven geotextile, with compacted soil above the baskets, a TRM and sod OR 2) installing a sheet pile wall and tie-back system midslope, using TRM and sod with over the backfill. I am not sure about the sheet pile wall because I see drainage being an issue there.
Any comments or suggestions regarding either alternative would be greatly appreciated.
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