Glen Haven Road PM 0.81 Storm Damage
Soquel, Santa Cruz County, CA
Glen Haven Road is a lightly-travelled 20-foot wide paved road that has experienced road failure along a stretch about 35 ft long. There is a residential home located about 50 ft downslope from the slip out scarp that appears to have been damaged by the slope failure.
The failure is predominately an earthflow feature that extends from the road level to the toe located downslope at a horizontal distance of approximately 20 to 30 ft; deposits of the slide debris continues for 20-30 ft further downslope. The failure appears to be mostly confined to the historical fill material above highly weathered to decomposed siltstone.
CAInc prepared a Preliminary Geotechnical Memorandum, which included a description of subsurface conditions and an evaluation of the geologic setting. Based on boring data and site observations, CAInc considered several repair options, including:
- Typical reconstructed embankment with finished slope at 2:1 (horizontal:vertical)
- Reinforced embankment with finished slope of 1.5:1
- Gravity wall system (cribwall, MSE, gabion, etc.)
- Rock slope buttress
- Roadway realignment
- Soldier Pile Wall, traditional construction
- Soldier Pile Wall, low overhead construction
The Soldier Pile Wall option was considered most feasible, and preliminary recommendations were provided for vertical soldier piles, anchor piles, sub-drainage, and backfill.