Case Studies in Roadway Landslide Repair along Stream Sides, River Banks, Bluffs, and other Sensitive Riparian Areas

摘要

Landslides and severe erosion along our nation’s inland waterways and coastlines canpresent a real challenge to engineers, planners and designers. Not only are the regulatory hurdlesassociated with construction in sensitive riparian and coastal zones significant, many of thecommon tools available either present a large environmental impact or are not robust enough tohandle the corrosion, scour, rapid drawdown, wave action and other erosion processes associatedwith riparian and coastal sites.In the context of case studies from four riparian/coastal projects across the United States,this presentation outlines some of the new and innovative erosion control and landslidemitigation methods that are both robust enough to survive riparian/coastal conditions andspecific enough to prevent unnecessary environmental impact. Relevant technologies includetraditional soil nailing; high capacity tensioned wire mesh with vegetative inclusions and/orseeded turf reinforcement mats; reinforced architecturally sculpted shotcrete; scour micropiles;and fiberglass composite launched (or ballistic) soil nails/horizontal drains.The case studies for this presentation include a Pacific coastal bluff erosion project usingfiberglass ballistic soil nails and architecturally sculpted/stained shotcrete near Crescent City,California; a large landslide repair using integrated soil nails and reticulated micropiles nearPescadero, California; a lakeshore bluff stabilization along the shores of Lake Tahoe, California;and a riparian landslide repair in Virginia.