Landslide Remediations for Highway Projects in Western PA - All Sites are Unique-PPT Presentation

PPT Presentation

Pdf Summary

The presentation explains how landslide remediation for highway projects in western Pennsylvania requires site-specific solutions. The process includes reconnaissance and office review, subsurface investigation and laboratory testing, back-analysis to develop a design model, assessment of constraints, and remedial design.<br /><br />Key considerations include soil and bedrock conditions, emergency schedules, nearby waterways and sensitive areas, slope and roadway geometry, mining, and the length and duration of traffic detours.<br /><br />Five projects illustrate different approaches. At SR 2017 Blythedale Road, mining and a mapped mine opening led to embankment removal and replacement, plus mine grouting. At SR 4063 Pearce Mill Road, deep soils, claystone, and nearby private property prompted structural elements and lightweight backfill. At SR 4070 Wildwood Road, repairs included soil nails installed through existing gabions and, at another slide, a steepened rock embankment with a geogrid-reinforced soil slope. At SR 30, weak claystone, a high slope, nearby homes, and limited detour capacity required embankment reconstruction and a soldier-pile-and-lagging wall.<br /><br />Reported construction costs ranged from about $1.1 million to $6.5 million for these examples. A comparison of other Pennsylvania DOT projects shows that costs vary considerably by repair type, project length, and number of lanes, reinforcing that remediation must be tailored to each site’s conditions and constraints.

Keywords

landslide remediation

highway projects

western Pennsylvania

site-specific solutions

subsurface investigation

remedial design

soil and bedrock conditions

traffic detours

soil nails

soldier-pile wall