Remediation of the SR 15 Welcome Center Landslide

This paper will discuss a 2004 landslide that resulted in the closure of the southbound lanes of SR 15 in northern Tioga County approximately one half mile north of the Pennsylvania Welcome Center and 6 miles south of the New York State border. The landslide measured approximately 800 feet along the head scarp and 400 feet from the head scarp to the toe. Total vertical displacement at the head scarp was approximately 20 feet. Forty‐four borings were drilled to investigate the subsurface conditions in the area of the landslide. Soil samples collected from the borings were tested in the laboratory to estimate the engineering properties of the site soils. The tests included direct and triaxial shear. Inclinometer casing was installed in 13 of the borings, and piezometers were constructed in 12 of the borings. The computer program PASTABL was used to perform the slope stability analyses. Numerous alternatives were considered to remediate the landslide. The selected alternative included: realignment of SR 15 and Park Hill Road, load reduction (excavation) at the landslide head, construction of a soil berm at the toe, and placement of a chimney (blanket) drain behind the toe berm. Construction was completed in 2007 for a cost of approximately 3 million dollars. Inclinometer readings continue to be obtained to monitor the area.

  • Corporate Authors:

    New York State Thruway Authority

    200 Southern Boulevard, P.O. Box 189
    Albany, NY  United States  12201-0189
  • Authors:
    • Scherer, David R
    • Johnson, Robert E
    • Lewis, Paul J
  • Conference:
  • Publication Date: 2009

Language

  • English

Media Info

  • Media Type: CD-ROM
  • Features: Figures; Photos; Tables;
  • Pagination: pp 35-48
  • Monograph Title: Proceedings of the 60th Highway Geology Symposium

Subject/Index Terms

Filing Info

  • Accession Number: 01142320
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Oct 20 2009 4:38PM