GEOLOGICAL ENGINEERING INVESTIGATION OF TALUS SLOPES IN LEWISTOWN NARROWS, PENNSYLVANIA

IN RIDGE AND VALLEY PROVINCE OF CENTRAL PENNSYLVANIA, UNCONSOLIDATED TALUS AND COLLUVIUM COVER MANY OF THE HIGHWAY CORRIDORS THROUGH WHICH CONSTRUCTION IS NECESSARY PRESENTING A MAJOR PROBLEM. IN SOLVING THESE PROBLEMS, THE GEOLOGICAL ENGINEER MUST UTILIZE MANY OF THE TOOLS OF GEOTECHNICS, SUCH AS ROCK MECHANICS, GEOPHYSICS, FIELD GEOLOGY AND AIR PHOTO INTERPRETATION. THE STUDY REPORTED ON OUTLINES A METHOD OF APPROACH FOR TALUS AND SCREE COVERED SLOPES. THE AREA STUDIED LIES SOUTH OF LEWISTOWN, PENNSYLVANIA, ALONG THE JUNAITA RIVER, IN THE "LEWISTOWN NARROWS". IT IS A STEEP, NARROW SYNCLINAL VALLEY WITH TALUS COVERED SLOPES. AN EXISTING ROAD AND RAILROAD LOCATED IN THIS VALLEY FORCE PROPOSED ROADWAYS TO CROSS AREAS OF EXTENSIVE TALUS. A DETAILED GEOTECHNICAL INVESTIGATION WAS PERFORMED USING A SEISMIC REFRACTION SURVEY TO DELINATE THE EXTENT OF TALUS. ANALYSES WERE COMPLETED REGARDING THE SLOPE STABILITY OF THE PROPOSED CONSTRUCTION. UPON COMPLETION OF THIS INVESTIGATION THE GEOLOGICAL ENGINEER WAS ABLE TO PRESENT RECOMMENDATIONS TO THE DESIGNER REGARDING THE FEASIBILITY OF LOCATING THE HIGHWAY IN THIS TYPE OF AREA. /AUTHOR/

Media Info

  • Features: Figures; References;
  • Pagination: p. 11-31

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Filing Info

  • Accession Number: 00230220
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Oct 24 1973 12:00AM