THE SAN FERNANDO EARTHQUAKE SOILS AND GEOLOGIC INVESTIGATIONS IN RELATION TO HIGHWAY DAMAGE

THE OVERALL OBJECTIVE IS TO DEVELOP RECOMMENDATIONS CONCERNING DESIGN AND CONSTRUCTION FOR MINIMIZING DISTRESS OF HIGHWAY EARTHWORK DURIN FUTURE EARTHQUAKES. THIS REPORT DESCRIBES THE EFFECTS OF THE SAN FERNANDO EARTHQUAKE ON FREEWAY EARTHWORKS. GENERALLY CUT SLOPE PERFORMANCE WAS GOOD ALTHOUGH THREE SLIDES DID OCCUR IN VERY LARGE CUTS. TWO DEVELOPED IN THE UPPER PORTIONS OF THE SLOPES AND DID NOT COLLAPSE COMPLETELY. EMBANKMENTS WERE SUSCEPTIBLE TO SHEAR FAILURE, SUBSIDENCE CAUSED BY DENSIFICATION, SPREADING, AND LONGITUDINAL AND TRANSVERSE CRACKS. DAMAGE TO FILLS CAUSED BY SHEAR FAILURE WAS CONSIDERED MINOR ALTHOUGH THREE SLIPOUTS DID DEVELOP IN VERY GOOD MATERIAL. WIDESPREAD SETTLEMENT AT BRIDGE APPROACHES OCCURRED ON ALL FREEWAYS SURVEYED FOR DAMAGE. PRELIMINARY DESIGN RECOMMENDATIONS INCLUDE THE USE OF (1) FLATTER CUT SLOPES, (2) LONGER AND STRONGER BRIDGE APPROACH SLABS, AND (3) APPROPRIATE SEISMIC LOAD FACTORS BASED ON POTENTIAL SEISMIC INTENSITY, ESTIMATED DYNAMIC RESPONSE OF THE FOUNDATION MATERIAL, AND THE CONSEQUENCES OF FAILURE OF THE FACILITY. /AUTHOR/

  • Corporate Authors:

    Federal Highway Administration

    1200 New Jersey Avenue, SE
    Washington, DC  United States  20590

    California Division of Highways

    Bridge Department
    Sacramento, CA  United States  05914
  • Authors:
    • Prysock, R H
    • Egan, J P
  • Publication Date: 1971-9

Subject/Index Terms

Filing Info

  • Accession Number: 00228677
  • Record Type: Publication
  • Source Agency: Federal Highway Administration
  • Report/Paper Numbers: Study No D-5-43
  • Files: TRIS, USDOT
  • Created Date: Feb 15 1972 12:00AM