INVESTIGATION OF RED RIVER VALLEY GEOLOGY EFFECTS ON STRUCTURE DESIGN AND PERFORMANCE

THE INVESTIGATION INCLUDES A DETAILED STUDY OF THE GEOLOGY, PAST PERFORMANCE OF STRUCTURES AND SOIL MECHANICS. THE SITES SELECTED FOR THE STUDY OF THE SOILS AND LANDSLIDES WERE INSTRUMENTED WITH SLOPE INCLINOMETER TO ESTABLISH SHEAR PLANES AND TO EVALUATE THE STRENGTH OF THE SOILS IN THE FIELD AS COMPARED TO LABORATORY STRENGTH ANALYSIS. THROUGH THIS PROCEDURE, THE RESIDUAL SOIL STRENGTHS CAN BE USED FOR DESIGN PURPOSES AND THE REACTIONS IMPOSED ON STRUCTURES CAN BE ESTIMATED. THE MAIN FACTORS CONTRIBUTING TO THE RIVER BANK FAILURES ARE THE LOADS IMPOSED BY EMBANKMENTS AND BY DRAW-DOWN AFTER PERIODS OF FLOODING. RECOMMENDATIONS FOR NEW BRIDGE DESIGN ARE AS FOLLOWS: (1) IF AT ALL POSSIBLE, DO NOT PLACE ANY EARTH FILL ON THE BANKS OF THE RED RIVER. A GEOLOGICAL STUDY OF EACH PROPOSED BRIDGE SITE SHOULD BE CONDUCTED. AN ADEQUATE NUMBER OF BORINGS SHOULD BE DRILLED, AT LEAST ONE BORING SAMPLED CONTINUOUSLY FOR DETECTION OF WEAK ZONES. (2) IF AN EMBANKMENT IS NECESSARY, CONDUCT STABILITY ANALYSES BASED UPON BOTH TRANSLATORY AND ROTATIONAL SLIDES. AND (3) TRANSFER THE STRUCTURAL LOAD TO THE GLACIAL TILL BY THE USE OF END-BEARING PILING. /BPR/

  • Corporate Authors:

    North Dakota State Highway Department

    State Highway Building, Capitol Grounds
    Bismarck, ND  USA  58505

    Bureau of Public Roads /US

    400 7th Street, SW
    Washington, DC  USA  20590
  • Authors:
    • Leer, D K
    • Bell, G L
  • Publication Date: 0

Subject/Index Terms

Filing Info

  • Accession Number: 00228662
  • Record Type: Publication
  • Source Agency: Bureau of Public Roads /US
  • Report/Paper Numbers: (1)-67
  • Files: TRIS, STATEDOT
  • Created Date: Sep 28 1970 12:00AM