SEISMIC EFFECTS ON EARTH DAM FROM EXPLOSION

IN ORDER TO DETERMINE BY FULL-SCALE TEST, THE APPLICABILITY OF CURRENT SEISMIC DESIGN PROCEDURES TO THE DESIGN OF EARTH AND ROCKFILL DAMS THAT ARE SUBJECTED TO EARTHQUAKE EFFECTS, THE MOTION OF 120 FT HIGH, 1500-FT LONG ROLLED EARTH FILL DAM WAS MEASURED DURING ITS RESPONSE TO THE GROUND MOTION EFFECTS PRODUCED BY A DEEP UNDERGROUND NUCLEAR DETONATION. A TWO-DIMENSIONAL FINITE ELEMENT MODEL REPRESENTING THE 100-FT DEEP ALLUVIAL FOUNDATION OF THE DAM WAS USED TO COMPUTE THE MOTION OF THE SURFACE OF THE ALLUVIUM AND OF VARIOUS POINTS IN THE DAM. THE LOCATION OF THE ACCELEROMETERS TO MEASURE DAM MOTION IS DESCRIBED. THE DAM BEGAN TO MOVE 6.9 SEC AFTER DETONATION, SO THE PRIMARY WAVE-PROPAGATION VELOCITY WAS A LITTLE MORE THAN 14,000 FPS. THE MOTION RECORDS WERE DIGITIZED AND THE ACCELERATION RESPONSE SPECTRA WERE COMPUTED USING A COMPUTER PROGRAM. THE 2 DIMENSIONAL FINITE ELEMENT COMPUTER PROGRAM FOR THE ANALYSIS OF DAMS AND FOUNDATIONS UNDER THE INFLUENCE OF EARTHQUAKES MOTION EFFECTS, WAS USED TO CALCULATE THE PEAK ACCELERATION AND ACCELERATION RESPONSE SPECTRA FOR AN IDEALIZED REPRESENTATION OF THE FOUNDATION AND DAM. DETAILS ARE GIVEN OF THE COMPUTER PROGRAM. TYPICAL COMPUTER RESPONSE SPECTRA ARE ILLUSTRATED. AGREEMENT BETWEEN MEASURED AND COMPUTED ACCELERATIONS AND SPECTRA WAS IMPROVED BY INCREASING THE MEASURED FIELD MODULUS BY 50 PERCENT. COMPARISON OF THE PEAK MEASURED ACCELERATIONS AND THE PEAK COMPUTED ACCELERATIONS ARE TABULATED. GOOD AGREEMENT WAS FOUND IN THIS AREA. RESULTS INDICATE THAT THE METHOD OF ANALYSIS DESCRIBED HERE, IS AN APPROPRIATE TOOL FOR THE ANALYSIS OF DAMS AND FOUNDATIONS SUBJECTED TO EARTHQUAKES.

  • Authors:
    • Heller, L W
  • Publication Date: 1973-11

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Filing Info

  • Accession Number: 00236769
  • Record Type: Publication
  • Report/Paper Numbers: Tech Notes
  • Files: TRIS
  • Created Date: Apr 3 1974 12:00AM