IN SITU AND INDUCED STRESSES AT THE CHURCHILL FALLS UNDERGROUND POWERHOUSE, LABRADOR

STRESS ANALYSIS, UTILIZING THE FINITE ELEMENT TECHNIQUE, WAS USED IN THE DESIGN OF THE UNDERGROUND OPENINGS FOR THE CHURCHILL FALLS HYDRO-ELECTRIC PROJECT. OVERCORING TESTS WERE CONDUCTED TO PROVIDE A QUANTITATIVE MEASURE OF THE THREE-DIMENSIONAL, IN SITU STATE OF STRESS IN THE MASS ROCK AT THE ELEVATION OF THE PROPOSED OPENINGS. THIS STATE OF STRESS, MODIFIED IN THE VERTICAL DIRECTION TO ACCOUNT FOR THE WEIGHT OF THE ROCK, PROVIDED THE LOADING CONDITIONS USED IN THE ANALYSES. IN ADDITION, A LIMITED NUMBER OF OVERCORING TESTS WERE CONDUCTED TO MEASURE THE STRESSES INDUCED IN A MAJOR ROCK PILLAR FOLLOWING EXCAVATION OF THE OPENINGS. TEST RESULTS INDICATED THAT THE THREE-DIMENSIONAL IN SITU STRESSES VARIED IN A RELATIVELY UNIFORM AND PREDICTABLE MANNER THROUGHOUT THE ROCK MASS, AND THEREFORE JUSTIFIED THE SIMPLE BOUNDARY LOADING CONDITIONS CHOSEN FOR THE ANALYSES. THE DEFORMATIONS AND STRESSES INDUCED IN THE ROCK AROUND THE OPENINGS DURING EXCAVATION WERE MEASURED AND WERE FOUND TO BE IN REASONABLY CONSISTENT AGREEMENT WITH THOSE PREDICTED BY THE FINITE ELEMENT MODEL.

  • Supplemental Notes:
    • Vol 2, No 4-60, PP 821-832, 12 FIG, 16 REF
  • Authors:
    • Benson, R P
    • Kierans, T W
    • Sigvaldason, O T
  • Publication Date: 1970

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Filing Info

  • Accession Number: 00236217
  • Record Type: Publication
  • Files: TRIS
  • Created Date: May 22 1972 12:00AM