AN ANALYTICAL-EXPERIMENTAL STUDY OF UNDERGROUND STRUCTURAL CYLINDER SYSTEMS

A STUDY WAS CONDUCTED TO DEVELOP A UNIFIED ANALYTICAL- EXPERIMENTAL TECHNIQUE FOR THE PREDICTION OF SOIL-STRUCTURE INTERACTION TRACTIONS OF NORMAL PRESSURE AND SHEAR ON THE OUTER BOUNDARIES OF UNDERGROUND STRUCTURAL CYLINDERS THAT WOULD BE APPLICABLE TO SYMMETRICAL, UNSYMMETRICAL, SINGLE AND MULTIPLE UNDERGROUND STRUCTURAL CYLINDER SYSTEM INSTALLATIONS. IT WAS DECIDED TO INITIATE A FUND OF KNOWLEDGE RELATED TO THE COMPLETE LOADING DISTRIBUTION ON SINGLE AND MULTIPLE UNDERGROUND STRUCTURAL CYLINDERS IN A REAL SOIL USING MODELS AND TO PROPOSE A MINIMUM HORIZONTAL SPACING CRITERIA FOR MULTIPLE CYLINDER INSTALLATIONS THAT WOULD ALLOW THE USE OF DESIGN DATA FOR A SINGLE UNDERGROUND CYLINDER. THEORETICAL RESULTS WERE USED FOR COMPARISON WITH THE RESPONSE CHARACTERISTICS OBTAINED IN THE EXPERIMENTAL PROGRAM. MATHEMATICAL RELATIONSHIPS WERE FORMULATED THAT PREDICT, IN THE PLANE, GENERAL OUTER BOUNDARY TRACTIONS OF NORMAL PRESSURE AND SHEAR ACTING ON A CIRCULAR CYLINDRICAL SHELL AS A FUNCTION OF ANY ONE OF THREE SETS OF EXPERIMENTALLY DETERMINED QUANTITIES. THE CYLINDRICAL LOADING IS RELATED TO THE INNER BOUNDARY RADIAL AND TANGENTIAL DISPLACEMENTS, CIRCUMFERENTIAL STRESSES, AND INNER AND OUTER BOUNDARY CIRCUMFERENTIAL STRESSES. THE APPLICATION OF ANY ONE OF THESE THREE SETS OF ANALYTICAL- EXPERIMENTAL RELATIONSHIPS TO A PROPERLY INSTRUMENTED UNDERGROUND STRUCTURAL CYLINDER PERMITS THE USE OF THE CYLINDER AS A TRANSDUCER UNDER SYMMETRICAL, UNSYMMERTICAL, SINGLE AND MULTIPLE UNDERGROUND STRUCTURAL CYLINDER SYSTEM CONDITIONS. THE RESULTS OF THE SINGLE CYLINDER SYSTEM TESTS ARE CONSIDERED TO BE REPRESENTATIVE OF A WIDE RANGE OF FLEXIBLE INSTALLATIONS. THE IDEALIZED MATHEMATICAL MODEL FOR A CIRCULAR CYLINDRICAL SHELL EMBEDDED IN AN ELASTIC MEDIUM PROVIDES A USEFUL APPROACH TO THE STUDY OF UNDERGROUND STRUCTURAL CYLINDERS. THE PERTINENT SOIL MODULUS, GIVEN BY THE CONSTRAINED MODULUS OF ELASTICITY, MAY BE DETERMINED FROM A CONFINED STRESS-STRAIN CURVE OF THE SOIL. THE EFFECT OF THE PASSIVE ARCHING PHENOMENON ON THE CENTER CYLINDER OF AN EQUALLY SPACED, FLEXIBLE, THREE-CYLINDER SYSTEM EMBEDDED IN A COHESIONLESS SOIL MAY BE APPROXIMATED WITH AN APPLICATION OF A UNIFORM LOADING ON THE CENTER CYLINDER ABOVE THAT WHICH WOULD EXIST UNDER EQUIVALENT SINGLE CYLINDER SYSTEM CONDITIONS.

  • Supplemental Notes:
    • Tech Rept NO 59, 234PP, 28 FIG, 18 TAB, 39 REF, APP
  • Corporate Authors:

    New Mexico State University, Las Cruces

    Engineering Experiment Station
    Las Cruces, NM  USA  88001
  • Authors:
    • Stankowski, S
    • Nielson, F D
  • Publication Date: 1969-10

Subject/Index Terms

Filing Info

  • Accession Number: 00204289
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jun 22 1970 12:00AM