FUNDAMENTAL STUDY OF THE INTERNAL FAILURE OF STRATIFIED ROCK /IN JAPANESE/

A VERY STRATIFIED ROCK CONTAINS AT LEAST TWO SETS OF JOINTS ORIENTED AT APPROXIMATELY RIGHT ANGLES TO THE BEDDING PLANES AND THESE JOINTS CONSTITUTE A SOURCE OF MECHANICAL WEAKNESS. IN ORDER TO INVESTIGATE THE INTERNAL FAILURE IN VARIOUS STRATIFIED ROCKS DUE TO LOCAL YIELD, SUCH AS LOCAL FAILURE CAUSED AROUND AN EXCAVATED TUNNEL, A MODEL TEST WAS CARRIED OUT USING A PILE OF BLOCKS MADE OF VINYL CHLORIDE. IN THE MODEL TEST, THE BLOCKS WERE PILED UP IN THE HORIZONTAL, INCLINED AND VERTICAL STRATA. THE HORIZONTAL STRATA WERE CLASSIFIED AS BEING OF THREE TYPES; CHECKED JOINT, SYMMETRICALLY STAGGERED JOINT, AND UNSYMMETRICALLY STAGGERED JOINT. THE INTERNAL FAILURE IN THE STRATIFIED PILE WAS SIMULATED BY GRADUALLY LOWERING A PANEL WHICH FORMED A PART OF THE HORIZONTAL BASE UNDER THE PILE OF BLOCKS. FROM THE TEST RESULTS, IT IS OBSERVED THAT THE FAILURE ZONE MAY BE DIVIDED INTO THE PRIMARY FAILURE ZONE WHICH USUALLY ACCOMPANIES THE LOWERING OF THE PANEL AND THE SECONDARY FAILURE ZONE WHICH APPEARS AROUND IT IN CERTAIN CONDITIONS. THEN THE RELATION TO DETERMINE THE CONDITION IS STUDIED. THIS CONDITION IS INFLUENCED BY DB (D: DEPTH OF THE BLOCKS, B: WIDTH OF THE LOWERING PANEL) AND THE CRITICAL VALUES OF D/B BELOW WHICH THE SECONDARY FAILURE ZONE APPEARS ARE OBTAINED FROM THE CONSIDERATION OF THE FAILURE MECHANISM. THE STABILITY FOR THE DEVELOPMENT OF THE FAILURE ZONE CAUSED BY A SMALL DISTURBANCE IS DISCUSSED. ROCK LOAD ON TUNNEL SUPPORTS CAN BE ESTIMATED FROM THIS STUDY. /RRL/A/

  • Supplemental Notes:
    • No 12b, pp 147-160
  • Corporate Authors:

    Kyoto University

    Disaster Prevention Research, Gokasho
    Uji City, Kyoto,   Japan 
  • Authors:
    • Murayama, S
    • Ishii, Y
    • Matsuoka, H
  • Publication Date: 1969-3

Subject/Index Terms

Filing Info

  • Accession Number: 00234917
  • Record Type: Publication
  • Source Agency: Road Research Laboratory /UK
  • Files: TRIS
  • Created Date: Oct 19 1970 12:00AM