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- W652757368 abstract "AMONG THE METHODS USED IN THE CONSTRUCTION OF UNDERGROUND CAVITIES IN ROCKS WITH RESIDUAL TECTONIC STRESSES NOWADAYS, THE NEW AUSTRIAN TUNNELLING METHOD REPRESENTS THE MOST ECONOMIC SOLUTION IF ONE LOOKS AT THE OVERALL COSTS. ONLY A PORTION OF THE ROCK STRESSES MUST BE CARRIED BY THE SUPPORT SYSTEM, BECAUSE THE MAJOR PORTION OF THE STRESSES IS RELIEVED BY DEFORMATION. THIS IS ACHIEVED BY THE STAGEWISE INSTALLATION OF FLEXIBLE SUPPORTS, THE STIFFNESS OF THE SUPPORTS INCREASING GRADUALLY. THE SUPPORTS MUST PREVENT FURTHER DISINTEGRATION AND FACILITATE STRESS RELAXATION BY THEIR DEFORMATION BEHAVIOUR. TODAY GUNITE, WELDED REINFORCING MESH, ROCK ANCHORS, STRUCTURAL STEEL AND TUNNELLING ARCHES ARE AVAILABLE TO US FOR THIS PURPOSE. FURTHER IMPROVEMENTS IN DEFORMATION BEHAVIOUR CAN BE ACHIEVED BY THE USE OF NEW MATERIALS WITH DIFFERING PROPERTIES (PLASTICS, ETC) AND CHANGES IN CONSTRUCTION METHODS (MOVEMENT JOINTS, ETC). TO ENSURE CORRECT TIMING OF THE INSTALLATION OF THE SUPPORTS, SIZE AND SHAPE OF THE AREAS TO BE EXCAVATED MUST BE ADAPTED TO ANTICIPATED GEOLOGICAL CIRCUMSTANCES. FIRM STATEMENTS ABOUT THE NECESSARY SUPPORT AND THE TIMING OF INSTALLATION CAN ONLY BE MADE WHEN THE CONDITIONS IN THE ROCK AND THE LINING ARE ACCURATELY KNOWN FROM CONTINUOUS MEASUREMENTS. THESE MEASUREMENTS MUST BE MORE CLOSELY SPACED WHERE HIGHER ROCK STRESSES ARE ANTICIPATED. THIS PAPER WAS PRESENTED AT THE HANS-CLOOS CONFERENCE ON GEOMECHANICS, HELD 14TH & 15TH OCTOBER, 1976, IN SALZBURG." @default.
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- W652757368 date "1978-01-01" @default.
- W652757368 modified "2023-09-27" @default.
- W652757368 title "TUNNELLING METHODS IN ROCKS WITH RESIDUAL TECTONIC STRESSES" @default.
- W652757368 hasPublicationYear "1978" @default.
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