PROCEDURE FOR AND ACTION OF A COMPOSITE METHOD OF SECURING ROCK IN CIVIL ENGINEERING USING PLASTICS

HERSTELLUNGSVERFAHREN UND WIRKUNGSWEISE EINES VERBUNDVERBAUES ALS GEBIRGSSICHERUNG IM UNTER- UND OBERTAGEBAU MIT KUNSTHARZEN

THE COMPOSITE METHOD OF SECURING ROCK WITH SYNTHETIC RESINS CONSISTS OF TWO PROCEDURES: FIRST THE INCORPORATION OF FLUID ROCK ANCHORS MADE OF EPOXY RESINS REINFORCED WITH GLASS FIBRE SYNTHETIC RESIN BARS AND TUBES (DOWELS) INTO BOREHOLES WHICH PENETRATE THE ROCK SURROUNDING THE CAVITY, AND SECONDLY THE MULTIPLE COATING OF THE WALL OF THE CAVITY WITH SYNTHETIC RESIN WHICH BONDS TO THE SYNTHETIC RESIN OF THE DOWEL AT THE MOUTH OF THE BOREHOLE. THIS RESULTS IN A BOND BETWEEN THE DOWELLING AND THE SURFACE COATING. BECAUSE OF THEIR HIGH STRENGTH AND WIDE AREA OF DEFORMABILITY SYNTHETIC RESINS ARE VERY USEFUL IN AUSTRIAN TUNNEL CONSTRUCTION. SYNTHETIC RESIN HAS A LOW MODULUS OF ELASTICITY (SLOWER BUILD-UP OF RESISTANCE FORCES), GREATER FINAL STRENGTH, SHORT HARDENING TIME (1 HOUR) AND IS IMPERMEABLE TO WATER AND GAS. IT IS MADE OF THREE COMPONENTS (BASIS MATERIAL, HARDENER, FILLER) AND PLASTIC FLOW IS PREVENTED BY ITS THIXOTROPY. THE METHOD IS ESPECIALLY SUITABLE FOR COMPRESSIVE, PSEUDOPLASTIC AND NON-COHESIVE ROCK.