STUDY OF MEASURING RINGS IN UNDERGROUND STRUCTURES. STUDY OF ANCHORAGE BOLTS

ETUDE DES ANNEAUX DE MESURE EN SOUTERRAIN - ETUDE DES BOULONS D'ANCRAGE

TO CONTINUE THE STUDY OF THE LONG-TERM BEHAVIOUR OF LPC MEASURING BOLTS (CREEP AND RELAXATION TESTS). SIMULTANEOUSLY THE SEALING OF ANCHORAGE BOLTS WILL BE STUDIED IN ORDER TO DETERMINE THE INFLUENCE OF THE MAIN PARAMETERS CONDITIONING SEALING QUALITY (NATURE OF SEALING POINTS, CONDITIONS OF INSTALLATION, TYPES OF STEEL USED, INFLUENCE OF THE STATE OF FRACTURE OF THE ROCK, AND PRESENCE OF OPEN FRACTURES IN THE SEALING ZONES). THE TESTS UNDERTAKEN TO STUDY THE CHARACTERISTICS AND BEHAVIOUR OF ANCHORAGE BOLTS WILL BE CONTINUED (STUDY OF BEHAVIOUR UP TO FAILURE POINT, IN PARTICULAR AS REGARDS EXTENSION).