Abstract
DETAILS ARE GIVEN OF THE PRINCIPLES OF A DESIGN METHOD FOR TUNNEL SUPPORTS TAKING INTO ACCOUNT THE PROXIMITY OF THE FACE WHEN THE SUPPORT IS BEING INSTALLED. FOR A TUNNEL WITH A CIRCULAR SECTION EXCAVATED IN A PERFECT ELASTIC OR ELASTOPLASTIC MEDIUM WITH INITIAL HYDROSTATIC STRESSES, THE POSSIBILITY IS SHOWN OF REDUCING THE PROBLEM TO THAT OF PLANE DEFORMATION BY INTRODUCING A FICTITIOUS INTERNAL PRESSURE WHICH SIMULATES THE SUPPORT EFFECT OF THE FACE. THIS METHOD IS BEING CHECKED AND GENERALIZED WITH LESS RESTRICTIVE ASSUMPTIONS ON INITIAL STRESSES AND ON THE BEHAVIOUR OF THE ROCK MASS. FOR THE COVERING ABSTRACT SEE IRRD ABSTRACT NO 107559.
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