This research provides the first steps in studying of Rock Mass - Shotcrete Interface behavior in creep process like the adherence generated in the interaction of both, which is determined by applying the criterion of shear strength for rough joints of Barton using destructive techniques like direct shear tests in samples physically simulated in laboratory.

Through the simulation, which allows designing models of real systems to experiment and understand the system behavior under evaluation, it was come to recreate physically in laboratory the parameters obtained during the rock mass geomechanical mapping. Parameters like the compressive strength and roughness joints were physically simulated using a high strength concrete at an age of 120 days. For shotcrete, it was come to assemble in laboratory a machine that simulates the process through compressed air and gravity flow.

Rock Mass - Shotcrete Interface at low age was simulated physically in 20 test samples were subjected by direct shear tests, in groups according to the different low ages of shotcrete.

1. Introduction

The research focuses on the study of the shear strength parameters of the simulated rock mass - shotcrete interface at low ages in terms of adherence in samples physically simulated in laboratory, using the empirical model for rough joints of Barton.

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