PFC3D numerical modelling of round determinate panel test for shotcrete

摘要

ASTM CI 550, as applied to the round determinate panel (RDP) test, is the industiy standard test for determining the load versus deflection capacity of shotcrete. The RDP test consists of a round panel supported on three pivoting points where a central platen applies a load at a constant velocity until failure of the panel occurs. At failure of the shotcrete matrix, three hairline cracks are formed and an abrupt drop in load is registered. The post peak behaviour of the RDP depends on the presence, or absence, of fibres in the matrix given that the addition of fibres contributes to the residual strength of the material. Fibre reinforced shotcrete (FRS) is commonly used to support underground excavations, especially for weak and/or highly stressed rock masses. Three-dimensional particle flow code (PFC3D?) manipulates effectively the interaction of bonded fictitious spherical particles, in order to model or simulate synthetic materials, and this in fact is an ideal option for analysing fibre reinforced shotcrete. This paper uses the PFC3D modelling procedure to assess RDP tests under quasi-static loading.