Validation of a FEM computer programme for underground excavations in jointed rock

Abstract

ABSTRACTThe paper discusses the validation of a two-dimensional finite-element Phase2 programme using various approaches to verify and compare for underground excavations in rock and jointed rock. Corresponding to the analysis of underground openings, the behaviour between circular and horseshoe-shaped underground excavation, with and without rock bolt and/or lining supports, is carried out using the numerical modelling software Phase2. The analysis of the model is compared with analytical solutions using two other numerical software packages – Plaxis and Universal Distinct Element Code (UDEC) – as well as a case study using field data recorded from one of the Hong Kong tunnel projects. As Phase2 is not a universal computer programme for solving all soil and rock engineering problems, the key assumptions and theory of the programme and its limitations are discussed. The results of the study show that the Phase2 numerical modelling programme provides satisfactory agreement with different verification cases...