Finite element analysis of rock cavern

Abstract

With the advancement in underground numerical analysis technology, analysis of rock cavern can be easily carried out. This allows studies to be carried out at a faster rate with higher accuracy, thus allowing a better and efficient analysis of it.

This project will utilise Plaxis 2D, a finite element modelling software to carry out analysis on factors that will affect the stability of an unsupported rock cavern during the excavation. In addition, the analysis will also include the Factor of Safety (FS), sidewall movement in conjunction with the given Rock Tunnelling Quality Index (Q-value) of the different rock masses.

The results indicate that the stability of the rock cavern during excavation is affected by the rock mass classifications and lateral earth pressure. In addition, for weaker rock masses, the stability of the cavern is influenced by the size of the rock cavern. With smaller dimensions, the rock cavern will be more stable than a rock cavern with larger dimensions.