Mohammad Fatehi Marji
West Indies
Research Article
A New Method to Predict Ratio of Width to Height Rock Pillar in Twin Circular Tunnels
Author(s): Asghar Siahmansouri, Javad Gholamnejad and Mohammad Fatehi MarjiAsghar Siahmansouri, Javad Gholamnejad and Mohammad Fatehi Marji
Twin tunnels can be used for many applications. Interaction between two tunnels is an important problem in tunnel engineering that should be studied specially. Numerical investigations are well adapted to field data and numerical methods can be used in design of rock pillar of twin circular tunnels. So far no relationship has been provided to estimate the minimum stable rock pillar. In this paper the interaction between twin circular tunnels has been studied using 2D finite element analysis. To do this, a great number of twin tunnels were modeled in Phase2 software with different conditions of rock mass (RMR value) and depth of tunnel. Models were analyzed and minimum stable rock pillar was determined. This process was repeated for three different ratios of K (ratio of horizontal stress to vertical stress, 0.5, 1 and 1.5). Finally, according to the linear and nonlinear regression meth.. View More»
