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Geomechanics and Engineering
  Volume 11, Number 2, August 2016 , pages 269-288

Analysis of stress distribution around tunnels by hybridized FSM and DDM considering the influences of joints parameters
Nooraddin Nikadat and Mohammad Fatehi Marji

    The jointed rock mass behavior often plays a major role in the design of underground excavation, and their failures during excavation and in operation, are usually closely related to joints. This research attempts to evaluate the effects of two basic geometric factors influencing tunnel behavior in a jointed rock mass; joints spacing and joints orientation. A hybridized indirect boundary element code known as TFSDDM (Two-dimensional Fictitious Stress Displacement Discontinuity Method) is used to study the stress distribution around the tunnels excavated in jointed rock masses. This numerical analysis revealed that both the dip angle and spacing of joints have important influences on stress distribution on tunnel walls. For example the tensile and compressive tangential stresses at the boundary of the circular tunnel increase by reduction in the joint spacing, and by increase the dip joint angle the tensile stress in the tunnel roof decreases.
Key Words
    boundary element method; dip; spacing; joint; tunnel
Department of Mine Exploitation Engineering, Faculty of Mining and Metallurgy, Yazd, Iran.

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