The major objective of this study is to check with reasonable assurance that no unacceptable risk to society will result from any adverse consequences caused by static/vibratory ground motions or faulting. This objective can be assured by studying:

• Influence from tunnelling on stresses and strains in the ground formed of different geological conditions.
• Influence on deep tunnels and other underground storages from earthquake.
• Assess the impact of depth, shape, size, orientation, fracture sets and their orientation, fault and other rock mass parameters on tunnel stability under seismic loads.
• Support interaction with tunnel wall and roof under seismic event
• Stability assessment of tunnel-shaft junctions, two closely spaced tunnels and tunnel adjacent to other underground excavations under in-situ stress and seismic loads.
  
  Parametric study will be conducted to achieve the above objectives. In the first step, the stiffness, type and geometry of the structure will be varied. In the second step, the effect of earthquake magnitude, earthquake intensity, the buried depth of the tunnel, the geological conditions, and the underground tunnel model will be investigated.