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Tunnels are underground passages used for different purposes like to carry traffic, water, power cables, sewage, gas etc. They are generally made up of soil or rock. It is necessary to identify the stability of tunnel. There are many factors affected on stability of tunnel, in which the existence of groundwater is the most important factor. The pore pressure will be redistributed and groundwater will inflow into tunnels through some fractures and faults in soil or rock respectively. The pore water pressure exerted at a boundary surface of tunnel consider as a hydrostatic stress. Due to pore water pressure, produces stresses and displacement surrounding the tunnel. The stress and displacement is depend on properties of soil or rock which can be isotropic and non-isotropic. This paper gives understanding of stability of rock tunnel in isotropic and non-isotropic boundary conditions by reviewing previous research papers.

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