In a granite rock with $E=5{10}^4$MPa,$v=0\mathrm{.}25,$ and $=0\mathrm{.}027M\frac{N}{m^3}.$

Calculate the deflection and stresses around the circular tunnel at the wall and roof with a radius of $=6m.$ The tunnel is to be excavated in elastic rocks at a depth $=500m$ and $k=0\mathrm{.}3$