The stresses relative to compass coordinates (x = east, y = north, z = up) are xx

Question:

The stresses relative to compass coordinates (x = east, y = north, z = up) are σxx =14.86, σyy = 21.00, σzz =28.97, τyy= −8.43, τxz = 0, τyx = 0 in MPa with compression positive. Suppose a circular tunnel is driven due east by a tunnel boring machine. Estimate the peak compressive and tensile stress concentrations and show locations in a sketch.