Question:
The stresses relative to compass coordinates (x = east, y = north, z = up) are sxx = 2,155, syy = 3,045, szz = 4,200, tyx = -1,222, txz = 0, tyx = 0, in psi 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.