It is proposed to construct a $1$m diameter tunnel beneath a road next to which sits a four storey Victorian brick building which is built on $1$m wide shallow foundations $1$m deep. The load on the foundations is $200$kN$/$m which are $30$m long parallel to the road. The axis of the tunnel is $2$m below the ground surface and $2$m from the edge of the foundations. Calculate the maximum pressure acting on the crown of the tunnel. During tunnel construction, diagonal cracks were noticed in the Victorian building. The owners of the buildings were concerned so all work on the tunnel stopped. Explain why the building could have cracked and put forward a proposal to prevent further movement of the building yet still the tunnel to be completed using the information in Table B$17-1.$ Calculations are not necessary.