The Vertical displacements on the crown during excavation is monitored with WRM-3 type extensometer. Successful prediction of extensive coupes in a shallow buried loess tunnel with a large span is made. The emphasis of this paper is put on the interpretation of the whole measuring process at borehole 2. The relations between displacement and excavation of the tunnel

relative displacements in the ground and the surface subsidence are discussed tentatively. The results indicate that monitoring vertical displacements under this engineering condition is very important to ensure the stability and safe excavation of the tunnel. Finally

some conclusions are drawn that the largest vertical displacement during the excavation of top part (about 1/3 height ) of the tunnel occurred when the working surface was in the distance of 1.2 tunnel diameters from the measuring hole and that the change of vertical displacements was small during the excavation of the low part

which was equal to 30—40% of the largest one.