METHOD FOR DISPLAYING PROPERTY OF TUNNEL-BORING NATURAL GROUND

PROBLEM TO BE SOLVED: To make the carrying-in and assembling preparations of timbers suitable for each type of natural ground before tunnel-boring natural ground reaches a timber assembling position as a tunnel boring machine advances by successively detecting the properties of the natural ground at the face excavated as the machine advances and, at the same time, to assemble the timbers on the excavated wall surface having the properties. SOLUTION: The property of the natural ground at a face excavated as a tunnel boring machine advances and the excavated distance are displayed on a monitor screen 17 as a coordinate point X and, at the same time, the model drawing B of the tunnel boring machine showing a cutter side is displayed in one end section of the monitor screen 17 corresponding to the face surface. When the coordinate point S of the properties of the natural ground To at a face when the natural ground To is newly excavated and the excavating distance of the boring machine is displayed on the screen 17, the currently displayed coordinate point A is scrolled to the other end side of the model drawing B and, until the coordinate point X reaches a timber assembling position in the drawing B, timbers having the strength displayed correspondingly to the coordinate point X are prepared and assembled when point X reaches the timer assembling position.