STUDY ON TUNNEL FACE STABILIZATION BY X-RAY RADIOGRAPHY METHOD: APPROACH BY THREE DIMENSIONAL STRAIN ANALYSIS

The two-dimensional laboratory tests have been studied and have obtained the useful data to design the tunnel construction methods. This paper introduce the both two and three dimensional laboratory tests by using X-ray Radiography method under the condition of small strain and tunnel face supporting pressure control tests. From the experiments, the supporting pressure required to maintain the tunnel face is approx. 20% compare with the value which is obtained Terzaghi theory. And, the supporting pressure of both the bench and the cross section heading model is approx. half value of full section model. X-ray radiography method is useful to clear the behavior around the tunnel face.