ON STRESSES AROUND A TUNNEL PASSING THROUGH TWO ROCK LAYERS

The article deals with the issue of determining the stresses around a circular tunnel. It passes through two rock layers. Each of them has an arbitrarily located plane of isotropy. The boundary plane between them is inclined to the axis of the tunnel. Furthermore, the plane is parallel to the horizontal axis of the circular cross-section of the tunnel. The specified class of tasks is solved with the complex potential theory and an approach from the mechanics of layered media. The expressions for the stresses in the two layers have been derived. The results are applied to a real rock mass consisting of two transversely isotropic layers. The stresses at points of the circular section of the tunnel in the two layers were obtained. Two tangential normal stress diagrams are given.