STABILITY OF THE TUNNEL PASSING NEAR THE SLOPE TAKING INTO ACCOUNT THE GROUTING ZONE

ანოტაცია

Diversion tunnels of high head pressure hydropower plants usually pass near the gorge, which worsens the operating conditions of the "tunnel-massive" system, especially when seepage through the tunnel develops. When designing, it is necessary to determine the route of the tunnel with minimal depth and distance from the gorge surface. Solving this problem using classical solutions encounters well-known difficulties. In this regard, numerical methods have a great advantage. By analyzing the numerical results of alternative solutions, it is possible to achieve an acceptable location of the tunnel axis that provides safety conditions.

When solving assigned problems using finite element method (FEM), difficulties arise, mainly related to the development of calculation schemes for variant problems. In this regard, the boundary element method (BEM) has a great advantage. With a change in the location of the center of the tunnel, the design versions of the “tunnel-massive” system are rebuilt while maintaining the boundary element approximation of the edge contour.

The article provides some results of a numerical assessment of the stability of a slope in the presence of a tunnel, taking into account seepage through the lining.