| Annotation |
The distribution of stresses and deformations around the tunnel, when its cross-sectional shape is trapezoidal with developed vertical walls, and is located in the zone of intermountain depression influence, are established by the method of Kolosov – Muskhelishvili, taking into account the developed methodology and using the MATNCAD software environment. It is noted that the massifs of intermountain depressions experience the action of volumetric forces and tectonic compression, and the hydrostatic head acts on the contour of the tunnel.
To determine the stress fields, a model of the initial stressed state of arrays with a mountain relief is constructed. The model is represented as a sum of four fields. The first stress field is an integral of differential equilibrium equations under the joint action of gravity force, quasi-static seismic force and horizontal tectonic forces. The second field characterizes the influence of two closely located mountains with a depression between them. The third field characterizes the emergence of a tunnel in a prestressed array from the first two fields. The fourth field arises from the pressure of water on the tunnel contour. The results of calculation of tension and deformations fields, with and without taking into account the existence of the tunnel are given.
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| References |
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