Issue: 4(35), 2014. Series: Multi-Topic

INFLUENCE OF THE SECTION SHAPE OF DERIVATIONAL TUNNEL THAT IS UNDER THE INFLUENCE OF GRAVITATION FORCES ON TENSION DISTRIBUTION ACROSS ITS CONTOUR

UDK: 622.261.2:539.4

Bogomolov A. N.

Results of comparison of numerical values of the tangential normal tension arising in points of contours of underground developments of various cross section under the influence of gravitation forces are given. It is established that contours of developments of astroid and deltoid section are almost free from this tension, and for a deltoid contour the low level of tension σ_θ is observed at the size of lateral pressure coefficient that is different from the one recommended by V. K. Tsvetkov. It is shown that the level of tension σ_θ in points of astroid and deltoid contour 1…3 times less than in points of contours of traditional form. This circumstance allows to use the considered forms of cross section at a driving of temporary developments that will allow to provide short-term stability of the developments without their strengthening by timber setting.

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