Stanovení součinitele relaxace beta- metody pro modelování tunelů

Abstract

The thesis discusses about a relaxation coefficient (β-coefficient) which come out from load reduction method (known as a β-method) for a deformation feedback spatial systems „support-rock“ on the basis of 2D plane-strain model. The thesis is especially focused on an evaluation of longitudinal displacement profile of ceiling in the tunnel. In this paper work are described problems of deformation during excavation underground structures, creation of mathematical models, reduction a 3D effect on a model of 2D model and of course, specification of a relaxation coefficient, about which this thesis discusses. Relation between a size of vertical displacement ceiling in a different distance from face and size of relaxation coefficient is expressed both for structure without support, and for structure with support up to face or structure with support up to certain distance from face. Consequent relations of a relaxation coefficient are always expressed through the regression function, by which is enable easy conversion of vertical displacement ceiling in tunnel.