Tunnel lining section drawing-up method based on elliptical focus principle

Abstract

The invention relates to a tunnel lining section planning method based on an elliptical focus principle, and the method comprises the steps: introducing an elliptical auxiliary line to plan the contours of an arch part, a side wall, an arch foot and an inverted arch, enabling the arc transition of each arc segment to be smooth, enabling the curvature of a transition point to be unique, enabling aplurality of arcs to be tangent, and enabling the central angle of each arc segment to be closed. According to the method, the defects of non-cotangent arc transition, non-unique transition point curvature and stress concentration point existing in the structure in the section drawing-up process are overcome, the ellipse-assisted targeted drawing-up method is provided, the tunnel lining section drawing-up precision is improved, and the method is a universal method for tunnel lining section drawing-up.

Description

technical field [0001] The invention relates to the field of tunnel construction design, in particular to a method for formulating tunnel lining sections based on the principle of ellipse focus. Background technique [0002] In the tunnel design process of various industries, multi-center arcs are often used to draw up the inner and outer contours of the tunnel lining. The purpose is to ensure the least excavation, the most reasonable stress and the highest cross-section space utilization efficiency during the service of the tunnel structure. When dealing with the different thicknesses of the secondary lining of the arch foot and the transition section of the inverted arch in the traditional contour line drawing method, designers often use random chamfering methods to deal with it, resulting in non-cotangent arc transitions, non-unique curvature of transition points, and center of each arc section. The problem that the sum of the angles is not closed to 360° will lead to st...

AI Technical Summary

Problems solved by technology

When dealing with the different thicknesses of the secondary lining of the arch foot and the transition section of the inverted arch in the traditional contour line drawing method, designers often use random chamfering methods to deal with it, resulting in non-cotangent arc transitions, non-unique curvature of transition points, and center of each arc section. The problem that the sum of the angles is not closed to 360° will lead to stress concentration points in the structure during the later service of the tunnel, which is not conducive to structural safety

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