Method for drawing up center line of arch dam

Abstract

The invention discloses a method for drawing up the center line of an arch dam. Firstly, the initially-drawn-up center line of the arch dam is obtained through a traditional computing method, then theinitially-drawn-up left (right) bank chord length Lsli (Lsri) is obtained through arch rings of different elevations, the function relationship curve of the elevation values of various layers of archrings and the initially-drawn-up left (right) bank chord length Lsli (Lsri) is obtained in a fitting manner through the principle of least squares, and the optimal center line position of the arch dam is obtained by computing the arch dam center offset distance obtained when the left and right bank computing chord length deviation under the elevations of the arch rings tends to be the minimum. According to the method, it is guaranteed that the left banks and the right banks of the arch rings tend to be symmetric, and the repeated and complex manual trial process is avoided.

Description

Technical field [0001] The invention belongs to the technical field of water conservancy and hydropower engineering application, and specifically relates to a method for drawing up the centerline of an arch dam. Background technique [0002] In the design of the arch dam shape, the determination of the center line of the arch dam is of great significance. The conventional design method is to find the lowest point of the rock surface along the dam axis. For example, the bottom of the river valley is flat. The center of the flat part can be used as the arch crown beam. position. The vertical plane connecting the arch crown beam and the center of the top arch is called the arch dam reference plane, and the horizontal projection of the arch dam reference plane is the arch dam centerline. [0003] First of all, this method cannot guarantee that the left and right banks of each layer of arch rings tend to be symmetrical. According to the "Arch Dam Design" (U.S. Bureau of Reclamation), w...

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a drafting method for the centerline of an arch dam, construct a mathematical model based on practical engineering problems, determine the centerline of the arch dam by using the principle of least squares method and a mathematical programming solution method, and ensure the accuracy of each layer of arch rings. The left and right banks tend to be symmetrical, avoiding the stress concentration phenomenon caused by the asymmetry of the arch rings of the left and right banks; at the same time, ensuring the smoothness and convexity of the connection between the arch rings of each layer, avoiding the process of repeated trial calculation and adjustment

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