Arch dam shape design method

Abstract

The invention relates to an arch dam shape design method, and belongs to the technical field of arch dam engineering. The method comprises the following steps: firstly, establishing a coordinate system, selecting four control elevation sub-arch rings for shape design for a selected arch dam foundation surface, fitting design parameters of the four control elevation sub-arch rings, then fitting the prepared design parameters of the four control elevation sub-arch rings into a cubic curvilinear equation, calculating to obtain the design parameters of other elevation sub-arch rings, and finally calculating the curvature radius and the central angle of each elevation sub-arch ring to complete the shape design of the arch dam. According to the arch dam shape design method, only 16 parameters need to be determined to describe the shape of the arch dam, so the number of shape adjustment parameters is reduced, and the shape design efficiency is remarkably improved; and the curvature radius and the center angle of a sub-arch ring curve are inversely calculated according to the center coordinates of the arch ends, the positions of the arch ends are not changed in the shape adjustment process, and the shape adjustment is performed on the selected arch dam foundation surface, so that the effectiveness of the arch dam shape design is ensured.

Description

technical field [0001] The invention relates to a method for body shape design of an arch dam, which belongs to the technical field of arch dam engineering. Background technique [0002] Arch dam shape design is the core content of arch dam design. The existing design process is: determine the position of the axis of the arch dam, determine the position of the center line of the arch dam, determine the embedding depth of the arch end, and then design the shape layout. The axis of the arch dam and the center line of the arch dam play the role of the skeleton and positioning control of the arch dam. The design process of the arch dam is to continuously adjust the shape of the arch crown beam, adjust the curvature radius and thickness of the arch rings at each elevation, Until the body design requirements are met. For projects with complex geological conditions, the range of available rock mass for the dam foundation is not large. Once the reasonable foundation surface positio...

AI Technical Summary

Problems solved by technology

For projects with complex geological conditions, the range of available rock mass for the dam foundation is not large. Once the reasonable foundation surface position has been verified and determined, there is little room for adjustment. In the existing arch dam shape design process, the arch dam is changed. The shape of the crown beam, the curvature of the arch ring, the thickness of the arch ring, especially after changing the curvature of the arch ring, the position of the arch end is likely to change, which makes a large difference from the position of the selected foundation surface, resulting in the occurrence of foundation conditions at the arch end. Changes, such a shape design is unacceptable, and it needs to be re-arranged and shaped, resulting in repeated design work and low efficiency

Moreover, in the existing arch dam shape design process, there are many parameters that need to be adjusted during shape design. Taking an arch dam divided into 10 layers and arch rings as an example, the axis of the arch ring adopts a parabolic shape. After the location of the foundation surface of the dam, 3 parameters are required to describe the shape of the upstream surface of the arch crown beam, 4 parameters are required to describe the thickness of the arch crown beam, 20 are the radius of curvature, and 20 are the thickness of the arch end, that is, a total of 47 parameters are required to describe the arch dam Body shape. During the body shape design process, these 47 parameters must be continuously adjusted to make the designed shape meet the relevant requirements. Due to the large number of parameters that need to be adjusted, the adjustment process is complicated, which seriously affects the efficiency of arch dam shape design.

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