Method for determining length of bridge according to shifting bed model

Abstract

The invention belongs to the field of bridge measurement and design, and provides a method for determining the length of a bridge according to a shifting bed model. The method comprises the following steps of: disclosing the determining basis of the reasonable length of the bridge; then providing the initial value of the length formula of the bridge by a shifting bed model formula; finally preferably selecting a reasonable design scheme according to three control conditions, wherein the design scheme comprises the finally determined length of the bridge, the arrangement type of the training wall and the bridge hole hydraulic calculation of a system, and solves the existing formula and the method for calculating the length of the bridge; the problems that for the river reach of a high-gradient gravel-cobble river with the difficulty for distinguishing a swale, the standards for determining the basic river width are not uniform, and the calculation results have great differences are solved; and from the integral relationship that the length of the bridge, dammed water and scouring are interacted and influenced mutually, the souring depth of the section of the bridge site, the height of the dammed water and the souring depth of a training wall act as the control indexes, the mutually balanced reasonable length of the bridge is determined so as to meet the flood discharge smoothness, the sand conveying balance and regulating structure protection act as the determining criteria, and the long-term economic benefit of the engineering is developed effectively.

Description

technical field [0001] The invention belongs to the field of bridge design, in particular to a method for determining bridge length according to a moving bed model. Background technique [0002] Most of the inland rivers are lost in the basin irrigation area or the hinterland of the desert, and a few accumulate water in the low-lying parts to form lakes. The regional topography and climate characteristics determine that the sloped plains in front of the mountains (systems) are widely distributed with large pitched gravel rivers. [0003] The main characteristics of the river section of the large pitched pebble river are wide and shallow riverbed, low bank sills, messy beaches and channels, uncertain flow direction and changing water flow. The width of the river bed can range from hundreds of meters to several kilometers. The width of the flood flood is smaller than the actual river width. There is a surplus width in the river bed. Therefore, building bridges on changing riv...

AI Technical Summary

Problems solved by technology

[0007] The present invention provides a method for determining the bridge length according to the moving bed model, aiming at solving the formula and method for calculating the bridge length provided by the prior art. The wide standard is not uniform, and the calculation results are quite different

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