Measuring and controlling method of scouring depth of training wall of river reach of bridge site

Abstract

The invention belongs to the field of bridge design, and provides a measuring and controlling method of scouring depth of a training wall of a river reach of a bridge site. The method comprises the following steps of: carrying out a stream deviation scouring experiment, a multi-stream scouring shifting bed model experiment and a projection flow rate shifting bed model experiment; and analyzing the experiment results. A hydraulics generalization experiment for the flood peak constant flow process and a typical shifting bed model experiment for flood peak non-constant flow process are adopted to research the training wall scouring depth problem, and the problem that when the scouring depth of the training wall of the river reach of the bridge site is calculated by the existing formula, the scouring depth does not meet the actual situation of a high-gradient gravel-cobble river is solved, so that the scientific and reasonable arrangement of the training river at the river reach of the bridge site is ensured, and the water flow conditions at the bridge site are improved, water and sand are discharged smoothly at the bridge opening, the approach embankment of a bridge and a bridge head is protected, the bridge site is stabilized, and the bridge crossing safety is prevented from being threatened by disadvantageous evolution of the river reach.

Description

technical field [0001] The invention belongs to the field of bridge design, and in particular relates to a method for measuring and controlling scour depth of diversion dikes at bridge positions and river sections. Background technique [0002] According to many years of experience, the regulating structures currently used in large-scale pebble gravel rivers are mainly diversion dikes. Diversion dikes are divided into three plane types: closed dike, curved dike and pear-shaped dike, among which closed dikes are used more. The current specification mainly adopts the following formula suggested by Wang Dirong et al. in the "Specification" (JTJ062-91) (1990) of the Highway Science Research Institute of the Ministry of Communications: [0003] h b = 1.45 ( D t h ) 0.4 ...

AI Technical Summary

Problems solved by technology

The diversion embankment is mainly due to the most severe erosion during the flood receding process, and the magnitude of the flood peak flow has little relationship. Many years of practical experience have also shown this point. The current method is not in line with the actual situation.

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