Measuring and controlling method of maximal scouring depth of bridge abutment

Abstract

The invention belongs to the field of bridge measurement and design, and provides a measuring and controlling method of the maximal scouring depth of a bridge abutment. The method comprises the following steps of: firstly designing a bridge abutment scouring experiment scheme, and then analyzing the shifting bed experiment result, wherein aiming at that during the specific flood process, the bridge abutment scouring depth has great relationship with the maximal unit discharge of the flood peak at the bridge site, the river bed gradient as well as the particle size composition of the river bed, the bridge abutment is in the increase trend as the unit discharge and the river bed gradient, and is in decrease trend as the river bed particle size. The partial scouring depth around the bridge abutment by adopting the multi-parameter correlation analysis is subjected to formula fitting, thereby obtaining the fitting formula of the bridge abutment scouring depth. The obtained fitting formula is high in pertinence and suitable for the built bridge culvert of a high-gradient gravel-cobble river reach, the relevant coefficient of the fitting formula is high, and the problems that the existing formula for calculating the partial scouring depth of the bridge abutment is not suitable for the high-gradient gravel-cobble river reach and is unreasonable in calculation are solved.

Description

technical field [0001] The invention belongs to the field of bridge design, in particular to a method for measuring and controlling the maximum scouring depth of bridge pier abutments. Background technique [0002] After the bridge is built, due to the obstruction of the water flow by the bridge pier, it will cause drastic changes in the water flow structure around the pier, forming a descending water flow at its front, vertically downward, violently scouring the bed surface sediment, and forming a funnel-shaped scour in front of the pier Pit, called local scour. As the scouring continues, the fine-grained sediment is taken away, and the coarse-grained silt is left behind. The river bed is gradually coarsened, and eventually a new state of erosion-silting balance will be reached. The depth is called the local scour depth. The depth and size of local scour pits are related to many factors. In addition to the approaching velocity of the water flowing towards the bridge pier,...

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Problems solved by technology

[0043] The invention provides a method for measuring and controlling the maximum scouring depth of bridge piers, aiming to solve the problem that the existing method for determining the local scouring depth of bridge piers is not suitable for river sections of large-scale gravel rivers

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