Crack Classification Method for Concrete Dam

Abstract

The invention relates to a method for classifying concrete dam cracks, and belongs to the technical field of concrete dam engineering. The method for classifying the concrete dam cracks comprises the following steps that 1, influence features are selected according to the characters of the cracks; 2, evaluation standards are set for the selected influence features respectively; 3, influence weights are assigned to the selected influence features respectively; 4, through actual measurement, specific parameters of the selected influence features are acquired; 5, the general score V of the cracks is calculated; 6, normalization processing is carried out on the value of the general score V through min-max standardization, a result mapping value F is obtained and ranges from 0 to 1, the cracks are classified according to four kinds of cracks regulated by the nation, and particularly, if F<0.5, the cracks are in a class A, if 0.5<=F<0.65, the cracks are in a class B, if 0.65<=F<0.85, the cracks are in a class C, and if F>=0.85, the cracks are in a class D. The method for classifying the concrete dam cracks is more scientific and accurate in classification.

Description

technical field [0001] The invention relates to a concrete dam crack classification method, which belongs to the technical field of concrete dam engineering. Background technique [0002] Various cracks may appear during the construction and operation of concrete dams. It is necessary to classify the cracks first, and then take corresponding treatment methods for different types of cracks. Crack classification is an important basis for determining crack treatment measures. [0003] Concrete crack classification, the current relevant specification is "Technical Regulations for Defect Detection and Evaluation of Hydraulic Concrete Buildings" DL / T5251-2010, Article 5.2.2 stipulates that hydraulic concrete cracks are classified according to crack width and crack depth, when the crack width When the fracture depth and fracture depth do not conform to the impact characteristics in the table, they should be classified according to the principle of closeness and strictness. [0004...

AI Technical Summary

Problems solved by technology

This standard only selects the fracture width and depth, and the influence features are too few to fully reflect the scale of the fracture; there are many properties and characteristics that reflect the scale of the fracture, and some features are as important as the width and depth of the fracture, such as fracture location, fracture length

[0011] (2) The classification process is more random

[0012] (3) The classification result is unreasonable

Taking the common surface temperature cracks as an example, under the influence of external periodic temperature changes, the surface crack width exceeds 0.5mm, and the crack depth does not exceed 3m. According to the above classification method, it is a type D crack, but it is basically considered a type B crack in engineering. , the classification result does not match the engineering understanding