Diagnostic method of evolution state of damage field of concrete dam

A technology of concrete dam and diagnosis method, which is applied in the testing of machine/structural components, measuring devices, instruments, etc., can solve the lack of correlation analysis of the changes of measured values ​​of multiple measuring points, and it is difficult to comprehensively reflect the health status of dams, etc. question

CN103162982BActive Publication Date: 2015-06-24HOHAI UNIV +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2015-06-24

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Abstract

The invention discloses a diagnostic method of an evolution state of a damage field of a concrete dam. The method includes the steps of (1) building a damage field indication variable based on entropy, and defining the entropy of a system as H=F(Q,qi,L,T); (2) calculating the damage field indication variable, and extracting sizes influenced by stress, strain and strainmeter of the damage field from a dam safety monitoring system, wherein the number of strainmeter groups is n, strain energy of a unit of a portion where an ith strainmeter group is located is qi (i=1,2,......,n), total strain energy Q of the area is obtained, and therefore an information entropy function H of a local area is (qi=0, lambada i ln lambada i= 0); and (3) expressing the entropy of the damage field of the concrete dam at a certain moment as F(H)=F(Hh)+F(HT)+F(Htheta) according to a time sequence of the damage field indication variable, and obtaining influence degrees of water pressure, temperature and aging for the damage field and changing trends of the damage field according to an entropy formula to achieve diagnosis and prediction for the damage field. The diagnostic method solves the problems that a traditional method can only diagnose a single measurement point and is lack of relevant diagnosis for changes of measured values of multiple measure points, and comprehensively reflects health states of the dam.
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Description

technical field

[0001] The invention relates to a diagnosis method for the evolution state of the damage field of a concrete dam, in particular to a method for diagnosing the evolution state of the damage field of a concrete dam based on the correlation analysis of the change of measured values ​​of a plurality of measuring points. Background technique

[0002] Due to the heterogeneity of concrete materials and the complexity of the environment in which the dam is located, most concrete dams are damaged to varying degrees. The development and evolution of the dam damage field affects the mechanical properties and stress-strain response of the dam body. Therefore, the analysis and diagnosis of the evolution state of the dam damage field has long been a hot topic and a difficult problem in the dam industry.

[0003] At present, the analysis and diagnosis of dam damage based on dam monitoring data is mainly to analyze the effect size at a single measuring point, which can only...

Examples

Embodiment

[0035] Embodiment: A method for diagnosing the evolution state of the damage field of a concrete dam disclosed by the present invention, the schematic diagram of its realization process is as follows figure 2 As shown, proceed as follows:

[0036] (1) Constructing an entropy-based damage field indicator variable

[0037] The interaction process between the concrete dam system and the external environment is accompanied by material flow and energy flow. The damage field of the dam varies with time and space, and the entropy of the system is defined as: H=F(Q,qi ,L,T), where Q is the total strain energy of the damage field of the dam body; q i is the strain energy of each measuring point in the system; L is the position of the measuring point; T is the monitoring time;

[0038] The damage and failure of concrete dams is the comprehensive result of energy dissipation and energy release. From the perspective of energy, considering the changes of the stress field and the displa...