Concrete dam damage dynamic early warning method considering influence of service environment
A technology for concrete dams and service environments, applied in alarms, instruments, etc., can solve problems such as difficulty in building and evaluating dam damage dynamic early warning models, limited impact on service safety of concrete dams, and endangering dam safety, etc.
Inactive Publication Date: 2018-12-18
HOHAI UNIV
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Problems solved by technology
However, damage to small or non-critical parts has limited impact on the service safety of concrete dams. The extent to which the damage reflected by changes in diagnostic indicators may seriously endanger dam safety is the core issue that needs to be answered in dam damage early warning.
The measuring points and data of dam dynamic monitoring are generally few, so it is difficult to construct and evaluate the dam damage dynamic early warning model based on traditional methods, and it is necessary to improve and innovate the traditional methods to build a truly practical Dynamic early warning method of concrete dam damage
Method used
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Embodiment
[0049] Embodiment: A concrete dam damage dynamic early warning method considering the influence of the service environment described in the present invention, taking 36 records of the accelerometer of a concrete dam 19# dam section as an example for analysis, and using the SSI-DATA method to identify the modal frequency , and determine the real modal frequency according to the steady state diagram, and the frequency results identified by the SSI-DATA method are shown in Table 1.
[0050] Table 1 Frequency identification results of SSI-DATA method
[0051]
[0052] by process line image 3 , Figure 4 It can be seen that the natural vibration frequency of the dam is mainly affected by the change of water level. When the water level decreases, the natural vibration frequency generally increases; at the same time, the influence of air temperature on the natural vibration frequency cannot be ignored.
[0053] Based on the nonlinear dynamic system characteristics of concrete g...
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The invention discloses a concrete dam damage dynamic early warning method considering the influence of service environment. The concrete dam damage dynamic early warning method comprises the following steps that on the basis of identifying various modal parameters of a concrete dam under different service environments, a relationship model between environmental quantity and the modal parameters is fit and constructed; and a cusp catastrophe model for dam damage dynamic early warning is established, and a safety degree index representing dam damage degree is drawn up by using a grey theory andis taken as a basis for real-time safety diagnosis of concrete dams. According to the concrete dam damage dynamic early warning method, the influence of service environment change on the dam modal parameter identification value is eliminated, and a concrete dam damage warning threshold value and the safety degree index representing the dam damage degree are determined with fewer dam dynamic monitoring measuring points and data; the sudden change of the damage state of the concrete dam can be well reflected, and the safety state of the concrete dam is effectively evaluated; and when the situations of the poorer continuity and lower integrity of static monitoring data of the concrete dam occur, a new reference can be provided for dam state evaluation.
Description
technical field [0001] The invention relates to a water engineering health monitoring method, in particular to a concrete dam damage dynamic early warning method considering the influence of service environment. Background technique [0002] The number, scale and technical difficulty of dams built in my country are all in the forefront of the world. In recent years, due to the needs of social and economic development, the water conservancy development of Dadu River, Lancang River, Jinsha River and other rivers in Southwest China has been promoted. my country's dam construction has entered another peak. Since most projects are located in mountainous areas and the geological conditions are complex, once an accident occurs, it will have a very significant impact on the society, economy and environment. Ensuring the safety of the dam is the top priority in the design, construction and operation of the dam. It is an important research direction that scholars in engineering relate...
Claims
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Inventor 苏怀智付浩雁方正杨孟
Owner HOHAI UNIV