CN-121997404-A - Method, system, equipment and medium for monitoring and early warning of earthquake safety of dam and evaluating earthquake damage

CN121997404ACN 121997404 ACN121997404 ACN 121997404ACN-121997404-A

Abstract

The invention discloses a dam earthquake safety monitoring and early warning and earthquake damage assessment method, a system, equipment and a medium, which belong to the technical field of dam safety monitoring and comprise the steps of adopting a time domain time-varying mode identification method to process vibration observation data in real time, extracting time-varying mode parameters of a dam and storing the time-varying mode parameters into a time-varying mode library, assessing the safety state of a dam structure according to the time-varying mode parameters, extracting earthquake source information according to earthquake early warning information, predicting earthquake vibration characteristic parameters, judging whether the earthquake source information is in a strong earthquake simulation library, directly calling a corresponding dam earthquake response simulation result when the earthquake source information is in the library, determining optimal input earthquake vibration through similarity matching when the earthquake source information is not in the library, calling the corresponding simulation result to serve as early warning information, extracting earthquake vibration time course characteristics according to dam foundation actual measurement earthquake vibration data, and carrying out earthquake damage rapid assessment by combining the time-varying mode parameters and an earthquake vulnerability function. The method realizes real-time monitoring of the structural state of the dam, rapid early warning of earthquake disasters and rapid evaluation after earthquake.

Inventors

HUANG TIANXUAN
Su Lingqi
LIN JIANCHENG

Assignees

福建华电福瑞能源发展有限公司安砂水力发电厂

Dates

Publication Date: 20260508
Application Date: 20251128

Claims (10)

1. A method for monitoring, early warning and evaluating earthquake damage of dam earthquake safety is characterized by comprising the following steps, Obtaining vibration observation data of a strong-vibration observation array of the dam; processing the vibration observation data in real time by adopting a time-domain time-varying mode identification method, extracting time-varying mode parameters of the dam and storing the time-varying mode parameters into a time-varying mode library; Evaluating the safety state of the dam structure according to the time-varying modal parameters of the dam; Extracting seismic source information according to received seismic early warning information, predicting seismic vibration characteristic parameters of a target area based on the seismic source information, judging whether the seismic source information is in a preset strong vibration simulation library, directly calling corresponding dam seismic response simulation results in the strong vibration simulation library and the finite element simulation library to serve as seismic disaster early warning information when the seismic source information is in the strong vibration simulation library, performing similarity matching on the seismic vibration characteristic parameters and the existing seismic vibration characteristics in the strong vibration simulation library when the seismic source information is not in the strong vibration simulation library, determining optimal input seismic vibration, and calling simulation results corresponding to the optimal input seismic vibration in the finite element simulation library to serve as seismic disaster early warning information; Extracting earthquake motion time course characteristics according to the actually measured earthquake motion data of the dam foundation, and carrying out rapid dam earthquake damage assessment by combining the dam time-varying modal parameters in the time-varying modal library and a preset dam earthquake vulnerability function to obtain an earthquake damage assessment result; And determining an emergency grade according to the earthquake damage evaluation result and generating emergency auxiliary decision information.
2. The method for monitoring, early warning and evaluating earthquake damage of dam earthquake safety according to claim 1, wherein the step of processing the vibration observation data in real time by adopting a time domain time varying mode identification method, and the step of extracting time varying mode parameters of the dam and storing the time varying mode parameters in a time varying mode library comprises the following steps: preprocessing the vibration observation data; dividing the preprocessed vibration observation data into a plurality of time windows; Carrying out time domain modal identification on the data in each time window, and extracting the time-varying modal parameters of the dam; and storing the time-varying modal parameters of the dam into the time-varying modal library according to time sequence.
3. The method for monitoring, early warning and evaluating earthquake damage of dam earthquake safety according to claim 2, wherein the step of evaluating the safety state of the dam structure according to the time-varying modal parameter of the dam comprises the following steps: extracting dam time-varying modal parameters in a historical time period from the time-varying modal library; calculating the change rate of the current dam time-varying modal parameter relative to the historical time-varying modal parameter; Judging whether the dam structure is damaged according to the change rate, and judging that the dam structure is damaged when the change rate exceeds a preset threshold value.
4. The method for monitoring, early warning and evaluating earthquake damage of dam earthquake safety as set forth in claim 3, wherein predicting earthquake motion characteristic parameters of the target area based on the earthquake source information comprises: analyzing the seismic source information to determine seismic source parameters; Determining a spatial relationship parameter between the seismic source and the dam according to the seismic source parameter and the dam position; acquiring site condition parameters of a target area; And calculating the earthquake motion characteristic parameter by adopting an earthquake motion prediction model based on the earthquake source parameter, the spatial relation parameter and the site condition parameter.
5. The method for monitoring, early warning and evaluating earthquake damages of a dam according to claim 4, wherein the step of matching the earthquake motion characteristic parameter with the earthquake motion characteristics existing in the strong earthquake motion simulation library in a similarity manner comprises the following steps: Extracting earthquake motion characteristic parameters of each earthquake event in the strong vibration simulation library; Normalizing the earthquake motion characteristic parameters and the earthquake motion characteristic parameters of each earthquake event in the strong vibration simulation library; calculating the similarity between the normalized earthquake motion characteristic parameters; and selecting the earthquake motion corresponding to the earthquake event with the largest similarity as the optimal input earthquake motion.
6. The method for monitoring, early warning and evaluating earthquake damage of dam earthquake safety as claimed in claim 5, wherein the step of rapidly evaluating the earthquake damage of the dam comprises the following steps: determining the earthquake motion intensity according to the earthquake motion time course characteristics; Substituting the earthquake intensity into a preset dam earthquake vulnerability function, calculating the overrun probability of the dam reaching each damage level, and combining the dam time-varying modal parameters in the time-varying modal library to obtain a minute-scale earthquake damage evaluation result; And taking the actually measured earthquake motion data of the dam foundation as input, calling a finite element model of the dam to perform dynamic time-course response calculation, and comparing and analyzing the calculated dynamic response result with the dam time-varying modal parameters in the time-varying modal library to obtain an hour-level earthquake motion fine assessment result.
7. The method for monitoring, early warning and evaluating earthquake damage of dam earthquake safety as set forth in claim 6, wherein calculating the earthquake motion characteristic parameter by using an earthquake motion prediction model comprises: Calculating bedrock earthquake motion parameters by adopting an earthquake motion attenuation relation according to the earthquake source parameters and the space relation parameters; determining a field amplification factor according to the field condition parameters; And calculating the ground vibration characteristic parameters of the ground surface of the target area based on the bedrock ground vibration parameters and the field amplification coefficient.
8. A system for monitoring, early warning and evaluating earthquake damage of a dam, which applies the method for monitoring, early warning and evaluating earthquake damage of a dam according to any one of claims 1 to 7, and is characterized by comprising the following steps: the data acquisition module is used for acquiring vibration observation data of the dam strong-vibration observation array; The time-varying mode identification module is used for processing the vibration observation data in real time by adopting a time-domain time-varying mode identification method, extracting time-varying mode parameters of the dam and storing the time-varying mode parameters into a time-varying mode library; The structural safety evaluation module is used for evaluating the structural safety state of the dam according to the time-varying modal parameters of the dam; The earthquake early warning processing module is used for extracting earthquake focus information according to received earthquake early warning information, predicting earthquake vibration characteristic parameters of a target area based on the earthquake focus information, judging whether the earthquake focus information is in a preset strong earthquake simulation library, directly calling corresponding dam earthquake response simulation results in the strong earthquake simulation library and the finite element simulation library to serve as earthquake disaster early warning information when the earthquake focus information is in the strong earthquake simulation library, carrying out similarity matching on the earthquake vibration characteristic parameters and the existing earthquake vibration characteristics in the strong earthquake simulation library when the earthquake focus information is not in the strong earthquake simulation library, determining optimal input earthquake vibration, and calling simulation results corresponding to the optimal input earthquake vibration in the finite element simulation library to serve as earthquake disaster early warning information; the earthquake damage assessment module is used for extracting earthquake motion time course characteristics according to the actually measured earthquake motion data of the dam foundation, and carrying out dam earthquake damage rapid assessment by combining the dam time-varying modal parameters in the time-varying modal library and a preset dam earthquake vulnerability function to obtain an earthquake damage assessment result; And the emergency decision module is used for determining an emergency grade according to the earthquake damage evaluation result and generating emergency auxiliary decision information.
9. A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor, when executing the computer program, implements the steps of a dam seismic safety monitoring and early warning and earthquake damage assessment method according to any one of claims 1 to 7.
10. A computer readable storage medium having stored thereon a computer program, wherein the computer program when executed by a processor implements the steps of a dam seismic safety monitoring and early warning and earthquake damage assessment method according to any one of claims 1 to 7.

Description

Method, system, equipment and medium for monitoring and early warning of earthquake safety of dam and evaluating earthquake damage Technical Field The invention relates to the technical field of dam safety monitoring, in particular to a dam earthquake safety monitoring and early warning and earthquake damage assessment method, system, equipment and medium. Background The dam is used as an important water conservancy infrastructure, and the earthquake safety of the dam is directly related to the life and property safety of downstream people. The existing dam seismic safety monitoring method mainly relies on manual periodic inspection and simple vibration monitoring equipment, and lacks of real-time tracking capability on dynamic characteristic changes of a dam structure. The traditional monitoring method generally records vibration data by using a dam installation acceleration sensor, but only remains as post-earthquake data, and cannot extract dynamic characteristic parameters reflecting the structural state of the dam from the vibration data. When the rigidity of the dam structure changes due to long-term operation or local damage, the traditional method cannot find the change in time, and potential safety hazards exist. In the aspect of earthquake early warning, after receiving earthquake early warning information, the prior art needs to reestablish a dam finite element model and calculate earthquake response, and the process is long in time consumption, so that dam earthquake damage prediction is difficult to complete within the limited early warning time before earthquake. The early warning information cannot be combined with the current actual structural state of the dam, and the prediction accuracy is limited. In the aspect of post-earthquake evaluation, the traditional method mainly depends on expert field investigation and post-event analysis, has long evaluation period, and cannot meet the timeliness requirement of emergency decision. Although part of methods adopt the earthquake vulnerability function for quick evaluation, structural state change in actual operation of the dam cannot be combined, and the evaluation result has deviation from the actual situation. Disclosure of Invention In view of the problems, the invention provides a method, a system, equipment and a medium for monitoring and early warning of earthquake safety of a dam and evaluating earthquake damage. Therefore, the method solves the technical problems of extracting time-varying dynamic characteristic parameters reflecting the structural state from dam vibration observation data in real time, identifying structural damage according to the change trend of the dynamic characteristic parameters, rapidly predicting the earthquake motion characteristics of a target area according to earthquake source information after receiving earthquake early warning information, rapidly acquiring a dam earthquake response prediction result through a pre-established simulation library matching mechanism, and avoiding time consumption of pre-earthquake recalculation. In order to solve the technical problems, the invention provides a method for monitoring and early warning the earthquake safety of a dam and evaluating the earthquake damage, which comprises the following steps, Obtaining vibration observation data of a strong-vibration observation array of the dam; processing the vibration observation data in real time by adopting a time-domain time-varying mode identification method, extracting time-varying mode parameters of the dam and storing the time-varying mode parameters into a time-varying mode library; Evaluating the safety state of the dam structure according to the time-varying modal parameters of the dam; Extracting seismic source information according to received seismic early warning information, predicting seismic vibration characteristic parameters of a target area based on the seismic source information, judging whether the seismic source information is in a preset strong vibration simulation library, directly calling corresponding dam seismic response simulation results in the strong vibration simulation library and the finite element simulation library to serve as seismic disaster early warning information when the seismic source information is in the strong vibration simulation library, performing similarity matching on the seismic vibration characteristic parameters and the existing seismic vibration characteristics in the strong vibration simulation library when the seismic source information is not in the strong vibration simulation library, determining optimal input seismic vibration, and calling simulation results corresponding to the optimal input seismic vibration in the finite element simulation library to serve as seismic disaster early warning information; Extracting earthquake motion time course characteristics according to the actually measured earthquake motion data of the dam foundation, and carrying out rapid dam ea