CN-122020950-A - River barrage optimization method and system based on earthquake-resistant simulation

CN122020950ACN 122020950 ACN122020950 ACN 122020950ACN-122020950-A

Abstract

The invention provides a method and a system for optimizing a river barrage based on earthquake-proof simulation, which comprise the steps of obtaining design parameters, geological conditions and actual operation conditions of the river barrage, drawing up various calculation conditions including earthquake load action combination, carrying out structural stress and deformation calculation on the river barrage under each calculation condition to obtain a quasi-static force method stress deformation result, identifying a target evaluation area based on the quasi-static force method stress deformation result, carrying out dynamic time course analysis on a dam body and a dam foundation system according to the design parameters and the geological conditions to obtain an earthquake dynamic response result, fusing the quasi-static force method stress deformation result and the earthquake dynamic response result, carrying out comprehensive safety evaluation on the earthquake stability and structural strength of the river barrage, and providing a processing scheme for the river barrage structure which does not meet the preset earthquake-proof safety standard according to the comprehensive safety evaluation result to realize comprehensive, reliable and refined evaluation on the earthquake-proof performance of the river barrage.

Inventors

ZHAO JINGANG
CAI WENWEI
WANG JUNJIE
YAO WUSONG
JIANG SONGBO

Assignees

华能新疆能源开发有限公司托什干河水电分公司

Dates

Publication Date: 20260512
Application Date: 20251203

Claims (10)

1. A method for optimizing a barrage based on earthquake-resistant simulation is characterized by comprising the following steps: acquiring design parameters, geological conditions and actual operation conditions of the barrage dam, and drawing up various calculation conditions including earthquake load action combinations; adopting a quasi-static method to calculate structural stress and deformation of the barrage under each calculation working condition, and obtaining a quasi-static method stress deformation result; identifying a target evaluation area based on the pseudo-static force method stress deformation result, and performing dynamic time course analysis on the dam body and the dam foundation system according to the design parameters and geological conditions aiming at the target evaluation area to obtain a seismic dynamic response result; The pseudo-static force method stress deformation result and the earthquake dynamic response result are fused, the earthquake resistance stability and the structural strength of the barrage are comprehensively and safely evaluated, and a comprehensive safety evaluation result is obtained; And according to the comprehensive safety evaluation result, providing a treatment scheme for the barrage structure which does not meet the preset anti-seismic safety standard.
2. The method for optimizing a barrage based on anti-seismic simulation according to claim 1, wherein the step of calculating structural stress and deformation of the barrage under each calculation condition by using a quasi-static force method to obtain a quasi-static force method stress deformation result comprises the following steps: simplifying the earthquake action into an equivalent static force in the horizontal direction and applying the equivalent static force to the gravity center of the structure; based on the equivalent static force and other loads in the calculation working conditions, establishing a whole model of the barrage in general finite element software to perform static force calculation; and extracting and outputting the calculated stress and displacement distribution data of the integral model as the pseudo-static force method stress deformation result.
3. The method for optimizing a barrage based on anti-seismic simulation according to claim 2, wherein the step of identifying a target evaluation area based on the pseudo-static method stress deformation result, and performing dynamic time course analysis of a dam body and a dam foundation system according to design parameters and geological conditions for the target evaluation area to obtain a seismic dynamic response result comprises the steps of: analyzing stress and displacement distribution data in the pseudo-static force method stress deformation result to identify a part with stress higher than a preset stress threshold value or displacement greater than a preset displacement threshold value as a target evaluation area; Aiming at a target evaluation area, combining the design parameters and geological conditions, and establishing a three-dimensional finite element model comprising the area, a dam body with a preset peripheral range and a foundation; inputting seismic waves matched with site conditions into the three-dimensional finite element model, and performing dynamic time-course analysis; and recording dynamic response data of the target evaluation area in the whole earthquake process as the earthquake dynamic response result.
4. The method for optimizing a barrage based on earthquake-proof simulation of claim 3, wherein the step of fusing the pseudo-static force method stress deformation result and the earthquake dynamic response result to perform comprehensive safety evaluation on the earthquake-proof stability and the structural strength of the barrage and obtain a comprehensive safety evaluation result comprises the following steps: Comparing and analyzing the maximum stress and displacement in the earthquake dynamic response result with the stress and displacement at the corresponding position in the pseudo static force method stress deformation result to obtain a comparison analysis result; based on the comparison analysis result, evaluating the possibility of cracking, slipping or resonating risks of the structure under the action of power, and taking the possibility as an evaluation result; And integrating the evaluation result and a safety threshold value, and making safety judgment on the barrage to form the integrated safety evaluation result.
5. The method for optimizing a barrage based on earthquake-resistant simulation according to claim 1, wherein the step of providing a processing scheme for the barrage structure which does not meet the preset earthquake-resistant safety standard according to the comprehensive safety evaluation result comprises the following steps: Analyzing the comprehensive safety evaluation result, and determining specific structural parts which do not meet the anti-seismic safety standard and failure modes of the specific structural parts; Generating a targeted treatment scheme based on the determined failure mode, wherein the treatment scheme comprises the steps of carrying out structural reinforcement on the insufficient strength part, carrying out foundation reinforcement on the insufficient stability area or adding anti-seismic construction measures on the part with excessive power response; And feeding the processing scheme back to the design model to form an optimized design scheme.
6. A method of optimizing a barrage based on seismic modeling as defined in claim 3 wherein said inputting seismic waves to said three-dimensional finite element model that match site conditions for dynamic time-course analysis comprises: selecting a plurality of natural waves or artificial waves matched with the site category and the designed seismic grouping from a seismic wave library; Amplitude modulation is carried out on the selected seismic waves, so that the acceleration peak value is consistent with the designed seismic vibration parameters; and respectively inputting the amplitude-modulated plurality of seismic waves into the model for time-course analysis, and taking the average value or the envelope value of each response result as the final result of the dynamic response data.
7. The method for optimizing a barrage based on anti-seismic modeling of claim 1, further comprising, prior to performing the dynamic time course analysis: Acquiring the thickness of a covering layer and a soil layer liquefaction discrimination result in the geological condition; if the thickness of the covering layer exceeds a standard specified threshold or a liquefiable soil layer exists, performing the dynamic time course analysis on the identified target evaluation area; otherwise, directly carrying out the comprehensive safety evaluation based on the pseudo-static force method stress deformation result.
8. The method for optimizing a barrage based on earthquake resistant simulation of claim 4, wherein comparing the maximum stress and displacement in the earthquake dynamic response result with the stress and displacement at the corresponding position in the pseudo-static force method stress deformation result to obtain a comparison analysis result comprises: Respectively establishing quantitative comparison relations between the maximum dynamic stress and the maximum dynamic displacement obtained in a dynamic time interval analysis method and the corresponding static stress and the corresponding static displacement obtained in a quasi-static method aiming at the same target evaluation area; Calculating the ratio and the difference of the dynamic stress and the static stress, and the ratio and the difference of the dynamic displacement and the static displacement respectively according to the quantitative comparison relation; Based on the ratio and the difference obtained by calculation, the consistency degree and the difference of the dynamic time-course analysis method and the quasi-static method on the stress and the displacement of the predicted target evaluation area are evaluated, and whether the target evaluation area has a dynamic amplification effect is judged, so that a comparison analysis result is formed.
9. The method for optimizing a barrage based on earthquake resistant simulation of claim 8, wherein the determining whether the power amplification effect exists in the target evaluation area comprises: Defining the ratio of the dynamic stress to the static stress and the ratio of the dynamic displacement to the static displacement obtained by calculation as a power amplification coefficient; comparing the power amplification coefficient obtained by calculation of each target evaluation area with a preset reference amplification coefficient threshold value; and when the power amplification factor of the target evaluation area is continuous and is larger than the reference amplification factor threshold value, judging that the power amplification effect exists at the part.
10. A system for optimizing a barrage based on seismic modeling, comprising: The working condition module is used for acquiring design parameters, geological conditions and actual operation conditions of the river-blocking dam, and drawing up various calculation working conditions including earthquake load action combinations; The static force module is used for calculating structural stress and deformation of the barrage under each calculation working condition by adopting a quasi-static force method to obtain a quasi-static force method stress deformation result; the response module is used for identifying a target evaluation area based on the pseudo-static force method stress deformation result, and carrying out dynamic time course analysis on the dam body and the dam foundation system according to the design parameters and the geological conditions aiming at the target evaluation area to obtain a seismic dynamic response result; the evaluation module is used for fusing the pseudo-static force method stress deformation result and the earthquake dynamic response result, comprehensively evaluating the earthquake resistance stability and the structural strength of the barrage, and obtaining a comprehensive safety evaluation result; and the processing module is used for providing a processing scheme for the barrage structure which does not meet the preset anti-seismic safety standard according to the comprehensive safety evaluation result.

Description

River barrage optimization method and system based on earthquake-resistant simulation Technical Field The invention relates to the technical field of water conservancy and hydropower engineering, in particular to a method and a system for optimizing a barrage based on earthquake-resistant simulation. Background In the hydraulic and hydroelectric engineering, the river blocking dam is an important water blocking and regulating building, and the structural safety of the river blocking dam not only relates to the normal operation of a power station, but also directly influences the flood control safety of a downstream area. Some hydropower stations are located in areas where earthquake activities are frequent, and the earthquake action becomes one of key factors affecting the long-term safe service of hydraulic buildings. In order to ensure engineering anti-seismic safety, the current design specifications generally require anti-seismic analysis and check on hydraulic buildings. At present, a simplified method is often adopted in engineering practice to evaluate stress and deformation of a structure under the action of an earthquake. However, such methods are generally based on static or quasi-static assumptions, and it is difficult to fully reflect the dynamic characteristics of the seismic vibrations and their interactions with the structure-based system, and especially in projects where the geological conditions are complex or the structural form is special, there may be problems with under-estimation of the response to the target evaluation area. Disclosure of Invention The invention provides a method and a system for optimizing a barrage based on earthquake-resistant simulation, which are used for solving the technical problems of insufficient earthquake-resistant evaluation precision and weak targeting in the prior art. In one aspect, the invention provides a method for optimizing a barrage based on earthquake-resistant simulation, comprising the following steps: acquiring design parameters, geological conditions and actual operation conditions of the barrage dam, and drawing up various calculation conditions including earthquake load action combinations; adopting a quasi-static method to calculate structural stress and deformation of the barrage under each calculation working condition, and obtaining a quasi-static method stress deformation result; identifying a target evaluation area based on the pseudo-static force method stress deformation result, and performing dynamic time course analysis on the dam body and the dam foundation system according to the design parameters and geological conditions aiming at the target evaluation area to obtain a seismic dynamic response result; The pseudo-static force method stress deformation result and the earthquake dynamic response result are fused, the earthquake resistance stability and the structural strength of the barrage are comprehensively and safely evaluated, and a comprehensive safety evaluation result is obtained; And according to the comprehensive safety evaluation result, providing a treatment scheme for the barrage structure which does not meet the preset anti-seismic safety standard. On the other hand, the invention also provides a system for optimizing the barrage based on earthquake-resistant simulation, which comprises the following steps: The working condition module is used for acquiring design parameters, geological conditions and actual operation conditions of the river-blocking dam, and drawing up various calculation working conditions including earthquake load action combinations; The static force module is used for calculating structural stress and deformation of the barrage under each calculation working condition by adopting a quasi-static force method to obtain a quasi-static force method stress deformation result; The response module is used for identifying a target evaluation area based on the quasi-static force method stress deformation result, and carrying out dynamic time course analysis on the dam body and the dam foundation system according to the design parameters and the geological conditions aiming at the target evaluation area to obtain a seismic dynamic response result; the evaluation module is used for fusing the pseudo-static force method stress deformation result and the earthquake dynamic response result, comprehensively evaluating the earthquake resistance stability and the structural strength of the barrage, and obtaining a comprehensive safety evaluation result; and the processing module is used for providing a processing scheme for the barrage structure which does not meet the preset anti-seismic safety standard according to the comprehensive safety evaluation result. The method and the system for optimizing the sluice dam based on the earthquake-resistant simulation can be used for efficiently completing preliminary safety evaluation of the whole dam range by using a quasi-static method to identify potential weak par