| The construction of nuclear power plants including site selection,design and construction in our country has been in a rapid development stage in recent years.Based on the introduction,digestion and absorption of AP1000 technology,the "updated version" CAP1400 large-scale advanced pressurized water reactor and high temperature gas cooled reactor with proprietary intellectual property right are in the breakthrough stage As the standardized business nuclear reactor,the new version AP1000 has relatively conservative nuclear island design.Taking into account the AP1000 nuclear power plant construction,the preferred bedrock site may be increasingly scarce.The designed foundation of the nuclear island structure of the new version AP1000 nuclear power plant is broadened from the bed rock plant site to soil layer plant site,and the site parameters of various types of plant sites are determined based on the investigation several nuclear power plants in the United States,including of bed rock site(HR),hard bed rock site(FR)soft rock site(SR),decayed rock site(SMS-UB),solid soil layer site(SMS)and soft soil site(SS).Site conditions have large influence on the spreading of ground motion,that is site conditiors can significantly increase or reduce ground motion.During the application and promotion of the AP1000 and CAP 1400 standard designed nuclear power plant structure,there are scarce bed rock plant sites;in order to enlarge the site selection range,it is inevitably select non bed rock plant sites;the consequent series of problems on site adaptation will inevitably give rise to the research on the applicability of standard designed seismic oscillation parameters in non-rock site nuclear power plant and the determination of non-rock site seismic oscillation parameters of nuclear power plant,to provide theoretical basis for further perfection of earthquake safety evaluation of nuclear power plant engineering and seisnic design safety requirements.The analysis of soil-structural interaction is an important process of structural seismic design and safety analysis of nuclear power plant.As for the foundation soil of non-rock site,due to the foundation soil-structural interaction functions on the foundation surface of structure,there is significant difference with free field movement;therefore;the influence shall be taken into consideration of the design.In order to conduct research on the applicability of CAP 1400 nuclear power plant in non-rock site conditions,this article studies the stress characteristics and reaction rules of the foundation soil-nuclear power plant structural system in seismic load effect through structural shaking table test of non-rock site nuclear power plant.In addition,it conducts comparative analysis numerical simulation technique and test result,it acquires the results with reference values to practical engineering.This article mainly conducts the following detailed works:1.Based on the summarization of shaking table test model soil boxes researched and manufactured by domestic and overseas scholars,it researches and develops the three-dimensional layered shearing model box.It introduces the structural design,installation process and working principle of the model box,and conducts free site shaking table model test,and evaluates and quantifies the boundary simulation effect of the three-dimensional layered shearing model box.2.According to the consistent similar principle and the maximum test load of the designed and permitted shaking table size,this article conducts research on shaking table simulation test of non-rock site nuclear power plant structure,mainly including the determination of the structural model size of nuclear power plant,test similarity ratio design,manufacturing of model soil and nuclear power plant model structure,model material performance test,selection and loading system of seismic oscillation,selection and arrangement of various types of sensors.3.It conducts shaking table model test on seismic response of structural soil-structural interaction function under different earthquake magnitudes and strengths.According to the analysis on the test data,it summarizes the seismic response rules of coupled systems of nuclear power plant structure on different orientations.It mainly analyzes the acceleration response and the strain on model foundation and nuclear power plant structure,and analyzes the interactive power function between model foundation and the nuclear power plant structure,as well as the changes on dynamic earth pressure on the contact surface between them.4.It analyzes the three-dimensional seismic response characteristics of the coupled system of the non-rock site nuclear power plant structure under different seismic oscillation characteristic inputs.In the condition of the seismic input with consistent model site and model structure but different characteristics,it conducts dynamic response analysis on the coupled system,to acquire the structural response accelerated speed time interval,and then acquires the accelerating response spectrum through Fourier conversion,to conduct research on their characteristics as well as the relationship with the inputted seismic oscillation parameters and structural characteristics,to provide basis and reference foundation for related researches and seismic design for non-rock site nuclear power plant.5.The numerical simulation of ground motion response of a nuclear power plant structure coupling system in non-rock site is carried out.The large-scale finite element software ABAQUS is adopted to conduct modeling to CAP1400 nuclear power plant structure,to analyze the site and structural dynamic characteristics in non-rock site conditions.The artificial seismic oscillation of the API1000 design response spectrum is taken as the input seismic oscillation of seismic response analysis,to conduct time-procedure analysis.It verifies that under the action of safety shut-down earthquake(SSE),as well as the site applicability and the structural seismic design safety of the non-rock site nuclear power plant. |
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