| 摘要: |
| 采用基于饱和多孔介质Biot动力固结理论的弹塑性有效应力分析方法,研究了碎石桩加固对某核电厂防波堤震后整体变形以及孔隙水压力发展的影响；以三维碎石桩模型为基准,验证了二维碎石桩等效模型的准确性和适用性。数值模拟结果表明：(1)计算所得震后变形模式与实际震害一致,计算方法为防波堤的抗震评价提供参考；(2)碎石桩加固可以有效减小防波堤的整体变形,在地震前中期,碎石桩刚度起主导作用,在地震中后期,碎石桩渗透系数成为主要影响因素,随着渗透系数的增大防波堤变形减小；(3)分别采用桩墙法与等效面积法将三维的碎石桩群模型等效为了二维平面应变模型,两种等效方法模拟的计算结果均与三维结果较吻合。 |
| 关键词: 防波堤 液化 碎石桩 弹塑性 核电厂 |
| DOI： |
| 分类号:U656.2 |
| 基金项目:国家重点研发计划（2024YFF1702000） |
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| Elastoplastic Numerical Analysis of Reinforcing Nuclear Power Plant Breakwaters with Gravel Piles |
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Zou Degao1, Tang Benjing2, Sun Shoujie1, Liu Jingmao1, Zhang Xiuyang1
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1.School of Infrastructure Engineering,Dalian University of Technology;2.China Nuclear Power Engineering Co,Ltd
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| Abstract: |
| An elastic-plastic effective stress analysis method based on the Biot dynamic consolidation theory for saturated porous media was employed to investigate the effects of gravel piles reinforcement on the overall post-earthquake deformation and pore water pressure development of a nuclear power plant breakwater. Using a three-dimensional gravel pile model as the reference, the accuracy and applicability of the two-dimensional equivalent gravel pile model were verified. Numerical simulation results indicate: (1) The post-earthquake deformation patterns obtained from calculations align with actual seismic damage, providing a reference for seismic evaluation of breakwaters; (2) Gravel pile reinforcement effectively reduces overall breakwater deformation. During the early to mid-stage of the earthquake, the stiffness of the gravel piles dominates the behavior. In the mid to late stage, the permeability coefficient of the gravel piles becomes the primary influencing factor, with breakwater deformation decreasing as the permeability coefficient increases; (3) Both the Column-wall method and Equivalent area method successfully simplified the three-dimensional gravel piles cluster model into a two-dimensional plane strain model. The simulation results from both equivalent methods showed good agreement with the three-dimensional results. |
| Key words: breakwater liquefaction gravel piles elastoplastic nuclear power plants |
