文章摘要
碾压混凝土分层碾压离散元模拟及施工成层细观机理研究
Study on Discrete Element Simulation of RCC Layered Compaction and Meso-Mechanism of Construction-induced Interfaces
投稿时间:2024-01-20  修订日期:2024-07-16
DOI:
中文关键词: 碾压混凝土坝  施工成层  细观机理  层间结合质量  碾压参数  离散元模拟  碾压试验
英文关键词: Roller-compacted concrete dam  construction-induced interfaces  meso-mechanism  joints bonding quality  compaction parameters  discrete element simulation  compaction test
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目)
作者单位邮编
刘东海* 天津大学水利工程智能建设与运维全国重点实验室 300350
马子茹 天津大学水利工程智能建设与运维全国重点实验室 
孙龙飞 天津大学水利工程智能建设与运维全国重点实验室 
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中文摘要:
      碾压混凝土(Roller Compacted Concrete,RCC)坝特有的大仓面分层碾压工艺带来的层间结合质量问题,是影响RCC坝安全运行的重要因素。从施工控制的角度揭示RCC施工成层机理,进而合理调整碾压参数,可有效保证大坝的施工质量。首先,通过RCC分层碾压试验,分析了碾压过程中含层面RCC的沉降规律、压实度及抗剪强度,为后续离散元模拟提供了基础;然后,建立并验证了RCC双层碾压与抗剪试验离散元模型;最后,给出了表征层间结合质量的骨料嵌入值指标,进而从孔隙率、层间骨料嵌入、层间应力分布、层间抗剪强度等方面分析了RCC施工成层的细观机理。结果表明:激振力的增加以及行进速度、碾压厚度的减小均有利于提高层间结合质量,且碾压厚度是影响层间结合质量的最敏感参数。研究结果可为实际施工中RCC层间结合质量控制标准的制定提供理论依据。
英文摘要:
      The unique layered compaction process of large working area determines that the joints bonding quality between layers is the key to the operation safety of roller-compacted concrete (RCC) dam. Revealing the RCC construction-induced interfaces mechanism from the perspective of construction control and adjusting the compaction parameters can effectively ensure the construction quality. First, the change law of compaction settlement, compaction degree and shear strength of RCC during layered compaction process were tested, which provides a basis for discrete element simulation. Then, the discrete element models of RCC double-layer compaction and shear test were established and verified. Finally, the aggregate embedding value which characterizes the joints bonding quality was defined, and the meso-mechanism of RCC construction-induced interfaces was analyzed from the aspects of porosity, aggregate embedding, joints stress distribution and shear strength. The results show that the increase of exciting force and the decrease of rolling speed and lift thickness are beneficial to improve the joints bonding quality, and the lift thickness is the most sensitive factor affecting the quality. This study provides a theoretical support for controlling the joints bonding quality during RCC construction.
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