摘要
针对混凝土裂缝演化分析模型无法同时考虑可溶物质溶解及可移动固体迁徙的问题,基于流体力学及溶解扩散理论,采用格子Boltzmann方法及随机生长法建立考虑物质随机分布、Ca(OH)_(2)溶出及可移动固体迁徙的混凝土裂缝渗流-溶蚀模型,并验证模型可靠性,探究可溶物表征方式、物质分布、渗流速度和可溶物质量分数对混凝土裂缝演化的影响。研究结果表明,该模型能较好地表征混凝土裂隙内水的流动、离子扩散以及可移动固体迁徙。在可溶物随机分布情况下,混凝土达到与可溶物均布时的溶解深度所需的时间明显增加。若Ca(OH)_(2)等可溶物被细骨料等不溶物包围,则渗流通道难以扩大、渗流量增长缓慢。混凝土溶蚀深度增长速率随渗流速度的增大而提高,在渗流速度达到一定值时趋于稳定。混凝土裂缝扩展程度通常随可溶物质量分数的增加而加剧。
To address the problem that the existing analytical model for concrete crack evolution cannot simultaneously consider the dissolution of soluble substances and the migration of movable solid particles,based on theories of fluid mechanics and dissolution diffusion,a seepage-dissolution model for concrete crack was established using lattice Boltzmann method and random growth method,considering random distribution of substances,dissolution of Ca(OH)_(2),and migration of movable solid particles.The reliability of this model was verified.The influence of soluble substance characterization,substance distribution,seepage velocity,and soluble substance content on concrete crack evolution was explored.The results indicate that this model can well characterize the water flow,ion diffusion,and migration of movable solid particles in concrete cracks.Considering the random distribution of substances,the time required for concrete to reach the same dissolution depth increases significantly.If soluble substances such as Ca(OH)_(2) are surrounded by insoluble substances like fine aggregates,the seepage channel is difficult to expand and the seepage discharge increases slowly.The increasing rate of concrete dissolution depth increases with the increase of seepage velocity,and tends to stabilize when seepage velocity reaches a certain value.The extent of concrete crack propagation usually identifies with the increase of soluble substance content.
作者
赵晨阳
雷明锋
贾朝军
鲁光银
崔振东
张忠良
ZHAO Chenyang;LEI Mingfeng;JIA Chaojun;LU Guangyin;CUI Zhendong;ZHANG Zhongliang(School of Mechanics and Civil Engineering,China University of Mining and Technology,Xuzhou 221116,China;School of Civil Engineering,Central South University,Changsha 410075,China;National Engineering Research Center for High-Speed Railway Construction Technology,Changsha 410075,China;School of Geosciences and Info-physics,Central South University,Changsha 410075,China)
出处
《中南大学学报(自然科学版)》
北大核心
2025年第6期2335-2345,共11页
Journal of Central South University:Science and Technology
基金
国家自然科学基金资助项目(52378420)
中国国家铁路集团有限公司科技研究开发计划项目(L2024G009)
湖南省自然科学基金资助项目(2024JJ9080)。
