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何芳婵,李威,褚青来,吕正勋,李世伟.坝坡垫层料降雨冲蚀破坏机理研究[J].河北工程大学自然版,2022,39(1):72-77
坝坡垫层料降雨冲蚀破坏机理研究
Study on Rainfall Erosion of Earth-rock Dam Slope Cushion Material
投稿时间:2021-11-02  
DOI:10.3969/j.issn.1673-9469.2022.01.011
中文关键词:  土石坝  垫层料  强降雨  渗透  冲蚀
英文关键词:earth and rockfill dam  cushion material  heavy rainfall  permeability  erosion
基金项目:河南省水利科技攻关计划项目(GG201934)
作者单位
何芳婵 河南省水利科学研究院, 河南 郑州 450003
河南省水利工程安全技术重点实验室, 河南 郑州 450003 
李威 南京水利科学研究院 岩土工程研究所, 江苏 南京 210024 
褚青来 河南省燕山水库管理局, 河南 叶县 467224 
吕正勋 河南省水利科学研究院, 河南 郑州 450003
河南省水利工程安全技术重点实验室, 河南 郑州 450003 
李世伟 河南省水利科学研究院, 河南 郑州 450003
河南省水利工程安全技术重点实验室, 河南 郑州 450003 
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中文摘要:
      针对燕山水库大坝开展三维有限元瞬态流固耦合计算,对强降雨条件下坝坡降雨入渗过程进行模拟,在降雨入渗模拟结果分析的基础上,结合坝坡垫层料颗粒特性分析及现场勘测结果,研究了坝坡垫层料降雨冲蚀破坏过程,研究结果表明:降雨入渗是导致下游坝坡垫层料冲蚀的主要原因,水力梯度大于垫层料最小临界水力梯度值的区域是发生冲蚀的主要区域;降雨入渗过程中,随着细颗粒的不断流失,垫层料的颗粒级配趋于劣化,预制块与垫层料之间出现脱空等现象;为保障下游坝坡的安全,应对垫层料的颗粒级配进行调整设计,提高垫层料的临界水力梯度值,并通过调整预制块、设置排水沟等方式增强坝坡的排水能力。
英文摘要:
      Based on the three-dimensional finite element transient fluid structure coupling calculation of Yanshan Reservoir Dam, the rainfall infiltration process of dam slope under heavy rainfall was simulated. On the basis of rainfall infiltration simulation results, combined with the particle characteristics analysis of dam slope cushion material and field survey results, the rainfall erosion process of dam slope cushion material was studied. The results show that: rainfall infiltration is the main cause of the erosion of the cushion material of the downstream dam slope, and the area where the hydraulic gradient is greater than the minimum critical hydraulic gradient of the cushion material is the main area of erosion; in the process of rainfall infiltration, with the continuous loss of fine particles, the particle gradation of cushion materials tends to deteriorate, and the voids between precast blocks and cushion materials appear; in order to ensure the safety of downstream dam slope, it is suggested to adjust and design the particle gradation of cushion material, improve the critical hydraulic gradient value of cushion material, and enhance the drainage capacity of dam slope by adjusting precast block and setting drainage ditch.
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