坝坡垫层料降雨冲蚀破坏机理研究

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...

Study on Rainfall Erosion of Earth-rock Dam Slope Cushion Material

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.