单戗条件下抛投强度对截流难度的影响研究  

The study on the impact of the dumping intensity to the closure difficulty under the condition of single peak embankment

作　　者：张静[1,2] 杨庆[1,2] 戴光清[1,2] 许杰[3] 

机构地区：[1]四川大学水力学与山区河流开发保护国家重点实验室,四川成都610065 [2]四川大学水利水电学院,四川成都610065 [3]中国市政工程西南设计总院,四川成都610081

出　　处：《水动力学研究与进展（A辑）》2014年第4期429-434,共6页Chinese Journal of Hydrodynamics

摘　　要：河道截流是水电工程建设过程中的控制性节点工程,实际截流工程中发现,增加抛投强度可以显著减少抛投料的流失,从而实现安全截流。从单位时间龙口水流的冲刷能力与抛投料的抗冲能力之间的平衡观点出发,该文提出了水流极限冲刷值的概念。对不同粒径条件下的水流极限冲刷值进行实验,由实验结果得出其经验公式,在此基础上提出:实际截流中的抛投强度大于合龙过程中的最大水流极限冲刷值便可顺利合龙。同时截流抛投强度与抛投料流失量之间的实验结果表明:在相同块石粒径的情况下,随着抛投强度的增加,块石流失量逐渐减小;当抛投强度达到一定强度后,流失量减小的速度逐渐放缓;在相同抛投强度下截流,抛投材料的粒径越大流失量越小。The river closure plays a control node role in the hydropower engineering project. In the actual process of the interception project, increasing the dumping intensity can significantly reduce the loss of the dumped material, so as to achieve the safety closure. From the point of view of the balance between the water washing ability of the closure gap and the anti-scouring ability of the dumped material in unit time, the paper introduces the concept of water flow limit erosion value. Based on the model test which gets the water flow limit erosion value in different block sizes, the paper reaches an empirical formula for calculating the flow limit erosion value and puts forward that it can be closured when the dumping intensity is larger than the largest water flow limit erosion value. And the test between the dumping intensity and the leaching out shows that in the same block size case, with the dumping intensity increasing, the loss of dumped material is gradually reduced; while when the dumping intensity reaches a certain strength, the trend of the reduced loss of the dumped material is gradually slowed down; in the same dumping intensity closure, the bigger of the dumped material particle size the less of the loss.

关 键 词：截流 抛投强度 极限冲刷值 流失量 

分 类 号：TV855[水利工程—水利水电工程]