Research On Application Of Control Method Of Combined Drainage For Seepage Drainage System Of Dam

When the construction of the reservoir around the mountain is finished,leakage,which finally forms underflow,will exist in the dam body and the internal structure of the mountain surrounded by the dam,due to that the permeability of covering layer the water level is relatively significant and to the impact of water level and pressure on the water storage side and the mountain.In order to solve this problem,water collecting well is built for the dam leakage.Via optimizing the internal control logic of the drainage system,reasonable frequency of start/stop of drainage bump and the change regularity of water level in the well are researched.First,by observing the variation curve of the water level in the water collecting well of dam leakage,the main problems about the automatic control logic of the seepage drainage system of dam are analyzed,which are then used to optimize the control logic of the seepage drainage system,and each optimization code segment and function block is verified certified value.Second,the current start/stop rule is optimized combining with the bump operation.Mathematical model is built to simulate the changing rule of water level in collecting well,during which the optimized fixed value is decided,to reduce the frequency of start/stop of the drainage bump.Then,based on varying rate of the water level in collecting well,the effect of water level and inflow of the reservoir on the varying rate of the water level in collecting well are researched.Via mathematical model,varying characteristic of the water level in collecting well during drought season and wet season are explored,to find out the most suitable operation rule and the spacing interval between two neighboring operations of the bump,and reduce the start/stop frequency of the bump further.Finally,several type of typical faults often seen in seepage drainage system of dam are explained,in which the failure cause,failure point and effect of outer automatic components on combined drainage mode and the corresponding treatment are analyzed and discussed.Improvements and advices for the configuration of the seepage drainage system of dam are put forward in the paper.The optimization result of simulation test in the paper is applied in engineering practice,realizing the design of combined drainage,which provides a good reference solution for the design and applying of automatic control logic of auxiliary machinery system including seepage drainage system,overhaul drainage system etc.