As important water transmission and distribution buildings,channels play an important role in irrigation,navigation,power generation and water supply.Channel design based on the hydraulics of the reasonable slope requirements and by the selection of the conditions of the constraints,part of the channel needs to go through the higher terrain,the elevation of the channel floor is lower than the natural ground,due to atmospheric rainfall and other reasons the groundwater level is often higher than the channel floor,groundwater pressure will be lined channel floor caused by the top of the support damage,this causes leakage in the channel.channel leakage is a common disease,there are a number of measures to address the disease,but the measures used by the equipment generally have a short life,operation and maintenance inconvenience and other problems.To address this problem,the team developed A,B two types of new drainage relief check valve,and its drainage and anti-silt blocking performance test,and at the same time on the installation and non-installation of check valve lined channel anti-floating stability numerical simulation,the results show that:A,B two kinds of valves can be applied to the actual project,but for anti-silt blocking requirements of high channels,should choose a larger overwater area of the B-type valves;under the head difference of 0.5 m,1.0 m,1.5 m and 2.0 m,the pore water pressure of the channel equipped with the check valve decreased by 92.2%,32.1%,27.7%and 23.7%,respectively,compared with that of the channel without check valve,which indicates that the new type of check valve has obvious effect on the drainage of lined channel to drain off the pressure,and it can play an effective role in the protection of the lined channel.
Aqueductcheck valvedamaged by flotationwater seepagedrain
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