Study On Problems Of Designing And Frozen Disaster Prevention & Curing On Seepage Control In Canal Engineering

The problem of using water resources reasonably is drawing government and scientists of attention in the world. In the processing of resolving water resources, besides the water storage engineering and the water diversion engineering should be built and the water resources should be enlarged necessarily, the more important problem is saving the water, increasing the utilization ratio of water , preventing the pollution of water and so on.The seepage control of canal is the important measure of saving water. The water efficiency in canal system of irrigation is very low in our country, and the proportion of the waste water is large. The results of many engineering cases proved that the seepage should be decreased for 70%~90%, and the water efficiency in canal system should be increased much. The function of seepage control of canal is as follows, firstly, the water efficiency in canal system should be improved; secondly, investment and circulation charge can be saved; thirdly, salinization and basification of soil should be prevented; fourthly, erotion, deposit, and collapse should be prevented.The author knew the development actuality and development direction of technique of the seepage control of canal in home land and outland in the paper after referring to literature and information, the paper introduced the measure of design of the seepage control of canal engineering, the factor that needed considering and the principia that should be followed based on the actuality of the seepage control of canal engineering in china, and the problem that should be attracted attention in design based on the climate, landform and amount of water in south different from that in north; the problem of frozen disaster and main influence factor lies in canal engineering in cold area of northeast, northwest and north China are discussed; and the mechanism of distortion of that lies in layer of soil, After analyzing cause of formation, experimentation and value that worked at locale about frozen stiff of seepage control of canal, the mechanism of destroy of frost distensibility in canal and the important influence factor are analyzed again, and the conclusion is drawn that the pressed condition and the ability of resisting frozen expansion of "U" section is better than echelon section after that the resistance distortion of "U" section and echelon section in canal is analyzed, and the blank of this theory is filled up. Finally, the principia and measure of prevention and cure of frozen disaster in canal of seepage control is put forward.