The Research Of Application To Prevent Frost Heaving Technology In The Engineering Of Saving Water In Jingdian Irrigation

Jingdian Irrigation Area is located in central Gansu Province, east of Hexi Corridor, the provincial capital of Lanzhou to the North180km, Jingtai electric-irrigated area east of the Yellow River, bordering the north and the Tengger Desert, drought little rain, wind, belongs to the continental arid climate in engineering is a high head, large flow, multiple cascade power lift irrigation project. In a period, works by the two period and two period in Jingtai extends to the Minqin water transfer project is composed of three parts. In a period which is an independent water supply system, in two and survey engineering share a water system. In order to give full play to the effectiveness of engineering, cherish water resources, strengthen water commodity consciousness, make scientific, reasonable irrigation water, water saving, jepi does need to implement water-saving transformation project.In this paper, from the actual situation in Jingtai irrigated area from starting, need, governance Shiyang River Basin in Jingdian Irrigation needs of their own development, point of view, demonstrates the necessity of two renovation project in Jingtai irrigated area, at the start of the irrigation district reconstruction parameters were determined, in the analysis of irrigated areas, including:analysis of crop water balance, irrigation system and irrigation rate analysis, analysis of water demand and water supply, water quantity analysis. Then is the design of a water-saving transformation channel, on the basis of the irrigation canal in heave problem proposed solutions, and to channel frost up transformation of design. According to the actual situation of Jingdian Irrigation Areas, this paper design a suitable Jingdian Irrigation features, meet the canal safety operation, economical and practical, anti-freezing effect good impervious channel liner type, optimized design, can be used for engineering practice. The replacement of mixed sand gravel, canal is arranged at the bottom of blind ditch and drainage pipe, polyethylene impermeable membrane, the prefabricated concrete lining anti-freezing measures mainly on the canals are designed frost, estimate the sunshine shading degree, groundwater depth of frozen influence coefficient calculation, calculation, basic structure of frost heave displacement depth calculation, change base materials, finally obtained the trapezoidal cross section, a trapezoidal cross section design. Based on the irrigation design, analyzed the actual problems channel frost up technology that may be encountered in the actual application in Jingdian Irrigation Area, and demonstrates the practical channel anti-freezing treatment technology for water-saving transformation in Irrigation District, in order to improve the productivity of Jingdian Irrigation District, provide decision-making ideas and technical support to promote faster and better development of Jingdian Irrigation district.