Study On Optimization Of Small Farmland Seepage Control Channels With Different Structure Types

At present,water shortage has become a widespread concern in the world.In recent years,because of the rapid growth of agriculture in China,food production has increased year by year,and the amount of irrigation water in the field has been increasing.At the same time,the problem of water wastage in the canal is increasing.The root cause is mainly the leakage of irrigation channels.The leakage of channels has caused a large loss of water in the field,resulting in the waste of water resources.In this regard,China proposes a method of water-saving irrigation,and the channel anti-seepage project is an important way to save water.,has been widely concerned and studied by scholars.Therefore,this paper takes Bayi Irrigation District as an example to optimize the research of farmland anti-seepage channels with different structural forms,which is of great significance for water-saving irrigation and promoting the healthy development of agriculture.Firstly,according to the section of the anti-seepage channel,the section size of the selected typical block is designed.The ladder type seepage prevention channel: the bottom width is 0.3m,the channel depth is 0.4m,the slope coefficient is 1.14,and the rectangular anti-seepage channel: the bottom width is 0.33 m.The channel depth is 0.4m;U-shaped seepage prevention channel: radius 0.15 m,channel depth 0.4m.According to the design of the anti-seepage channel structure,the structural type of the selected block anti-seepage channel is 80 mm in thickness,8mm in rebar,200 mm in rebar distribution,C25 in concrete,F100 in anti-freeze and W4 in anti-seepage.Secondly,according to the design result of the anti-seepage channel structure,the cost per mile of the anti-seepage channel,the construction progress and the anti-frosting property are calculated.It is concluded that the cost per mile of the ladder type anti-seepage channel is 82130 yuan,the construction period is 332.3hours,the frost heave of the slope is 4.18 cm,the frost heaving of the bottom surface is 4.14 cm,and the cost of the rectangular anti-seepage channel is 105785 yuan per kilometer.The construction period is 102.5 hours,the frost heave of the slope is 4.79 cm,and the frost heaving of the bottom surface is 4.61cm;the U-type seepage channel is priced at 86,975 yuan per kilometer,the construction period is 63.2 hours,and the frost heave of the slope is The amount of frost heave of 4.06 cm and the bottom surface was 4.08 cm.Finally,based on the comparative analysis of the cost,construction progress and frost heaving resistance of the three anti-seepage channels,the ladder-type anti-seepage channel,the rectangular anti-seepage channel and the U-shaped anti-seepage channel applicable to the Bayi Irrigation District are The fuzzy comprehensive evaluation is carried out.Firstly,the cost,construction schedule and frost resistance are selected as the evaluation factors.The weights of the three evaluation factors are determined by the analytic hierarchy process.The grey correlation coefficient is used to solve the comprehensive evaluation matrix.Finally,the evaluation matrix and the weight vector set are used to calculate.The optimal anti-seepage channel type is U-shaped anti-seepage channel.