| The freezing damage of many channels in large irrigation areas of Liaoning Province is mostly caused by frost heaving of seasonal frozen soil.It will provide reference for the construction of large irrigation areas in Liaoning Province,at the same time,It also has very important guiding significance for the prevention and control of frost damage in irrigation areas.Up to now,the three-field coupling model of frozen soil water and heat has been more mature.Many researchers have also established many numerical models for prototype lining channels,but the numerical simulation of indoor frost heaving canal foundation soil is relatively few.Accordingly,in order to further understand the effect of frost heaving of canal-based soil,finite element analysis is carried out using finite element method and ANSYS finite element software,and the following work is carried out in establishing the numerical model of indoor frost heaving canal-based soil from top to bottom unidirectional freezing:(1)In this paper,the finite element method and finite element software are used to simulate the numerical calculation of frost heaving in canal-based soil,The selection and calculation methods of thermodynamic parameters under different conditions of groundwater recharge and no groundwater recharge are given,which provides the basis for the establishment of indoor frost heaving numerical model and parameter selection of canal-based soil.(2)In view of the groundwater recharge,the numerical model of the canal-based soil in Hunsha Irrigation District,which has completed the indoor frost heaving test,is established,the finite element model of the canal-based soil is analyzed and calculated,and the temperature field and displacement field cloud map are calculated,It is concluded from the results that the error between the calculated results of frost heaving and the measured data is1.52,and the calculated results meet the accuracy requirements,which indicates that the analytical method can better simulate the frost heaving of canal-based soil and can be further studied.(3)The soil quality,density and moisture content of canal-based soil in Kaiyuan irrigation area without groundwater recharge were obtained by numerical simulation andanalysis,and the canal-based soil without groundwater recharge was taken.The difference between the frost heaving results of numerical simulation and the results of indoor frost heave verification test is 0.243,the error is 3.5,the error is small,and the precision requirement is satisfied.The numerical simulation analysis method based on canal soil is further improved.Through the numerical simulation of canal-based soil with and without groundwater recharge,the reliability of frost heaving law is verified by taking canal-based soil as the research object and establishing numerical model.(4)Through the thermal steady-state analysis and calculation of frost heaving channel in Kaiyuan irrigation area with 0 cm、8cm、9cm、10cm、11cm、12cm thickness polystyrene insulation board,it is concluded that the frost heaving amount of 10 cm benzene plate structure and 11 cm,12 cm benzene plate structure varies little and the insulation effect of the three is small. |
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