Numerical Simulation Of Lining Channel’s Polystyrene Insulation Board With Anti-freezing Effect

Because of the negative temperature effect, the existing channels and anti-seepageengineering are subjected to frost-heaving damage in varying degrees, in ours seasonal frozensoil areas. This phenomenon not only affects the normal operation of the systems engineeringand increases the cost of the engineering management and maintenance, but also affects theseepage control effect. The main reason for this is because the research about frost heave ofchannel foundation soil is not clearly understood. In channels and anti-seepage engineering’splanning and design, under the condition of negative temperature, soil presents the uniquephysical and mechanical property and the characteristics of canal operation in winter, whichare not adequately considered. Therefore, how to take effective technical measures ofanti-freeze and anti-expansion has become a real issue which bother irrigation area’s healthydevelopment, in the permafrost region.After reading and consulting many correlative materials information, this paper discussesthe development of channel on aspect of frost heave at home and abroad. AND introduces thechannel’s mechanism of frost heave and three major factors which affect the soil’s frost heave:temperature, water and soil. The thesis concludes several measures of anti-freeze andanti-expansion which are frequently used in channel at present. And this paper also does theresearch from the following aspects：Polystyrene board has a wide application as a ditch-lining insulation material. Thisarticle based on the tests, as a basic law of canal lining frost heave and characteristics ofdamage, aim at actual engineering problem, computer simulations is mostly based on theapplicable simplification and hypotheses, and view the frozen soil and canal lining as a whole.We utilize the ANSYS to analyze the influence of various insulation board thicknesses oncanal’s direct heat-stress transient coupled field by according to isotropic permafrost medium.Under different insulation measures simulated conditions, we can obtain distribution laws oflining channels’ temperature and displacement fields, in the coldest time, and also obtain frost heave values of seven key points which are easily destroyed by frost heave, in every time of afreezing and thawing cycle period. By comparison analysis, laying reasonable and economicalthickness for insulation boards, at different positions of the canal, are12cm at north slope and8cm at sunny slopes and bottom slope.By comparing simulation results and test results, on channels’ north slope and sunnyslope, the error estimation of above two approaches is between7.5%~18.5%. This illustratesthe paper presents model and calculated methods are reasonable and achievable. It providessome significant practical guiding for the project and practicality value for the design ofcanal’s frost-heaving and construction, in the future.