考虑复合材料传热作用的渠道保温抗冻性能研究

Study on Frost Heave Resistance of Canal Concrete Lining Insulation Structure Considering Transfer Heat Principle of Composite Materials

渠道设置复合保温材料会削减基土冻胀力,削减渠道坡板不均匀冻胀后产生的位移,但研究尚未探明渠道复合保温材料抗冻机理。以新疆玛纳斯电站引水梯形渠道衬砌结构下施加高分子聚合材料为实际工程背景,考虑复合材料界面接触热阻本构及冻土与复合材料的相互作用关系,依据渠道热力耦合机理建立了寒区渠道混凝土衬砌保温结构冻胀模型,提出了3种新型复合材料保温形式,并采用COMSOL Multiphysics5.2a进行数值仿真对比分析。结果表明:与普通渠道相比,3种保温形式均具有一定的效果,且第3种保温形式的抗冻性和保温效果最明显,该形式作用下渠阴坡、渠阳坡、底板最大法向冻胀位移分别为9.63、4.74、1.87 cm,形式1、形式2、形式3较原型渠道冻胀力分别减少65.8%、76.2%、89.5%。

The installation of composite insulation material in canals will reduce the frost heave force of foundation soil and the displacement caused by uneven frost heave of canal slope plate.However,the research on the anti⁃freezing mechanism of composite insulation material in canals has not been proved.In this paper,the application of polymer material under the canal lining structure of Xinjiang Manas Power Sta⁃tion was taken as the actual engineering background.Considering the interaction between composite materials and the interaction between fro⁃zen soil and composite materials,the frost swelling model of concrete lining insulation structure in cold area was established according to the canal thermodynamic coupling mechanism,and three new composite insulation forms were proposed and analyzed by COMSOL Multiphysics 5.2a.The results show that compared with the conventional canal,the three thermal insulation methods have certain thermal insulation effect,and the third one has the most obvious frost resistance and thermal insulation effect.Under the action of this form,the maximum normal dis⁃placement of shady slope,sunny slope and base⁃plate is 9.63 cm,4.74 cm and 1.87 cm respectively and compared with the prototype canal,the frost heaving force of form 1,form 2 and form 3 is reduced 65.8%,76.2%and 89.5%respectively.