基于TCR传热原理的混凝土复合保温衬砌渠道防冻胀效果研究  

Anti-frost heave effect of lining channel with concrete composite insulation based on TCR principle

作　　者：郭瑞[1] 王正中[1,2] 牛永红[2] 刘铨鸿[1] 王羿[1] 

机构地区：[1]西北农林科技大学水利与建筑工程学院,杨凌712100 [2]中国科学院寒区旱区环境与工程研究所冻土国家重点实验室,兰州730000

出　　处：《农业工程学报》2015年第20期101-106,共6页Transactions of the Chinese Society of Agricultural Engineering

基　　金：国家自然科学基金项目(51279168);国家科技支撑计划项目(2012BAD10B02);冻土工程国家重点实验室项目(SKLFSE-201105);高等学校博士学科点专项科研基金项目(20120204110024)

摘　　要：中国北方寒冷地区广泛采用保温措施进行渠道防冻胀,在苯板保温防冻胀设计中铺设厚度一般根据半理论半经验确定,并没有考虑衬砌板与保温板接触热阻及交错布置对保温性能与削减冻胀的影响。该文依据固体材料接触热阻(thermal contact resistance,TCR)原理与压力相关的传热本构模型,提出了混凝土复合保温衬砌新型式。通过ABAQUS有限元软件采用热力耦合模拟将其与普通型式的苯板保温渠道进行比较。结果表明:与普通保温衬砌渠道相比,外界负温时,复合保温衬砌的保温及消减冻胀力效果显著。理论上复合保温衬砌冻胀量消减40%以上,法向冻胀力减少66%,切向冻结力减小58%。对寒区衬砌渠道保温防冻胀设计提供了相应的理论参考。In cold regions of northern China, the anti-frost heaving measures of lining channels were widely used. In the design of anti-frost heaving benzene insulation board, laying thickness was generally determined on the basis of semi-theoretical and half-experience analyses. However, it did not consider the thermal contact resistance（TCR） between canal lining and insulation board, as well as the influence of the staggered arrangement on thermal-insulating performance and anti-frost heave. Therefore, original canal insulation model was too idealistic. Based on the principle of TCR of solid materials and the stress-related heat transfer constitutive model, the paper presented a new concrete composite insulation lining. In order to explore the effect of anti-frost heaving capability and the anti-frost heaving mechanism, taking a trapezoidal channel in Altay irrigation area of northern Xinjiang as the simulation object and considering the impact of the frost heaving, the prototype channel model was set up. Based on this model, the anti-frost heaving effect of the EPS（expanded polystyrene） thermal insulation board on the channel was analyzed. The temperature field, stress and displacement field were calculated and analyzed by the thermo-mechanical coupling field finite element method. The composite thermal-mechanical simulation was used to compare the new one and the ordinary benzene insulation board by means of the finite element software ABAQUS. Simulation results showed that for the temperature field, the zero degree isotherm in the composite insulation lining channel soil was higher than that in the channel with EPS insulation board, and the maximum difference was nearly 20.3 cm. The concrete composite insulation lining could not only block the conduction of the negative temperature outside and improve the temperature of the soil, but also reduce the freezing depth of the soil and improve the anti-frost heaving ability effectively. For the displacement field, the distribution of the frost heaving amounts in the

关 键 词：混凝土衬砌 保温 模型 EPS保温板 TCR 复合保温 防冻胀 

分 类 号：TV698.26[水利工程—水利水电工程]