整体式U形渠道不同断面结构抗冻胀性研究

针对倾角与渠道衬砌抗冻胀性定量关系存在不足的问题，以河套灌区D80整体式U形渠道为例，结合力学模型和数值模拟，分析不同条件下适用于当地冻胀环境的整体式U形渠道断面结构.结果表明:倾角越小渠道越窄深，渠顶水平冻胀量越大，渠底应力越大；反之，倾角越大渠道越宽浅，渠底竖向冻胀量越大.渠基土冻胀性、渠道混凝土衬砌强度和厚度对渠道抗冻胀性影响较大.对于亚黏土基土，选择0.07m厚衬砌，10°倾角为宜；对于粉土基土，选择0.08m厚衬砌，13°倾角为宜.

Study on Frost Heave Resistance of Different Section Structures of U-Shaped Canal

Aiming at the insufficient quantitative relationship between the obliquity and frost heave performance of canal lining， the mechanical model and numerical simulation were combined to study suitable U-shaped canal cross-section structure for local frost heave environment under different conditions， taking the D80 U-shaped canal as an example in Hetao irrigation district， Inner Mongolia. The results show that the smaller the obliquity and the narrower and deeper the canal， the greater the horizontal frost heave at the top of canal and the lager the stress at the bottom of canal. Conversely， the larger the obliquity and the wider and shallower the canal， the greater the vertical frost heave at the bottom of canal. The frost heave property of foundation soil and strength and thickness of concrete lining have a great effect on the frost heave resistance of canal. For loam soil， it is appropriate to choose 0.07m thick lining， 10° obliquity， and for silt soil， choose 0.08m thick lining， 13° obliquity.