西北寒区渠道工程冻融灾害链式试验研究摘要：我国大部分地区都处于季节性冻土区和永久冻土区，纬度较高，存在的主要灾害为渠道冻胀破坏。本文针对渠道冻胀灾害发生形成的条件，依据链式灾害理论，对渠道衬砌结构冻胀破坏的形成与发展做了详细的说明。通过建立渠道冻胀破坏链式模型，结合现场原型渠道试验，得到了冻结期的相关数据，最后通过对渠基土体温度场与应力应变场变化分布规律的研究，得到了渠道冻胀破坏过程中渠道不同部位的最大冻深，为今后渠道工程的实施提供帮助。关键词：冻土区；渠道冻胀；冻结期；应力应变场Chain Experiment of Freezing - thawing Disaster in Channel Works in Cold Regions of Northwest ChinaAbstract: Most parts of our country are in seasonal frozen and permafrost regions with high latitudes. The main disaster is the destruction of canal frost heaving. In this paper, according to the formation conditions of canal frost heave disasters and according to the chain disaster theory, the formation and development of frost heave of channel lining structure are described in detail. By establishing a chain model of frost heaving and destroying channels and combining with the prototype test in the field, the relevant data of the freezing period are obtained. Finally, through the study of the variation of temperature field and stress and strain field in canal foundation, In the different parts of the channel the largest deep-frozen, the channel for the implementation of the project to provide help.Key words: Permafrost；Channel frost heave；Freeze period；Stress-strain field0 引言渠道是我国输送水资源的重要方式[1-2]，而北方季节冻土区渠系利用率很低[3]，主要是由于渠基土冻胀发生破坏，降低了渠道输水功能的效率，导致了大量灌溉水渗漏[4]。渠道工程在寒区受到冻胀破坏的影响情况严重，因此解决渠道防渗抗冻胀问题是发展节水农业的重要保障[5]。二十世纪六十年代，陈爱新[6]等依据毛细理论对土体产生冻胀力以及冻胀进行分析并给出了定量计算,提出冰透镜体之所以产生是由...
