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我国有规模地开展渠道防渗始于20世纪60年代,渠道防渗形式主要有塑模、混凝土预制或现浇板、浆砌石等。在北方季节性冻土地区,这些防渗工程均存在不同程度的冻胀破坏问题,往往在修建数年后即遭到破坏,给渠道的管理和运行造成诸多困扰。20世纪七八十年代以来,关于对渠道防渗工程的冻胀问题开展了多项试验与研究,并取得了一系列研究成果,使渠道冻胀防治技术取得了突破性进展。文章分析了严寒地区渠道产生冻胀的原因,着重阐述渠道做抗冻设计时应注意的问题,并提出了对渠道防治冻害的有效措施。
Our country has carried out the scale of anti-seepage channels began in the 20th century 60’s, the main channel impervious form of plastic, concrete precast or cast-in-place board, masonry and so on. In the northern seasonal permafrost regions, these seepage control projects all have varying degrees of frost heaving and destruction problems, often being destroyed after being built for several years, causing many troubles to the channel management and operation. Since the seventies and eighties of the 20th century, many experiments and studies have been carried out on the frost heaving problems of the canal seepage control project. A series of research results have been achieved, making a breakthrough in the prevention and control of canal frost heaving. This paper analyzes the causes of frost heave in channels in severe cold regions, emphasizes the problems that should be paid attention to when frost channels are designed, and puts forward effective measures to prevent frostbite in channels.