我国北方几个省(区)对混凝土衬砌防冻胀问题都采取了一些措施,积累了不少经验。这里将其中几项主要措施介绍如下,供工程设计中参考。一、铺设垫层(替换土的办法) 铺设垫层是我国北方几个省区应用较广的一种防冻胀措施,效果显著,但成本较高。垫层材料多为砾石土。所谓砾石土,据中国科学院冻土研究所资料,系指粉粘粒(<0.05毫米)含量<15%的碎 Several provinces (regions) in northern China have taken some measures to the anti-frost heaving of concrete lining and have accumulated a lot of experience. Here are some of the major measures introduced below, for engineering design reference. First, the laying cushion (replacement of soil approach) Laying cushion is a widely used in several provinces in northern China a kind of frost heaving measures, the effect is significant, but the cost is higher. Most of the cushion material is gravel soil. The so-called gravel soil, according to the Institute of Frozen Institute data, refers to the powder clay (<0.05 mm) content <15% of the broken