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一前言黑龙江省大部份地区,属季节性冻土地区,年平均气温3°～2℃,一月份平均气温在零下18°～28℃之间,最低可达-50℃,平均最大冻深在1.8～2.8米.大量的工程调查表明,我省季节性冻土地区的渠系工程,因其工程地质与工程结构等不同,均遭不同程度的冻害,其数量轻的占60%,重者多达80%.据牡丹江地区某灌区调查,仅跌水工程一项遭受冻害者占工程总数的60%.其特点之一是挡土墙和跌坎受冻胀和冻融的影响,轻则裂缝张口,重则产生倾斜或水平位移.之二是上下游护坦和消力池
Preface Heilongjiang Province, most of the region, is a seasonal frozen soil area, the annual average temperature of 3 ° ~ 2 ℃, the average January temperature of minus 18 ° ~ 28 ℃, the lowest up to -50 ℃, the average maximum deep freezing depth 1.8 ~ 2.8 meters. A large number of engineering surveys show that in our province seasonal frozen soil area canal project, due to its different engineering geology and engineering structure, are subject to varying degrees of frost damage, the light weight accounted for 60% of the weight Up to 80% .According to a survey in an irrigation area in Mudanjiang Prefecture, only a waterfall project suffered frost damage accounts for 60% of the total number of projects.Its characteristic is the retaining wall and falling ridge by the impact of frost heaving and freezing and thawing, light The crack mouth, weight is tilted or horizontal displacement of the second is the upper and lower escort and power pool