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寒冷地区输水渠道在运行过程中,由于持续负温的影响,地温逐步下降,引起渠基土体水分分布发生变化导致土体冻胀,致使输水渠道结构破坏,这种作用影响所表现出来的链式效应是冻胀破坏作用的重要特征.为了探明寒冷地区输水渠道冻胀破坏机理,分析渠道的冻胀破坏因素,引入链式破坏理论进行分析.从系统理论出发,分析冻胀破坏系统的链式关系结构,建立冻胀破坏链式效应关系模型.以寒冷地区渠道衬砌结构冻胀破坏为例,分析经过一个冻融周期,渠基土体颗粒、土体成分组成、气温、地温变化规律和土壤水分迁移规律对渠道衬砌结构冻胀破坏的影响.分析渠道衬砌结构冻胀破坏链式机理,是在外部环境气温、水分等条件输入下,地温分布受土体性质及土体水分的影响,土体水分迁移受地温和土体性质的作用,土体产生冻胀是对地温和水分分布作用的响应,以此为依据提出寒区渠道冻胀破坏断链减灾方法.
In the cold area, due to the influence of the continuous negative temperature, the ground water temperature is gradually decreased due to the continuous negative temperature and the water distribution in the foundation soil is changed, which leads to the frost heave of the soil, resulting in the structural damage of the water conveyance channel. Is an important feature of the frost heaving destruction.In order to find out the mechanism of frost heave and destruct in the water conveyance channel in the cold area and analyze the frost heaving destruction factor of the canal and introduce the chain destruction theory, The relationship between the chain structure of the system and the frost heaving destroys the chain effect is established.Taking the frost heave of the channel lining structure in the cold area as an example, after a period of freezing and thawing, the composition of the soil foundation, The change rule of ground temperature and the rule of soil water migration on the frost heave failure of the channel lining structure.The analysis of the chain mechanism of the frost heave and failure of the channel lining structure is based on the input of external ambient temperature and moisture conditions, Moisture, the soil moisture migration is affected by the geothermal and soil properties, and the frost heave produced by the soil is the response to the geothermal water distribution. According to the proposed channel frozen cold chain scission area damage mitigation methods.