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冻胀破坏是导致寒冷地区渠道输水利用系数低的主要原因。依托南京水利科学研究院大型土工离心机成功研制了热交换试验装置,该装置实现了渠道模型在离心场中与温度场的耦合。在此基础上开展了20g和30g下的不同渠基土含水率冻胀离心模拟的模型试验,根据试验结果探讨了渠道离心模型的换热过程以及封闭系统中渠基土含水率对渠道法向冻胀位移的影响。此外,根据试验结果验证了离心场下土体模型内传热速度是原型的N2倍的关系。所提出的渠道冻胀离心模拟装置和试验方法为北疆地区输水渠道冻害处治提供了新的研究手段。
Frost heaving destruction is the main reason for the low water utilization coefficient of channels in cold areas. Based on the large geocentrifuge of Nanjing Hydraulic Research Institute, a heat exchange test device has been successfully developed, which has realized the coupling of the channel model with the temperature field in the centrifugal field. On the basis of this, the model tests of 20g and 30g centrifugal tests on moisture content of different foundation soil are carried out. According to the experimental results, the heat transfer process of channel centrifugal model and the influence of moisture content of canal foundation soil in channel system Influence of frost heave displacement. In addition, according to the experimental results, it is verified that the heat transfer rate in soil model under centrifugal field is N2 times of the prototype. The proposed channel frost heaving centrifuge simulation device and test methods provide a new research method for the treatment of freezing damage of water conveyance channels in northern region.