摘要
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。
The frost heave problem is the primary reason for low-utilization rate of canals in cold areas. Relying on the large-scale geotechnical centrifuge in Nanjing Hydraulic Reserch Institute, a heat exchange test device is designed. It can realize the coupling interaction between the centrifugal and temperature fields. Subsequently, the modelling tests on the frost-heave of canals in soils with different moisture contents under 20 g and 30 g respectively are perfromed. The results indicate that the distance between model and heat exchanging plate has great influence on heat exchange process. The moisture content has a significant effect on the frost-heave displacement. In addition, the law of heat migration rate in the soil, which is N2 times that of the prototype, is confirmed by the test results. The designed test device and the corresponding test method provide a new approach for the reserches on frost-heave damage of canals in the northern areas of Xinjiang Uygur Autonomous Region.
出处
《岩土工程学报》
EI
CAS
CSCD
北大核心
2016年第1期109-117,共9页
Chinese Journal of Geotechnical Engineering
基金
水利部公益性行业科研专项(201201037)
南京水利科学研究院国家重点实验室基本科研业务费项目(Y314006)
关键词
输水渠道
寒区
冻胀
离心模拟
换热过程
canal
cold area
frost-heave
centrifuge modelling
heat exchange process
