水利水电技术2018，Vol.49Issue(2)：63-69,7.DOI:10.13928/j.cnki.wrahe.2018.02.010
冰盖对南水北调中线工程渠道作用力物理模拟试验研究
Physical simulation-based experimental study on acting force from ice-cover on canal of the South-to-North Water Diversion Middle Route Project
摘要
Abstract
In order to explore the formation process and the action law of the acting force from ice-cover on the slope of the canal of the South-to-North Water Diversion Middle Route Project,the experiments of freshwater freeze and temperature rise of freshwater-ice are carried out through the simulation made on the canal in a low-temperature environmental laboratory.The study finds out that the thickness of ice-cover continuously increases along with the decrease of temperature,while the ice force changes thereupon as well.However,due to the mutual counteraction between the pressure from the phase-transitional volumetric swelling caused by the ice frozen from the water under ice and the tensile force caused by the ice-cover due to cold shrinkage during frozen period,the impact from the ice force is less,which can almost be neglected.Though the ice temperature during temperature rise period presents a rising trend,the ice is to slowly increase during the period of that the temperature under ice is lower than the freezing-point temperature,while the thermal swelling force significantly increases until the near-disappearance of temperature gradient inside of the ice layer,namely,the ice temperature approaches to the freezing-point temperature.After that,the icecover comes into the melting phase-transition and the ice force begins to decline along with the further increase of the temperature.The study result has a certain referential value for the study on safe operation of canal during ice-period and the mechanism of the action from ice-cover on the slope of canal.关键词
冰盖/膨胀力/渠道/边坡/南水北调中线工程Key words
ice-cover/swelling force/canal/slope/South-to-North Water Diversion Middle Route Project分类
建筑与水利引用本文复制引用
侯倩文,冯晓波,李志军,夏富洲..冰盖对南水北调中线工程渠道作用力物理模拟试验研究[J].水利水电技术,2018,49(2):63-69,7.基金项目
国家科技支撑计划课题(2015BAB07B04) （2015BAB07B04）
国家自然科学基金委项目(51579028) （51579028）
