光伏直驱压缩式制冷装置对多年冻土路基热稳定性的影响  

Influence of solar direct-drive compression refrigeration apparatus on thermal stability of permafrost embankment

作　　者：孙兆辉 刘建坤 游田 郝中华 胡田飞 房建宏 SUN Zhaohui;LIU Jiankun;YOU Tian;HAO Zhonghua;HU Tianfei;FANG Jianhong(School of Civil Engineering,Sun Yat-sen University,Guangzhou 510275,China;School of Civil Engineering,Beijing Jiaotong University,Beijing 100044,China;State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures,Shijiazhuang Tiedao University,Shijiazhuang 050043,China;Qinghai Research Institute of Transportation,Xining 810001,China)

机构地区：[1]中山大学土木工程学院,广东广州510275 [2]北京交通大学土木建筑工程学院,北京100044 [3]石家庄铁道大学省部共建交通工程结构力学行为与系统安全国家重点实验室,河北石家庄050043 [4]青海省交通科学研究院,青海西宁810001

出　　处：《中南大学学报（自然科学版）》2023年第5期2006-2019,共14页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(41731281,42171130,42001059)。

摘　　要：针对工程扰动引起的多年冻土退化与路基热稳定性问题,基于光伏发电技术与制冷技术,开发一种用于防治多年冻土退化的光伏直驱压缩式制冷装置,并开展现场应用测试与数值模拟研究。研究结果表明:新装置能够适应多年冻土地区的严寒环境,实现自动化运行,且装置运行期间,制冷管管壁热流密度随太阳总辐射量的增大而增大,平均热流密度为-4.1~-6.3 W/m^(2)。与普通路基相比,制冷路基的热学稳定性得到显著提升,其中,冻土人为上限随着制冷管长度与管壁热流密度的增大而提高,随着制冷管埋置深度的增大先提高后降低,而冻土升温速率则随着制冷管长度、埋深与管壁热流密度的增大而降低。基于灰色关联理论分析可知,制冷功率对人为上限影响最显著,制冷管长度的影响次之,埋置深度的影响最小;而冻土升温速率对制冷管埋置深度最敏感,制冷功率次之,制冷管长度最小,建议设计施工时优先选择更为显著的因素加以调控。To improve the problems of permafrost degradation and embankment thermal stability caused by engineering disturbance,the solar direct-drive compression refrigeration apparatus for preventing permafrost degradation was invented based on solar power generation technology and refrigeration technology.The performance of the apparatus was tested by field test,and various working conditions were analyzed by numerical simulation.The results show that the new apparatus can adapt to the severe cold environment in the permafrost region and realize automatic operation.During the operation of the apparatus,the heat flux of the refrigeration tube wall increases with the increase of the total solar radiation,and the average heat flux is-4.1--6.3 W/m^(2).Compared with ordinary embankment,refrigeration embankment can significantly improve the permafrost table of the embankment and restrain the temperature rise of permafrost.It can be found that the permafrost table of the embankment will increase with the increase of refrigeration tube length and tube wall heat flux,but it increases first and then decreases with the increase of the embedded depth of the refrigeration tube.The heating rate of ground temperature will decrease with the increase of refrigeration tube length,buried depth,and tube wall heat flux.Finally,based on the grey correlation analysis,it is found that the heat flux of the refrigeration tube wall has the most significant effect on the permafrost table of the embankment,followed by the length of the refrigeration tube,and the embedding depth is the least.The ground temperature rise rate is the most sensitive to the buried depth of the refrigeration pipe,followed by the tube heat flux,and the length of the refrigeration tube is the smallest.Therefore,it is suggested that more significant factors should be preferentially selected for regulation in design and construction.

关 键 词：多年冻土 制冷路基 光伏发电 压缩式制冷 冻土上限 

分 类 号：TU43[建筑科学—岩土工程]