热管对沥青混凝土温变影响的仿真和试验研究
卜力平1,2,王家主3,4
1.福建船政交通职业学院土木工程学院,福建 福州 350007;
2.福建船政交通职业学院交通土建智能与绿色建造应用技术协同创新中心,福建 福州 350007;
3.福建省交通科研院有限公司,福建 福州 350004;
4.近海公路建设与养护新材料技术应用交通运输行业研发中心,福建 福州 350004
摘要:为研究冻土的稳定及路基保护问题,通过建立埋设热管的沥青混凝土光照模型,测试沥青混凝土内部不同深度处温度随光照时间的变化,利用热管在沥青混凝土中的传热降温作用,并通过有限元仿真模拟计算相同时刻相同点位的温度,得到实测温度与仿真温度的关系。结果表明:埋热管后沥青混凝土内部的温度场呈波浪形分布,仿真计算的内部点温度随时间变化曲线与实测温度曲线接近,内部点位越深,光照时间越短,二者的差值越小。
关键词:热管;沥青混凝土;温度场;有限元仿真;工况
Simulation and experimental study on the influence of
heat pipe on temperature change of asphalt concrete
BU Liping1,2,WANG Jiazhu3,4
1. College of Civil Engineering, Fujian Chuanzheng Communications College, Fuzhou 350007 ,China;
2. Collaborative Innovation Center of Intelligent and Green Construction Application Technology of Transportation Civil Construction,Fuzhou 350007 ,China;
3.Fujian Provincial Transportation Research Institute Co., Ltd., Fuzhou 350004, China;
4.Research and Development Center of Transport Industry of New Materials, Technologies Application for Highway Constructionand Maintenance of Offshore Areas, Ministry of Transport, PRC, Fuzhou 350004, China
Abstract:In order to study the stability of frozen soil and the protection of subgrade, a light model of asphalt concrete with embedded heat pipe is established. Based on the model which comprised asphalt concrete imbedded with heat pipes and infrared lamp as heat producer, temperature variations versus illumination time in different depths of asphalt concrete were measured. Compared with those values under the same condition obtained by finite element simulation, the relation between these two values shows that, the temperature field of asphalt concrete was wavy, and the temperature time curve of the simulation is close to that of actual situation. The deeper the testing point and the less the illumination time is, the smaller the difference between them is.
Keywords:heat pipe; asphalt concrete; temperature field; finite element simulation; engineering condition