地铁车站施工期温度演化的试验研究

Experimental Research on the Temperature Change of Subway Station during Construction

研究目的:地铁车站施工工期长,技术复杂,温度值的采集难度大,国内外在地铁车站温度测试试验方面尚较缺乏。为给地铁车站温度及温度应力理论分析提供试验数据支持,对地铁车站进行温度跟踪测试与分析。研究结论:以上海某地铁车站两诱导缝间的施工段为温测对象,测得施工期各点的时程温度值。经温测数据统计分析得出:在浇筑初期,混凝土温度主要受水化温升与气温条件的影响,并以水化温升的影响为主,在浇筑的中后期,地铁车站的温度变化趋势与气温演化趋势基本一致,且底板与靠近诱导缝处的最大日温降高于其它部位,顶板、底板的最大内外温差高于内衬墙。基于试验数据分析,进一步在温度荷载定义与现场养护方面提出了建议。

Research purposes： As the construction period of subway station is long and the construction technology is complicated,it is difficult to collect full temperature values and there is a little test done on the temperature change of subway station.Therefore,it is necessary to do trace test on the temperature of subway station and make the analysis of the temperature so as to provide the data support to the temperature analysis of subway station in theory.Research conclusions：To the construction section between two induced joints of one subway station in Shanghai,the temporal temperature values of subway station were collected from the test on the different construction phase.From the statistics of the tested temperature,it was concluded that concrete temperature was affected mainly by the temperature rise of hydration and atmospheric temperature in early concrete casting stage.In medium and later concrete casting stages,the temperature change trend of subway station was basically consistent with the atmospheric temperature,and the max.day-temperature drop of the top plate and the place around induced joints was more than that of other parts and the max.day-temperature difference between outside and inside of top plate and bottom plate was more than that of the inside lining wall.Based on the analysis of the tested data,the proposals on the definition of temperature load and the in-site maintenance were made.