地铁车站叠合墙内衬早龄期温度与应变演化规律

Early Age Temperature and Strain Evolution of Composite Wall Lining in Subway Station

为探究叠合墙早龄期内衬温度与应变演化规律,依托地铁车站叠合墙工程开展早龄期内衬墙温度与应变现场监测,分析内衬墙的裂缝分布特征、温度与应变演化规律。结果表明:在早龄期,裂缝多从内衬墙的底部施工缝向上延伸,大部分裂缝为竖向裂缝,少量斜裂缝位于墙角;内衬墙的中部温度高于四周温度,而墙体中心的温度峰值与降温速率最大,表面温度峰值最小,并且墙体存在明显的里表温差;在早龄期,内衬墙存在明显的膨胀与收缩现象,并且不同方向上的应变演化规律存在明显的区别。

In order to explore the early age temperature and strain evolution of the composite wall lining,on site monitoring of the temperature and strain of the early age lining wall is carried out based on the subway station composite wall project,and the crack distribution characteristics,temperature and strain evolution of the lining wall are analyzed.The results show that in the early age,most of the cracks extend upward from the bottom of the lining wall construction joint,most of the cracks are vertical,and a few oblique cracks locate at the corner of the wall.The temperature in the middle of the lining wall is higher than the surroundings,the temperature peak and the temperature drop rate in the center of the wall are the maximum,and the surface temperature peak is the minimum,the obvious temperature difference exists bettween the in inner and the surface.In the early age,there are obvious expansion and contraction phenomena in the lining wall,and obvious differences in the strain evolution in different directions.