地下变电站温度裂缝发展分析与控制

发布时间：2019-04-15 21:27

【摘要】：在地下水位高的地区,地下变电站对裂缝控制的要求十分严格。由于存在与地面结构不同的边界约束条件、环境温度与施工过程,对其温度裂缝的研究十分必要。针对上海220 k V济南变电站工程项目,通过MIDAS软件对该剪力墙结构的每一施工工况进行数值模拟,研究温度裂缝的空间分布与随时间的发展变化。结果表明,裂缝主要发生在结构剪力墙纵横墙与楼板等约束较强的交汇处,在浇筑一周后形成,两周内趋于稳定,后续工况中新浇筑的楼层对前工况中楼层的裂缝影响较小,仅存在轻微闭合或扩张。基础底板在浇筑完的第25天内部产生裂缝,在第37天部分内部裂缝连通,基础表面的裂缝形成于基础与墙体的接触处。针对不同的位置与发展程度的温度裂缝,提出相应的措施。
[Abstract]:In the area with high groundwater level, the requirements of crack control in underground substations are very strict. It is necessary to study the temperature crack due to the different boundary constraint conditions between the ground structure and the environment temperature and construction process. Aiming at the project of Shanghai 220kV Jinan substation, the spatial distribution of temperature crack and its development with time are studied by numerical simulation of each construction condition of the shear wall structure by MIDAS software. The results show that the cracks mainly occur at the intersection of shear wall and floor, which are formed one week after pouring and tend to be stable in two weeks. The newly-poured floors in subsequent working conditions have little effect on the cracks in the front working conditions. There is only slight closure or expansion. The cracks in the foundation floor are formed in the 25th day after pouring and the cracks in the 37th day are connected. The cracks on the foundation surface are formed in the contact between the foundation and the wall. According to the temperature crack of different position and development degree, the corresponding measures are put forward.
【作者单位】：上海电力设计院有限公司;同济大学地下建筑与工程系;
【基金】：国家电网公司科技项目(5150011044)
【分类号】：TU93

【参考文献】