软土地铁车站结构的振动台模型试验

Shaking table test on metro station structures in soft soil

对地下铁道开展建立抗震设计方法的研究正逐渐得到人们的关注。通过对地铁车站结构进行振动台模型试验 ,深入了解软土地铁结构动力反应的规律 ,以便为检验理论计算结果的正确性提供验证 ,并为改进计算模型和分析方法 ,进而制定软土地铁抗震设计指南等提供依据。利用振动台对地铁车站结构进行模型试验在国内尚属首次 ,试验工作的开展遇到许多困难 ,如模型箱的形式、模型土的配制方法及其动力特性、相似关系比的确定、传感器类型的选择与布置等。针对这些困难逐一开展了研究 ,并都提出了解决方法 。

More and more attention has been paid to the development of seismic design method for metro structures. This paper aims at doing station structure model testing by shaking table in order to fully understand the law of its dynamic response in soft soil and examine the theoretical analysis result. It is also the basic support for developing the computing model and analysis method, and compiling the guide of metro seismic design. Because it is the first time to take station structure model testing by large scale shaking table in China, many difficulties are encountered during testing, such as shape of model box, model soil preparation ways and its dynamic property, determination of similarity ratio, type selection and arrangement of sensors. Researches have been carried out in sequence and solutions have been given in this paper. The testing result indicates that the testing method is effective in this paper.