湖中超大围堰降水及开挖阶段变形特性研究

Study on Deformation Characteristics of Oversized Cofferdam in Lake During Precipitation and Excavation Stages

为探究PC工法桩超大围堰在堰内抽水以及基坑开挖过程中变形规律,依托金鸡湖湖内PC工法桩超大围堰工程实例,运用MIDASGTS/NX数值模拟软件,从水平位移、竖向位移两个方面系统研究分析了PC组合工法桩围堰在堰内抽水和基坑开挖施工全过程中的变形规律,并与现场监测数据进行对比。结果表明,随着堰内抽水及放坡开挖的不断进行,围堰前后排桩的顶部水平位移和竖向位移逐渐增大;施工结束后,围堰桩顶水平位移最大值和桩顶竖向位移最大值分别为39.17 mm和16.1 mm,均远小于130 mm的预警控制标准,围堰支护效果良好,围堰安全稳定。

In order to investigate the deformation law of the PC method pile ovensized cofferdam during the pumping and excavation of the foundation pit,the article relied on the example of the PC method pile oversized cofferdam project in Jinji Lake and used MIDAS GTS/NX numerical simulation software to systematically study and analyse the deformation law of the PC combined method pile cofferdam during the pumping and excavation of the foundation pit from two aspects;horizontal displacement and vertical displacement,and compared it with the on-site monitoring data.The results showed that with the continuous pumping and slope excavation,the horizontal and vertical displacements of the top row of piles at the front and rear of the cofferdam gradually increased;at the end of the construction,the maximum horizontal and vertical displacements of the top of the piles of the cofferdam were 39.17 mm and 16.1 mm respectively,both of which were far less than the warming control standard of 130mm,and the cofferdam was well supported and safe and stable.