大型深基坑逆作法施工对围护桩的影响研究

Study on Effect of Inverse Construction on Retaining Piles for Large and Deep Foundation Pit

为了分析开挖工法对支护结构的影响,得到深基坑围护桩在不同开挖步序下的变形规律与受力特性,运用数值分析手段模拟重庆市轨道交通六号线一期工程江北城站的基坑开挖过程,基坑开挖为大型深基坑逆作法开挖.得到的计算值与工程实测值基本吻合,验证了数值方法的正确性,评估了深基坑支护结构设计和施工方案的可行性.研究结论可为类似工程的施工与设计提供参考.

To analyze the influence of excavation method on the supporting structure,the deformation law and loading characteristics of deep foundation pit retaining pile under the different excavation step sequences are given.The numerical analysis means are adopted to simulate the excavation process of foundation pit for Jiangbei City Station of Chongqing Metro Line VI.The excavation of foundation pit is an inverse construction method for large and deep foundation pit The given calculation values is basically identical with the measured values of the project.The validity of the numerical method is verified.The feasibilities of design and construction schemes of deep foundation pit supporting structures are evaluated.The research conclusion can provide the reference for the design and construction of the similar projects.