郑州市地铁车站基坑施工变形特性分析研究

Study on Analysis of Construction Deformation Characteristics of Subway Station Foundation in Zhengzhou City

采用FLAC3D数值模拟软件,结合郑州市某地铁车站基坑工程实际,考虑基坑的实际施工开挖步序,对地铁站基坑工程钻孔灌柱桩与钢支撑支护体系下开挖过程中的变形特性进行了数值模拟,得到了基坑开挖至不同深度时的变形场。根据变形场结果分析得出了基坑各位置变形特征及最大水平、沉降变形量。通过对比分析发现数值模拟结果与前期现场监测结果基本吻合。计算结果表明钻孔灌柱桩与钢支撑结构设计参数能够满足施工要求。

Based on the subway station foundation engineering in Zhenzhou, considering the actual construction excavation pit step sequence, the deformation characteristics of the subway station deep foundation using bored pile and steel support in the process of excavation is simulated by the FLAC- 3D numerical simulation software. The deformation field on the different excavation depth of the foun dation is obtained. According to the analysis results, the deformation characteristics of each position in the foundation, the maximal horizontal displacement and maximal settlement is obtained. It is found that the simulation results are consistent with preliminary field monitoring data by comparing a- nalysis. The simulation results show that the design parameters of bored pile and steel support struc- ture can meet the construction requirements.