地铁车站超深基坑围护结构变形监测结果分析

Analysis on Deformation Monitoring Results of Retaining Structure in Subway Extra-deep Foundation Pit

摘要:

依托上海地铁18号线杨高中路站超深基坑工程围护结构变形监测结果，从围护结构水平、垂直位移量，立柱桩垂直位移量等参数角度对超深基坑围护结构的变形规律进行探讨和总结。分析可知，随着基坑的分层开挖施工，围护结构水平位移曲线表现为“大肚状”形态，最大位移点不断下移，最终稳定在093～107倍开挖深度处，最大水平变形量约为开挖深度的330‰，平均最大隆起变形量约为开挖深度的052‰，立柱呈现隆起状态，隆起位移量约为开挖深度的091‰，与周边管线监测数据变形趋势基本一致，上述规律可为类似工程的设计和施工提供借鉴。

关键词:地铁车站;超深基坑;围护结构;变形监测

Abstract:

Based on the deformation monitoring results of the extra deep foundation pit at Yanggaozhong Road station of Shanghai subway line 18, the deformation regularity of the deep foundation pit retaining structure is discussed from the aspects of the horizontal & vertical displacements of the retaining structure and the vertical displacement of the column pile. The analysis shows that with the layered excavation of the foundation pit, the horizontal displacement curve of the retaining structure shows a “big belly” shape, the maximum displacement point constantly moving downward, and finally being stable at about (093～107) times the excavation depth; the maximum horizontal deformation is about 330‰ of the excavation depth; the everage maximum bulging deformation is about 052‰ of the excavation depth; the column is bulged with the displacement about 091‰ of the excavation depth. All the deformation is basically consistent with the deformation trend of monitoring data in peripheral pipelines, so the above-mentioned regularities are expected to be reference for the design and construction of similar projects in the future.

Key words:subway station; extra-deep foundation pit; retaining structure; deformation monitoring