Study on Deformation Rule of Pile-anchor Support Structure in Super-large Deep Foundation Pit
Taking a deep foundation pit project as an example,the paper analyzes the support design scheme of super deep foundation pit,and analyzes the changes of the horizontal displacement of pile top and the lower water level outside the foundation pit by using the field monitoring data.The practice shows that with the increase of excavation depth,the horizontal displacement of pile top gradually increases from a small am-plitude(<2 mm)in the initial stage to2～17 mm,which indicates that the excavation operation significantly changes the soil pressure distri-bution,resulting in a significant increase in pile top displacement.Therefore,the deformation monitoring of the central support system of foun-dation pit should be strengthened during construction.
Deep foundation pitPile-anchor supportHorizontal displacement of pile topDeformation rule
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