Research on key problems of geotechnical engineering and settlement control of super-high-rise buildings in soft soil area
Drawing on the Shanghai Tower as a case study,this article delves into critical geotechnical considerations for super-high-rise buildings constructed on soft soil,encompassing pile type selection,bearing capacity calculation,settlement calculation,and more.Given the substantial loads exerted by super-high-rise structures,pile bearing capacity assumes paramount importance.The selection of pile types necessitates a thorough evaluation,weighing factors such as environmental conditions,load-bearing requirements,and construction feasibility.In soft-soil regions,large-diameter and super-long bored piles with delayed-grouting emerge as the preferred choice.Given the stringent settlement requirements for super-high-rise buildings,settlement calculations demand meticulous attention,encompassing variables such as strata conditions,structural attributes,load distribution,and environmental factors.By adopting several different methods,the calculated value of settlement of the tower ranges from 75 to 120mm,while the measured value is around 100mm.Comparatively,predictions from finite element method(FEM)exhibit greater alignment with measured values,the settlement at the period of structural capping accounted for about 90%of the total settlement,and the foundation settlement mainly occurred during the construction.
soft soil areasuper-high-rise buildingsgeotechnical engineeringfoundation constructiondeep foundation pit engineeringlarge diameter super long cast-in-place pilepost-groutingsettlement control
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