高层建筑基础浅埋的整体性分析

Whole analysis for the tall building′s shallow foundation

结合深圳前海地铁上盖物业高层建筑因地下地铁轨道线的原因而不能设置地下室,只能采用基础浅埋的工程实例,提出了在不满足《建筑地基基础设计规范》5.1.3条和《高层建筑混凝土结构技术规程》12.1.7条:桩箱和桩筏基础的埋置深度不宜小于建筑物高度的1/18～1/20规定的情况下,对高层建筑在地震作用和水平风荷载作用下的整体倾覆分析、基础底面的零应力区分析、桩的竖向和水平承载力分析、大震弹性反应谱作用下桩的抗拔分析分别进行验算和采取有效的构造措施,来加强基础的刚度,保证建筑基础满足地基承载力、稳定性、基础底面的零应力区控制和大震作用下桩抗拔的要求,就可对规范的限制放松,在场地受限的情况下,也可采用浅埋基础的设计方案。其设计可供同类工程参考。

Due to the existence of underground subway,basement cannot be designed for the tall building above the subway,thus shallow foundation is adopted.This paper performs some discussions on this issue.If the depth of foundation exceeds the limit value specified by the item 5.13 of 'Code for design of building foundation'and item 12.1.7 of 'Technical specification for concrete structures of tall building',this paper suggests that the code requirements can be released by analyzing the overturning of tall building under the wind or seismic loads,the foundation′s zero-stress area,the pile′s vertical and level bearing capacity and the pile′s capacity to resist pulling force due to major earthquakes function and adopting some reasonable measures strengthen the foundation′s stiffness.This study can provide references to similar projects.