(大连市建筑设计研究院有限公司, 大连 116021)

［摘要］结合实际工程城市经纬超高层结构的桩-岩（土）复合地基基础设计，提出了利用桩顶预留沉降间隙来提高桩-岩（土）复合地基中岩（土）利用率的技术。采用有限元分析软件ABAQUS对此工程建立了上部结构-基础-地基整体三维有限元模型，通过选择合理参数及取值，并考虑上部结构刚度和施工模拟分层加载的影响对此工程进行了模拟分析。通过模拟分析，确定了最优桩顶预留沉降间隙量和桩-岩（土）分担荷载比例（约为0.2∶1），充分利用强风化板岩较高的承载力，减少了桩用量，缩短了施工工期。

［关键词］超高层结构； 桩顶预留间隙； 桩-岩（土）复合地基； 上部结构-基础-地基三维有限元模型； 桩-岩（土）分担荷载比例

中图分类号：TU473.1文献标识码：A文章编号：1002-848X(2016)02-0059-06

Pile-rock(soil) composite foundation technology of improving base rock(soil)

utilization rate by reserving pile-top settlement clearance

Wang Lichang, Qiu Xuguang, Li Zhihui, Zuo Qinglin, Liu Nan

(Dalian Institute of Architectural Design Co., Ltd., Dalian 116021, China)

Abstract:Combining with the pile-rock(soil) composite foundation design of an actual Atlas of Cities super high-rise structure project, the pile-rock (soil) composite foundation technology of improving the rock (soil) utilization rate by reserving pile-top settlement clearance was proposed. The general finite element analysis software ABAQUS was used to set up the overall three-dimensional finite element model of superstructure-foundation-base. Simulation analysis was carried out on the project through reasonable parameter and corresponding value selection as well as considering superstructure stiffness and effect of layer-by-layer loading in construction simulation. Through simulation analysis, the optimal reserved pile-top settlement clearance and pile-rock(soil) bearing load ratio (about 0.2∶1) were determined. And the high carrying capacity of highly weathered soil was taken advantage of to reduce the amount of foundation piles and shorten the construction period.

Keywords:super high-rise structure; reserved pile-top clearance; pile-rock (soil) composite foundation; three-dimensional finite element model of superstructure-foundation-base; pile-rock (soil) bearing load ratio

作者简介：王立长，教授级高级工程师，Email：wang19490621@sina.com。