（1 浙江大学软弱土与环境土工教育部重点实验室， 杭州 310058；2 浙江大学岩土工程研究所， 杭州 310058；   3 重庆交通大学河海学院， 重庆 400074； 4 河海大学港口海岸与近海工程学院， 南京 210098）

［摘要］重庆地区某拟建高层建筑地基土不均匀，主楼与裙房之间高度相差悬殊，传统桩基设计理念是采用端承嵌岩桩，但这易造成建筑产生超出规范限定的蝶形差异沉降，引起结构产生较大的次生应力。基于岩土体自身承载力以及地基土的性质来优化布桩方案，在基岩埋深较大的区域采用摩擦桩；  在基岩埋深浅的区域采用嵌岩桩。通过现场静载荷试验对桩基设计进行了验证。结果表明：调整桩基设计后，建筑差异沉降得到了有效改善，满足规范要求。

［关键词］高层建筑；  差异沉降；  岩土体自身承载力；  桩基设计

中图分类号：TU473-1文献标识码：A文章编号：1002-848X(2020)17-0121-05

Pile foundation design based on self-bearing capacity of rock and soil body

DONG Honghan1,2,4, LI Xinkai3, ZHUANG Ning4, ZHAO Songying4

(1 Key Laboratory of Soft Soils and Geoenvironmental Engineering of Ministry of Education, Zhejiang University, Hangzhou 310058, China; 2 Institute of Geotechnical Engineering, Zhejiang University, Hangzhou 310058, China；  3 College of River and Ocean Engineering, Chongqing Jiaotong University, Chongqing 400074, China；  4 College of Harbor, Coastal and Offshore Engineering, Hohai University, Nanjing 210098, China)

Abstract:The foundation soil of a proposed high-rise building in Chongqing is uneven, and the height difference between the main building and the podium of the building is very large. The traditional design idea of pile foundation was to adopt the end bearing rock- embedded piles, which was easily cause the different settlement of butterfly shape beyond the code limit, resulting in the larger secondary stress of the structure. Based on the self-bearing capacity of the rock and soil body and the properties of the foundation soil, the pile layout scheme was optimized. Friction piles were adopted in areas with large buried depth of base rock, and rock-embedded piles were adopted in areas with shallow buried depth of base rock. The design of the pile foundation was verified by field static load test. The results show that the differential settlement of the building has been effectively improved to meet the requirements of the code after adjusting the design of the pile foundation.

Keywords:high-rise building; differential settlement; self-bearing capacity of rock and soil body; pile foundation design

*江苏省水利科技项目（2017030）。

作者简介：董洪汉，博士研究生，Email:1037158873@qq.com;通信作者：庄宁，博士，副教授，Email:147510972@qq.com。