［摘要］结合实际设计案例，针对浙江地区某工程场地内三种力学特性差异明显的中风化粉砂岩持力层，初步设计阶段按理论公式设计了不同桩长、不同持力层和入岩深度的试桩方案，通过试桩情况和静载试验结果，分析了不同中风化持力层下单桩承载力的特点，比较了静载试验与理论公式计算结果的差异，最终在施工图阶段优化了桩基设计方案。
［关键词］持力层；静载试验；单桩承载力；优化设计
中图分类号：TU473.1文献标识码：A文章编号：1002-848X(2011)10-0089-03
Optimal design of pile bearing capacity in complex pile bearing layers
Zhou Xiaoyue, Zhang Xuefeng(Architectural and Planning Design & Research Institute Co., Ltd. of Zhejiang University of Technology, Hangzhou 310014, China)
Abstract:Based on an actual case with three significant different medium weathered siltstone pile bearing layers on a construction site in Zhejiang, three pile testing programs for different length of pile, different pile bearing layers and the status of rocksocketed piles based on theoretical formula during the preliminary design stage were designed. Based on actual construction of pile testing and the results of three static load tests, the characteristics of pile bearing capacity in  different medium weathered siltstone pile bearing layers were analyzed. The results of theoretical formula and static load tests were compared, then the design of piles was optimized.
Keywords:bearing layer; static load test; bearing capacity of single pile; optimal design
*浙江省住房和城乡建设厅［2010］166号资助项目（项目编号：1012）。
作者简介：周晓悦，高级工程师，Email：zhouxy_hz@163.com。
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