依据对桩筏基础设计参数的研究成果，给出桩筏基础优化步骤和算例的验证情况。

Based on the present results of the design factors to piled raft foundation, the optimum design steps are given and verified by an example.

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本文分析结果表明，影响长短桩复合地基性状的因素很多，因此，应具体分析工程中遇到的实际地基处理问题，进行优化设计，以达到经济合理的目的。

So it is suggested that ground improvement methods for the actual project should be analyzed carefully and the optional design should be conducted for the purpose of economy and reasonability.

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建立了PC C桩复合地基优化设计的目标控制函数和两个约束条件：沉降控制条件和承载力校核条件。

The governing object function and two boundary condition: settlement and foundation bearing capacity are developed in the optimization design of the PCC pile composite foundation.

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