| 复杂环境中大规模桩筏基础的优化设计方法研究 |
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| 引用本文： | 谢芸菲,迟世春,周雄雄.复杂环境中大规模桩筏基础的优化设计方法研究[J].岩土力学,2019,40(Z1):486-493. |
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| 作者姓名： | 谢芸菲 迟世春 周雄雄 |
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| 作者单位： | 1. 大连理工大学 海岸和近海工程国家重点实验室，辽宁 大连 116024；
2. 大连理工大学 建设工程学部水利工程学院工程抗震研究所，辽宁 大连 116024 |
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| 基金项目： | 国家重点研发计划（No.2016YFB0201001）。 |
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| 摘 要： | 变刚度优化设计对于复杂环境中的大规模桩筏基础始终是一个重要难题。基于有限元分析提出一种两阶段优化设计方法，该方法首先根据传统均匀布桩方案的桩顶应力分布对群桩进行分区，然后依据每个子区域桩顶应力之间的关系确定基桩数量调整系数，最后通过调整桩间距来改变各子区域的基桩数量，从而实现变刚度优化设计。运用该方法对多层土体中承担非均匀上部结构荷载的大规模桩筏基础进行变刚度优化设计，计算结果表明优化设计后筏板的差异沉降、平均整体弯矩和群桩顶部的差异应力均显著降低。该方法计算简单，应用范围广，且不受复杂土层条件、非均匀上部结构荷载以及桩基础规模大小形状的限制。
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| 关 键 词： | 变刚度优化设计 改变桩间距 大规模桩筏基础 复杂土层 非均匀荷载 |
| 收稿时间： | 2019-04-09 |
Research on optimization design method of large-scale pile-raft foundation in complex environment |
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| XIE Yun-fei,CHI Shi-chun,ZHOU Xiong-xiong.Research on optimization design method of large-scale pile-raft foundation in complex environment[J].Rock and Soil Mechanics,2019,40(Z1):486-493. |
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| Authors: | XIE Yun-fei CHI Shi-chun ZHOU Xiong-xiong |
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| Institution: | 1. State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian, Liaoning 116024, China;
2. Institute of Earthquake Engineering, Faculty of Infrastructure Engineering, Dalian University of Technology, Dalian, Liaoning 116024, China |
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| Abstract: | Variable stiffness optimization design is always an important and difficult problem for large-scale pile-raft foundations in complex environments. In this article, a two-stage optimization method was developed using finite element analysis, According to the stress distribution on top of piles in the traditional design with uniform pile arrangement, the pile groups are divided into several sub-groups firstly. Then the adjustment coefficient of the number of piles is determined according to the relationships among the pile top stresses of every sub-group. Finally, by adjusting the spacing of piles to change the number of piles in each sub-group, the variable stiffness optimization design can be realized. This procedure is used to optimize the large-scale piled raft foundations with non-uniform superstructure loads in multi-layer soils. The results show that after optimal design, the differential settlement of the raft, the average overall bending moment and the differential stress at the top of the pile are significantly reduced. The method is simple in calculation and wide in application, and is not limited by complex soil conditions, non-uniform superstructure loads and the size and shape of the pile foundation. |
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| Keywords: | variable stiffness optimization design change pile spacing large-scale pile-raft foundation complex soil layer non-uniform loads |
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