可控刚度桩筏基础桩土共同作用的工程实践

doi:10.13722/j.cnki.jrme.2017.0247

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摘要端承型桩等支承刚度较大的桩基础，在正常工作荷载作用下，桩顶较小的竖向变形无法保证桩土共同作用的实现，这可能导致良好的天然地基承载力得不到充分利用，造成极大的浪费。介绍的典型工程成功解决了支承刚度较大的桩基础难以实现桩土共同作用的问题，同时还实现了桩筏基础的变刚度调平，通过对工程设计及数值分析过程的详细论述与描写，并将现场测试数据与分析结果进行对比分析，验证可控刚度桩筏基础应用于该项目的合理性与可靠性。数值分析及现场实测结果显示，本工程采用可控刚度桩筏基础后，建筑物总沉降和差异沉降均满足设计要求，地基土分担了上部结构63%的的荷载，桩基数量大幅度降低，减少了高能耗建材的使用和桩基施工对周边环境的影响，取得了显著的经济效益和社会效益。本工程可控刚度桩筏基础实施所取得的相关经验与成果可供类似工程借鉴与参考。

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	周峰1
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	朱锐1
	郭天祥3
	翟德志1

关键词 ：基础工程, 端承桩, 刚度调节装置, 可控刚度, 桩土共同作用, 变刚度调平

Abstract：Because the end-bearing pile has a large supporting stiffness，a small vertical deformation under the normal working load on the top of the pile will not activate the pile-soil interaction. As a result，the natural bearing capacity of foundation soil is not fully utilized. The typical project presented in this paper successfully solved the problem of pile-soil interaction of pile foundation with large supporting stiffness，and also optimized the stiffness distribution in the piled raft system. The process of the design and numerical analysis are described in detail. The field test data and analytic results were compared and analyzed to verify the rationality and reliability of the piled raft foundation applied with controllable stiffness. The results of numerical analysis and field test show that the total settlement and differential settlement of the building meet the design requirements after adopting the piled raft foundation with controllable stiffness. The foundation soil bore 63% of the superstructure load and the number of the piles significantly is reduced.

Key words： pile foundation end-bearing piles stiffness adjustor controllable stiffness pile-soil interaction variable rigidity design

引用本文:

周峰1，2，朱锐1，郭天祥3，翟德志1. 可控刚度桩筏基础桩土共同作用的工程实践[J]. 岩石力学与工程学报, 2017, 36(12): 3075-3084.
ZHOU Feng1，2，ZHU Rui1，GUO Tianxiang3，ZHAI Dezhi1. Engineering practice in pile-soil interaction of pile-raft foundations with controllable stiffness. , 2017, 36(12): 3075-3084.

链接本文:

http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2017.0247 或 http://www.rockmech.org/CN/Y2017/V36/I12/3075

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