位移调节器用于端承型桩筏基础的模型试验研究

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摘要位移调节器是用于调节物体支承接触点之间位移的特殊装置，可用来保证端承型桩筏基础桩–土的变形协调和共同作用。为研究端承型桩筏基础中位移调节器的设置对桩–土–筏相互作用的影响，进行了位移调节器设置前后端承型桩筏基础的室内模型对比试验。试验测量了桩身轴力、筏板沉降及桩间土反力，分析了不同荷载级别下端承型桩筏基础的荷载传递规律、整体沉降与差异沉降分布特征以及桩土荷载分担比等内容，结果表明：与常规端承型桩筏基础相比，位移调节器的设置改变了桩筏基础的荷载传递规律，顺利实现了桩土的共同作用，同时适当支承刚度的调节器可优先且充分地发挥筏底土体承载能力，优化桩土荷载分担比。结论可为进一步理论研究提供试验依据。

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	周峰
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关键词 ：位移调节器, 端承型桩筏基础, 桩土共同作用, 荷载传递规律

Abstract：Settlement adjustor is a special device used to adjust the displacement between contact points of structures. The installation of the settlement adjustor can ensure the deformation coordination and the interaction for pile-soil of end-bearing piled raft foundation. In order to study the influence of the settlement adjustor on the interaction with pile-soil-raft of end-bearing piled raft foundation, laboratory model tests are performed before and after the installation of the settlement adjustor. The axial forces of pile ， the settlement of raft and the raft-soil contact pressure are measured. Then, the pile-soil load transfer mechanism, the settlement and difference settlement of raft and the pile-soil load sharing ratio of end-bearing piled raft foundation under different load levels are analyzed. The results show that, as compared with the conventional end-bearing piled raft foundation, the installation of the settlement adjustor has changed the load transfer rule of piled raft foundation and achieved the interaction of pile-soil. Suitable bearing stiffness of the settlement adjustor can give priority and full play to the bearing capacity of the soil beneath the raft and optimize the pile-soil load sharing ratio. The conclusions can provide the experimental basis for further theoretical researches.

Key words： settlement adjustor end-bearing piled raft foundation pile-soil interaction load transfer rule

收稿日期: 2011-01-06

TU470

基金资助:国家自然科学青年基金项目（ 51008159 ）；住房与城乡建设

作者简介: 周峰 (1979 – ) ，男，江苏阜宁人，博士，副教授，硕士生导师，主要从事桩土共同作用方面的理论研究与工程实践。

引用本文:

周峰, 郭亮, 刘壮志, 王旭东, 王继果. 位移调节器用于端承型桩筏基础的模型试验研究[J]. 岩土工程学报, 2012, 34(2): 373-378. ZHOU Feng, GUO Liang, LIU Zhuang-zhi, WANG Xu-dong, WANG Ji-guo. Model tests on end-bearing pile foundation by use of settlement adjustor. Chinese J. Geot. Eng., 2012, 34(2): 373-378.

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http://manu31.magtech.com.cn/Jwk_ytgcxb/CN/ 或 http://manu31.magtech.com.cn/Jwk_ytgcxb/CN/Y2012/V34/I2/373

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