自适应位移调节下摩擦桩系列模型试验研究

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摘要为深入研究设置位移调节器后桩筏基础桩土共同作用机制及变刚度调平效果，通过2组室内模型试验，对比分析摩擦型单、群桩在常规工况及位移调节下的工作性状。试验结果表明：(1) 单桩试验中位移调节器明显改变荷载传递规律，优先并充分发挥筏底土体承载能力，优化桩土荷载分担比，但是桩顶以下一定范围内存在负摩阻力；(2) 摩擦型群桩试验中使用位移调节器，可优化桩基支承刚度，充分发挥地基土承载力的同时顺利实现桩筏基础的变刚度调平，有效减小筏板差异沉降。试验成果可为进一步的理论研究提供试验依据。

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关键词 ：桩基工程, 位移调节器, 变刚度调平, 桩土共同作用

Abstract：In order to study the mechanism of pile-soil interaction and the effect of variable rigidity design after the settlement adjustor is installed，two sets of comparative model tests are carried out to analyze the behaviors of frictional single pile and pile groups under conventional condition and settlement adjusting. The analytical results show as follows：(1) The application of settlement adjustor in single pile can obviously change the load transfer rule，give top priority to soil beneath the raft and its bearing capacity can be well developed；and the load bearing ratio of pile to soil is optimized. However，it is found that negative friction resistance distributes in a certain range below pile top. (2) By use of the settlement adjustor in friction pile group foundations，the supporting stiffness of pile foundation can be optimized. The variable rigidity design of pile raft foundation is realized successfully when the bearing capacity of foundation soil is well developed，which effectively reduces the differential settlement of pile raft. The conclusions can provide the experimental basis for further theoretical research.

Key words： pile foundations settlement adjustor variable rigidity design pile-soil interaction

收稿日期: 2011-04-15

引用本文:

郭亮1，周峰2，刘壮志2，李菁2. 自适应位移调节下摩擦桩系列模型试验研究[J]. 岩石力学与工程学报, 2011, 30(9): 1896-1903.
GUO Liang1，ZHOU Feng2，LIU Zhuangzhi2，LI Jing2. MODEL TEST ON FRICTION PILE SERIES WITH ADAPTIVE SETTLEMENT ADJUSTING. , 2011, 30(9): 1896-1903.

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http://www.rockmech.org/CN/Y2011/V30/I9/1896

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