位移调节器用于端承型桩筏基础的模型试验研究  

Model tests on end-bearing pile foundation by use of settlement adjustor

作　　者：周峰[1,2] 郭亮[1] 刘壮志[1] 王旭东[1] 王继果[2] 

机构地区：[1]南京工业大学交通学院,江苏南京210009 [2]三江学院土木工程学院,江苏南京210012

出　　处：《岩土工程学报》2012年第2期373-378,共6页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学青年基金项目(51008159);住房与城乡建设部研究开发项目(2010-K3-4)

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。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 aiter the installation of the settlement adjustor. The axial forces of pile, the settlement of rafl 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.

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 

分 类 号：TU470[建筑科学—结构工程]