自适应位移调节下摩擦桩系列模型试验研究  

MODEL TEST ON FRICTION PILE SERIES WITH ADAPTIVE SETTLEMENT ADJUSTING

作　　者：郭亮[1] 周峰[2] 刘壮志[2] 李菁[2] 

机构地区：[1]南京大学地球科学与工程学院,江苏南京210093 [2]南京工业大学交通学院,江苏南京210009

出　　处：《岩石力学与工程学报》2011年第9期1896-1903,共8页Chinese Journal of Rock Mechanics and 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：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。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.

关 键 词：桩基工程 位移调节器 变刚度调平 桩土共同作用 

分 类 号：TU473[建筑科学—结构工程]