桩网结构模型试验柔性拱研究

Study of flexible arch of model test in column-net structure

基于E.Buckinghamπ定理,应用因次分析方法,对桩网结构模型进行了相似理论推导,求解了模型与原型之间的相似关系,并基于所得的相似关系,结合现场工程实践对桩网结构模型进行了设计与制作。模型试验结果表明,(1)应用因次分析方法推求模型与原型之间的相似关系是可行的;(2)桩网结构柔性拱的沉降波形呈"网兜"状;(3)土工格栅应变随着路基填筑的增高与循环加载次数的增加而增大,土拱形成前格栅应变增大较快,土拱形成后应变增长变得缓慢。

In order to solve the similarity relation between the model and the prototype, based on the theorem of E.Buckingham π, the dimensional analysis method is used. Using deduced similarity relation, the model test of column-net structure is carried out for the design and the manufacture with the field engineering practice. Model test results show that it is feasible for using the dimensional analysis method to deduce the similarity relation between the model and the prototype. The settlement curve of flexible arch likes the shape of net sling. The strain of geogrid increases with the structure heightening and cyclic loading time increasing; and it increases more quickly before the formation of soil arch than after ones.