分布荷载作用下部分埋入群桩的水平振动研究  

Study on horizontal vibration of partially embedded pile groups under distributed load

作　　者：程镇 任青[1] 吕洪勇 颜超 

机构地区：[1]上海理工大学环境与建筑学院,上海200093 [2]上海金盛隆置地有限公司,上海201602 [3]上海市基础工程集团有限公司,上海200433

出　　处：《水资源与水工程学报》2017年第4期216-222,共7页Journal of Water Resources and Water Engineering

基　　金：国家自然科学基金青年基金项目(51008194)

摘　　要：首先将成层地基中的部分埋入桩看作成Winkler地基上的梁,采用传递矩阵法来考虑土体的分层情况,推导出水平分布荷载作用下部分埋入单桩振动公式;然后在被动桩和周围土体相互作用的基础上建立了部分埋入桩的桩-桩相互作用模型,通过讨论参数埋入比L1/L2、桩间距s/d和θ角对桩-桩相互作用因子的影响,得到了部分埋入群桩的动力特性模型,并计算解得群桩的桩身变形以及内力;结果验证了这些因素对于部分埋入群桩中桩-桩相互作用因子有很大影响,并且在浅层土中时能量大部分被土体释放,说明表层土对桩的约束起主要作用,为工程设计提供了依据。Firstly, the calculation model of the partially embedded single pile was deduced based on dynamic Winkler model and transfer-matrix formulation in case of multi-layered soils;and then the pile-pile interactionmodel models were constructed by assuming interactions between the receiving pile and the surrounding soil.By discussing the parameters of embedment ratio L1/L2,pile spacing s/d and angle θ, the calculation model and internal forces solving method of the partially embedded pile groups were obtained based on the pile-pile interactions model.The result shows that those factors have remarkable effects on pile-pile interaction factors of partially embedded pile groups, and most of the energy was released by the soil in the shallow soil.Our results indicate that the surface soil plays a major role in the restraint of the pile, and the conclusion can provide some basis for engineering design.

关 键 词：部分埋入群桩 水平分布动荷载 WINKLER地基 传递矩阵法 

分 类 号：TU473.1[建筑科学—结构工程]