半空间地基中虚土桩模型的精度分析及应用  

Accuracy and Application of Virtual Soil Pile Model in Half Space Foundation

作　　者：吴文兵[1,2] 王奎华[1] 张智卿[3] 陈嘉熹[1] 

机构地区：[1]浙江大学软弱土与环境土工教育部重点实验室,浙江杭州310058 [2]中国地质大学(武汉)工程学院,湖北武汉430074 [3]浙江树人大学城建学院,浙江杭州310015

出　　处：《应用基础与工程科学学报》2012年第1期121-129,共9页Journal of Basic Science and Engineering

基　　金：国家自然科学基金面上项目(50879077);浙江省建设科研项目(ZC201042)

摘　　要：对虚土桩模型求解半空间地基上刚性圆板垂直振动特性的精度及应用进行研究.首先将刚性圆板正下方直到基岩的圆柱形土体看作虚土桩,通过求解桩土耦合振动,得到了简谐荷载作用时刚性圆板下均质滞回材料阻尼土体振动位移解,进一步利用该解,根据桩土接触面的边界条件来考虑桩土耦合作用,求解虚土桩的动力平衡方程,进而得到了桩土体系的定解.然后将虚土桩模型得到的刚性圆板的动力特性与现有精确解进行对比分析,结果表明本文解与现有精确解较吻合,具有足够高的精度.最后讨论了主要参数对虚土桩顶复刚度的影响.The accuracy and application of virtual soil pile model was investigated analyze the vertical vibration response of hysteretic type damping homogenous by using it to soil under rigid circular plate. Assuming cylindrical soil column between rigid circular plate and base rock to be virtual soil pile, the vibration modes of the soil layer were derived and used to analyze the pile response. Considering the interaction between the soil layer and the pile with boundary condition and equilibrium equation, the dynamic equilibrium equation of pile was solved and the solution of soil-pile system was obtained. Comparing the results in the paper with existing achievements, it was showed that these article solutions were conformed to existing results and the accuracy of the virtual soil pile model was sufficient. Through numerical calculation, the influence of main parameters of the solutions was analyzed.

关 键 词：虚土桩模型 半空间地基 刚性圆板 简谐荷载 复刚度 

分 类 号：TU435[建筑科学—岩土工程]