层状非饱和土中端承桩竖向土体振动响应研究  

Research on the Vertical Vibration Response of the Soil Mass of End-Bearing Piles in Layered Unsaturated Soil

作　　者：孟建文 严福 李文成 MENG Jianwen;YAN Fu;LI Wencheng(Wuwei Vocational College;Liangzhou District Bureau of Housing and Urban-Rural Development;Gansu Wujian Engineering Construction Co.,Ltd.,Wuwei,Gansu Province,733000 China)

机构地区：[1]武威职业学院 [2]凉州区住房和城乡建设局 [3]甘肃武建工程建设有限公司,甘肃武威733000

出　　处：《科技资讯》2024年第12期97-99,共3页Science & Technology Information

基　　金：武威市2023年第三批市级科技计划项目“振动荷载下土壤动力学传递特性共性研究”(项目编号:WW23A03RPZ004)。

摘　　要：目的 研究层状非饱和土中端承桩竖向土体振动响应。方法 分别制作一个层状非饱和土的模型箱与端承桩的模型桩,分析层状非饱和土中端承桩竖向土体振动响应。结果 随着非饱和土饱和度的增加,端承桩桩顶的位移频响逐渐增大、动刚度频响逐渐减小、动阻尼比频响逐渐增大;随着层状土上下土层厚度比的减小,端承桩桩顶的位移频响逐渐增大、动刚度频响逐渐减小、动阻尼比频响逐渐增大。结论 层状非饱和土的饱和度越小、上下土层厚度比越大,越有利于降低端承桩竖向土体振动响应。Objective To study the vertical vibration response of the soil mass of end-bearing piles in layered un-saturated soil.Method A model box of layered unsaturated soil and a model pile of the end-bearing pile were made respectively to analyze the vertical vibration response of the soil mall of end-bearing piles in layered unsatu-rated soil.Result With the increase of the saturation of unsaturated soil,the frequency response of the displacement of the end-bearing pile top gradually increased,the frequency response of its dynamic stiffness gradually decreased,and the frequency response of its dynamic damping ratio gradually increased;with the decrease of the thickness ra-tio of the upper and lower soil layers of layered soil,the frequency response of the displacement of the end-bearing pile top gradually increased,the frequency response of its dynamic stiffness gradually decreased,and the frequency response of its dynamic damping ratio gradually increased.Conclusion The lower the saturation of layered unsatu-rated soil and the greater the thickness ratio of its upper and lower soil layers,the more conducive it is to reducing the vertical vibration response of the soil mass of end-bearing piles.

关 键 词：层状非饱和土 端承桩 竖向振动 振动响应 

分 类 号：TU470[建筑科学—结构工程]