厚砂层地基中“桥建合一”桩基动力特性振动台试验研究  

Dynamic Characteristics of Dynamic Vibration Table for“Bridge Construction in One”Pile Foundation in Thick Sand Foundation

作　　者：杨涛[1] 文华[1] 孔超 YANG Tao;WEN Hua;KONG Chao(School of Civil Engineering and Architecture,Southwest University of Science and Technology,Mianyang,Sichuan 621010,China)

机构地区：[1]西南科技大学土木工程与建筑学院,四川绵阳621010

出　　处：《施工技术》2020年第17期61-64,88,共5页Construction Technology

基　　金：国家自然科学基金(51108393);四川省教育厅重点项目(162A0139);北京市科技计划项目(7110000211);西南科技大学创新基金项目(18ycx089)。

摘　　要：以"桥建合一"理念设计的高速铁路站房昆明南站工程中常用桩基结构为研究原型,依托大型振动台进行"桥建合一"桩-土-上部结构相互作用动力特性模型试验,选取0. 4g和0. 8g 2种不同震级的EI Centro波作为输入地震波,并通过监测整个模型结构不同位置的加速度、应变及液化砂土中孔隙水压力的变化情况,分析桩-土-上部结构在地震动作用下砂土孔压的变化情况、加速度的响应规律及结构峰值弯矩的分布特征,并提出相应建议用于实际工程。The pile foundation structure commonly used in Kunming South Station project which was designed with the concept of"bridge construction in one"was used as a prototype for research,relying on the large-scale shaking table to carry out the"bridge construction in one"pile-soil-superstructure interaction dynamic characteristic model test.This paper selects 0.4 g and 0.8 g EI Centro waves with different magnitudes as input seismic waves,and the entire model structure at different positions is monitored.The changes of acceleration,strain and pore water pressure in liquefied sand are analyzed.The change of sand pore pressure,the response law of acceleration and the distribution characteristics of peak bending moment of pile-soil-superstructure under ground motion are analyzed,and this paper puts forward corresponding suggestions for actual projects.

关 键 词：桩基 桥建合一 桩基动力 振动台试验 液化砂土 峰值弯矩 

分 类 号：TU435[建筑科学—岩土工程]