砂土液化过程中桩—土动力相互作用p-y曲线特性  

p-y curve characteristics of dynamic pile-soil interaction during sand liquefaction

作　　者：张征 唐亮[1,2] 凌贤长 司盼[1,2] 田爽 丛晟亦[1,2] ZHANG Zheng;TANG Liang;LING Xianzhang;SI Pan;TIAN Shuang;CONG Shengyi(School of Civil Engineering,Harbin Institute of Technology,Harbin 150090,China;Heilongjiang Research Center for Rail Transit Engineering in Cold Regions,Harbin 150090,China;School of Civil Engineering,Qingdao University of Technology,Qingdao 266033,China)

机构地区：[1]哈尔滨工业大学土木工程学院,黑龙江哈尔滨150090 [2]黑龙江省寒区轨道交通工程技术研究中心,黑龙江哈尔滨150090 [3]青岛理工大学土木工程学院,山东青岛266033

出　　处：《哈尔滨工程大学学报》2022年第10期1433-1439,共7页Journal of Harbin Engineering University

基　　金：国家重点研发计划(2016YFE0205100);国家自然科学基金项目(51578195,51608533);黑龙江省应用技术研究与开发计划(GA19A501)。

摘　　要：为了探究液化过程中桩-土-结构动力相互作用规律,本文基于正弦波加载完成桩-土-结构相互作用振动台试验,建立了液化场地桩-土动力相互作用p-y曲线,阐述了液化过程中桩-土动力相互作用p-y曲线特性。结果表明:高频正弦波加载,砂层孔压增长迅速;砂土液化过程中,桩弯矩表现为先增后减的趋势。动力p-y曲线滞回圈在低频加载情况下未软化,在高频加载情况下,动力p-y曲线滞回圈面积增大,且桩侧土反力增加。场地液化后动力p-y曲线呈现出上“凹”形状。本文研究成果可为液化场地桩基设计和工程建设提供参考。In order to study the pile-soil dynamic interaction in the process of soil liquefaction, the shake-table test of pile-soil structure interaction was completed based on sine wave loading, in which the p-y curve of pile-soil dynamic interaction was established and the p-y curve characteristics of pile-soil dynamic interaction in the soil liquefaction process were described. Results show that the pore pressure of the sand layer increases rapidly under high-frequency sine wave loading;in the process of sand liquefaction, the bending moment of the pile increases and then decreases. Under low-frequency loading, the hysteresis loop of the dynamic p-y curve of sand does not soften;under high-frequency loading, the area of the hysteresis loop of the dynamic p-y curve increases, and the reaction force of pile side soil increases. The dynamic p-y curve of liquefied sand is concave. The research results can provide a reference for pile foundation design and engineering construction in liquefaction sites.

关 键 词：液化场地 正弦波 动力p-y曲线 桩-土动力相互作用 砂土液化过程 振动台试验 孔压比 地震反应 

分 类 号：TU473.1[建筑科学—结构工程]