基于离散单元法碎石垫层隔震性能的宏细观分析  

Macro and Micro Analysis of Seismic Isolation Performance of Gravel Cushion Based on Discrete Element Method

作　　者：张昕 戴国亮[2,3] 栾阳 张倩[2,3] 贾其军[1] Zhang Xin;Dai Guoliang;Luan Yang;Zhang Qian;Jia Qijun(China Road and Bridge Corporation,Beijing 100011,China;School of Civil Engineering,Southeast University,Nanjing 210096,China;Key Laboratory of Concrete and Prestressed Concrete Structure of Ministry of Education,Southeast University,Nanjing 210096,China)

机构地区：[1]中国路桥工程有限责任公司,北京100011 [2]东南大学,土木工程学院,南京210096 [3]东南大学,混凝土及预应力混凝土结构教育重点实验室,南京210096

出　　处：《震灾防御技术》2023年第3期595-603,共9页Technology for Earthquake Disaster Prevention

基　　金：中交集团重点科研课题(2016-zjjt-24)。

摘　　要：为研究非接触桩箱复合基础中碎石垫层隔震性能,采用颗粒流软件PFC^(3D)对碎石垫层和沉箱进行模拟分析,从宏细观多角度对碎石垫层隔震性能进行分析。研究结果表明,竖向压力、垫层厚度对垫层隔震效果的影响较大;地震动加载过程中,垫层底部颗粒水平相对位移较大,垫层中上部颗粒水平相对位移较小,颗粒配位数及垫层孔隙率与碎石垫层隔震效果关系密切。In order to study the seismic behavior of gravel cushion set up in the unconnected piles-caisson foundation,particle flow analysis software PFC^(3D) was used to numerically simulate the shake table tests of gravel cushion and caisson and to study the seismic isolation performance of the gravel cushion from macro and micro view.The results shows that vertical pressure and thickness of the cushion have significant influence on isolation effect of the gravel cushion.During ground shaking loading,the horizontal relative displacement of particles at the bottom of the cushion is large,and the horizontal relative displacement of particles at the middle and upper part of the cushion is small.The changes of particle coordination number and cushion porosity are closely related to the seismic isolation effect of gravel cushion.

关 键 词：碎石垫层 基础 隔震 减震率 颗粒 离散元 

分 类 号：TU352.12[建筑科学—结构工程]