抛石基床振动夯实离散元数值模拟分析  

Numerical simulation of vibration compaction of rubble-mound foundation bed by discrete element method

作　　者：罗俊兴 周红星[1,2,3] 刘剑锋 LUO Junxing;ZHOU Hongxing;LIU Jianfeng(CCCC Fourth Harbor Engineering Institute Co.,Ltd,Guangzhou 510230,China;Key Laboratory of Environment Protection&Safety of Transportation Foundation Engineering of CCCC,Guangzhou 510230,China;Southern Marin Science and Engineering Guangdong Laboratory(Zhuhai),Zhuhai 519000,China)

机构地区：[1]中交四航工程研究院有限公司,广东广州510230 [2]中交交通基础工程环保与安全重点实验室,广东广州510230 [3]南方海洋科学与工程广东省实验室,广东珠海519000

出　　处：《水运工程》2023年第3期151-156,182,共7页Port & Waterway Engineering

摘　　要：针对高频液压振动夯实抛石基床密实机理与施工参数优化问题,基于振夯试验条件及结果,建立合理的颗粒离散元模型。分析夯沉量、基床孔隙比和竖向应力,并分析不同激振力和振动频率作用下的基床振动响应影响规律。结果表明:1)夯沉量在初始阶段急剧增大,随后逐渐趋于平缓。振夯作用下抛石基床竖向应力沿深度基本呈线性变化。2)最大激振力为150 kPa时,基床浅层达到较好的振动密实效果。而对于基床深层块石,激振力越大振动密实效果越好,即最大激振力为200 kPa效果较好。3)对于基床不同深度处的块石,振动频率25 Hz达到较好的振动密实效果。Regarding the problems of compacting mechanism and construction parameter optimization of high-frequency hydraulic vibration compaction riprap foundation bed,a reasonable particle discrete element model is established based on the conditions and results of vibration compaction test.The rammed settlement,the void ratio and the vertical stress of the foundation bed are analyzed,and the influence of the vibration response of the foundation bed under different excitation forces and vibration frequencies is analyzed.The results show that:1)At the initial stage,the amount of rammed settlement increases rapidly,and then gradually tends to smooth.The vertical stress of riprap bed under vibro-ramming has a linear change along the depth.2)When the maximum exciting force is 150 kPa,the shallow subgrade of the foundation bed has a good compaction effect.But for the deep stone foundation bed,the greater the exciting force,the better the compaction effect,that is,the maximum exciting force is 200 kPa.3)For the stones in different depth of the foundation bed,the vibration frequency of 25 Hz can achieve a good vibration compaction effect.

关 键 词：振动夯实 抛石基床 颗粒离散元 基床应力 

分 类 号：TU473[建筑科学—结构工程] U656[建筑科学—土工工程]