水下抛石基床高频振动致密机制  

Densification mechanism of underwater rubble-mound foundation by high-frequency vibratory hammers

作　　者：何燕清[1] 黎浩然 陈福全[2] 

机构地区：[1]福州大学至诚学院,福建福州350000 [2]福州大学土木工程学院,福建福州350116

出　　处：《南昌大学学报（工科版）》2017年第4期347-353,379,共8页Journal of Nanchang University(Engineering & Technology)

基　　金：国家自然科学基金资助项目(40972200)

摘　　要：为使水下抛石基床得到更为充分的密实效果,采用高频液压振动锤对水下抛石基床进行振动致密是一种新工法,通过颗粒离散元方法,研究了水下抛石基床在高频振动过程中的致密机制以及振动频率、激振力、抛石体颗粒级配对高频振动致密效果的影响。其结果表明:对水下抛石基床采用高频振动致密工艺能取得较好的密实效果,振动结束后,基床整体孔隙比明显减小;高频振动致密的效果受到振动频率、激振力和抛石体颗粒级配等因素的影响。To the port engineering projects having construction characteristics of variable depth and high precision,the density effect of underwater rubble-mound foundation by traditional compaction method often cannot meet the construction requirements.In order to obtain a more fully density effect for the underwater rubble-mound foundation,the vibratory compaction by high-frequency hydraulic vibratory hammer became a new trend of densification technology.Based on the existing site construction experiences,the densification mechanism of underwater rubblemound foundation in the process of high frequency vibration,and the influences from vibration frequency,exciting force and the riprap grain size distribution on high-frequency vibration densification were studied by granular distinct element method.The results showed that the underwater rubble-mound foundation can obtain a better density effect by using high-frequency vibration densification technique and the overall void ratio of foundation bed decreased obviously after the vibration ended.What＇s more,the effect of high-frequency vibration densification is influenced by vibration frequency,exciting force and riprap grain size distribution.

关 键 词：水下抛石基床 高频振动致密 颗粒离散元 孔隙比 

分 类 号：TV92[水利工程—水利水电工程]