基于FLAC3D对古海塘塘前打桩振动的动力响应分析  

Dynamic Response Analysis of Ancient Seawall for Pile Driving Vibration Based on FLAC3D

作　　者：王海礼 祝湛毅 张默 WANG Hai-li;ZHU Zhan-yi;ZHANG Mo(Reconnaissance and Design Institute,Zhejiang Qiantang River Administration Bureau,Hangzhou 310016,China;Sino-steel Maanshan General Institute of Mining Research CO.,LTD.,Maanshan 243000,China)

机构地区：[1]浙江省钱塘江管理局勘测设计院,浙江杭州310016 [2]中钢集团马鞍山矿山研究总院股份有限公司,安徽马鞍山243000

出　　处：《浙江水利水电学院学报》2020年第5期18-22,共5页Journal of Zhejiang University of Water Resources and Electric Power

摘　　要：为了研究古海塘在打桩振动荷载作用下的动力响应规律,结合古海塘加固工程,以FLAC3D有限差分软件建立三维数值模型,并采用实测振动数据,分别从位移、速度以及应力等方面,研究了打桩振动荷载作用下,古海塘动力响应特性及其传播规律。研究发现:塘前打桩施工振动影响半径约20 m,垂直地表上下方向振动速度最大,垂直于堤轴线方向次之,堤轴线方向最小;随着打桩施工振动,塘面逐渐产生沉降,同时塘身向外江方向轻微倾斜。打桩施工造成的古海塘上下振动振速值集中分布在0.1~0.3 cm/s间,个别点最大振速达到0.52 cm/s,超过安全允许质点振动速度,在后续施工中应重点关注。In order to study the dynamic response law of ancient seawall under pile driving vibration load,combined with the reinforcement project of ancient seawall,the three-dimensional numerical model is established by the finite difference software FLAC3D,and the measured vibration data are used,respectively from the aspects such as displacement,velocity and stress,to study the dynamic response characteristics and propagation law of ancient seawall under pile driving vibration load.The results show that:if the impact radius of pile driving construction in front of the pond is about 20 m,the vibration speed is the largest in the vertical direction of the ground surface,followed by the direction perpendicular to the embankment axis,and the smallest in the direction of the dike axis;with the vibration of pile driving construction,the pond surface gradually subsides,and the pond body inclines slightly towards the outer river.The upper and lower vibration velocity of ancient seawall caused by piling construction is mainly distributed in the range of 0.1~0.3 cm/s,and the maximum vibration velocity of some points reaches 0.52 cm/s,which exceeds the safety allowable particle vibration velocity,which should be paid more attention in the follow-up construction.

关 键 词：古海塘 打桩振动 数值模拟 动力响应 

分 类 号：TV321[水利工程—水工结构工程]