摘要
钢板桩是基坑开挖围护结构的主要形式之一,其振动贯入土体过程中可能诱发周围场地动力扰动,从而引发一系列工程环境问题。采用有限元模拟探究了黏土场地拉森钢板桩振动打入施工对周围环境的影响规律。首先,采用南水静力模型和哈丁动力模型分别描述场地土的静、动力学特性,并将其植入数值模拟软件;其次,开展了钢板桩振动贯入过程数值模拟,研究了激振频率与工程环境扰动的相关性。结果表明,钢板桩凸侧的土体振动速度一般大于凹侧土体,桩体贯入对径向、竖向扰动比切向大;钢板桩周围土体振动速度随距离增大而呈指数式衰减,随激振频率提高而降低;与振源距离越小处的土体其振动速度受频率的影响越大。
Steel sheet pile is one of the main forms of retaining structure in braced excavation.During its vibration penetration into soil,it may induce dynamic disturbance to surrounding site and lead to a series of engineering environmental problems.The influence of vibration driving construction of Larssen steel sheet pile on the surrounding environment is studied by finite element simulation for a clay site.Firstly,the static and dynamic characteristics of the site soil were described by using the NHRI model and the Harding dynamic model,which were implemented into the numerical simulation software.Secondly,numerical simulation of steel sheet pile vibration penetration process is carried out to study the relationship between excitation frequency and engineering environmental disturbance.The results show that the vibration velocity of soil on the convex side of steel sheet pile is generally higher than that on the concave side,and the radial and vertical disturbance of pile penetration is larger than that on the tangential side.The soil vibration velocity around the steel sheet pile decreases exponentially with the increase of distance and decreases with the increase of excitation frequency.The smaller the distance from the vibration source,the greater the influence of frequency on the vibration velocity of soil.
作者
袁亮
杨正玉
吴祖云
高洪梅
武颖利
申志福
YUAN Liang;YANG Zhengyu;WU Zuyun;GAO Hongmei;WU Yingli;SHEN Zhifu(The 3rd Geological Brigade of Jiangsu Geology&Mineral Exploration Bureau,Zhenjiang,Jiangsu 212001,China;College of Transportation Engineering,Nanjing Tech University,Nanjing,Jiangsu 211816,China;Nanjing Hydraulic Research Institute,Nanjing,Jiangsu 210029,China)
出处
《施工技术（中英文）》
CAS
2023年第7期51-56,62,共7页
Construction Technology
基金
国家自然科学基金青年基金(51908284)
江苏省科技厅自然科学基金青年基金(BK20190667)。
关键词
基坑
支护
钢板桩
动力响应
本构模型
振动贯入
foundation excavation
supports
steel sheet pile
dynamic response
constitutive model
vibratory driving
