摘要
利用有限元数值模拟方法,研究地下管道的瑞雷波响应规律.在单点激发单道接收的震动映像方式下,瑞雷波遇管道的信号响应特征是产生弧形反射带.通过一系列含有地下管道的有限元模型的计算,拟合出管线埋深h和瑞雷波波速VR、反射特征信号带顶端时间历程Δt的关系式,为管线埋深的快速判定提供一个量化标准,并在工程实例中得到验证.经过不同管道埋深和不同偏移距相结合的模型的计算,总结偏移距变化对瑞雷波响应特征信号的影响规律,为工程勘察中偏移距的合理选择提供理论依据和参考.
The Rayleigh wave response pattern of underground pipeline is studied by using finite element numerical simulation method.the mode of single-point excitation and single-channel receiving vibration mapping,the signal response of Rayleigh waves in pipelines is characterized by the generation of arc-shaped reflection bands.Through a series of calculation of the different finite element models of the underground pipes,the mathematical relation among the buried depth of pipelines(h)and Rayleigh wave speed(VR)and the time history Δt at the top of the arc reflection signal band was fitted,which can provide a quantitative standard for rapid determination of the pipeline buried depth and is verified in the engineering practice.By calculating the models of the different buried depth of pipes and different cannon separation distance,the response pattern of the cannon separation distance change on Rayleigh wave was summarized,providing the theoretic basis and reference for the reasonable selection of the cannon separation distance in geotechnical investigation.
作者
支雁飞
张献民
ZHI Yanfei;ZHANG Xianmin(Department of planning and construction,Civil Aviation University of China,Tianjin 300300,China;School of Airport college,Civil Aviation University of China,Tianjin 300300,China)
出处
《河北工业大学学报》
CAS
2018年第6期100-106,共7页
Journal of Hebei University of Technology
基金
天津市交通运输科技发展计划项目(2016A-02-01)
关键词
地下管道
瑞雷波
有限元模拟
信号响应规律
管道埋深
偏移距
underground pipes
Rayleigh wave
Finite element simulation
signal response rule
buried depth of pipes
cannon separation distance
