Dynamic Response of Foundations during Startup of High-Frequency Tunnel Equipment  

作　　者：Dawei Ruan Mingwei Hu 

机构地区：[1]College of Civil and Transportation Engineering,Shenzhen University,Shenzhen,518060,China [2]State Key Laboratory of Intelligent Geotechnics and Tunnelling,Shenzhen University,Shenzhen,518060,China [3]Key Laboratory of Coastal Urban Resilient Infrastructures of Ministry of Education,Shenzhen University,Shenzhen,518060,China [4]Underground Polis Academy,Shenzhen University,Shenzhen,518060,China [5]Shenzhen Key Laboratory of Green,Efficient and Intelligent Construction of Underground Metro Station,Shenzhen University,Shenzhen,518060,China

出　　处：《Computer Modeling in Engineering & Sciences》2024年第7期821-844,共24页工程与科学中的计算机建模（英文）

基　　金：Smart Integration Key Technologies and Application Demonstrations of Large Scale Underground Space Disaster Prevention and Reduction in Guangzhou International Financial City([2021]–KJ058).

摘　　要：The specialized equipment utilized in long-line tunnel engineering is evolving towards large-scale,multifunctional,and complex orientations.The vibration caused by the high-frequency units during regular operation is supported by the foundation of the units,and the magnitude of vibration and the operating frequency fluctuate in different engineering contexts,leading to variations in the dynamic response of the foundation.The high-frequency units yield significantly diverse outcomes under different startup conditions and times,resulting in failure to meet operational requirements,influencing the normal function of the tunnel,and causing harm to the foundation structure,personnel,and property in severe cases.This article formulates a finite element numerical computation model for solid elements using three-dimensional elastic body theory and integrates field measurements to substantiate and ascertain the crucial parameter configurations of the finite element model.By proposing a comprehensive startup timing function for high-frequency dynamic machines under different startup conditions,simulating the frequency andmagnitude variations during the startup process,and suggesting functions for changes in frequency and magnitude,a simulated startup schedule function for high-frequency machines is created through coupling.Taking into account the selection of the transient dynamic analysis step length,the dynamic response results for the lower dynamic foundation during its fundamental frequency crossing process are obtained.The validation checks if the structural magnitude surpasses the safety threshold during the critical phase of unit startup traversing the structural resonance region.The design recommendations for high-frequency units’dynamic foundations are provided,taking into account the startup process of the machine and ensuring the safe operation of the tunnel.

关 键 词：Tunnel equipment high-frequency units startup conditions transient dynamics dynamic response foundation design 

分 类 号：U45[建筑科学—桥梁与隧道工程]