盾构机空推过站对既有桩基的影响

Influence of shield machine passing through the station on existing pile foundation

本文依托福州滨海快线枕峰山与大象山隧间TBM空推过站项目,深入分析了盾构机空推过站过程,对地层以及对已建桥梁桩基础的变形和受力特性的影响规律。建立了模拟实际盾构机空推过站的三维有限元模型,通过对地基土变形、桩基侧向位移以及桩身内力变化的研究,确定了盾构机推进过程中对地层及桩基的影响域。

Based on the project of TBM passing through the station between Zhenfengshan and Daxiangshan Tunnel on Fuzhou Binhai Express Line,this paper deeply analyzes the influence law of shield machine passing through the station on the stratum and the deformation and mechanical characteristics of the pile foundation of the existing bridge.A three-dimensional finite element model is established to simulate the actual shield machine passing through the station.By studying the deformation of foundation soil,the lateral displacement of pile foundation and the change of internal force of pile body,the influence area of shield machine on stratum and pile foundation is determined.