运营地铁隧道近大直径基桩施工影响变位空间分布研究

Analysis on Spatial Distribution of Displacement Influenced by Pile Construction Near Large Diameter Foundation of Metro Tunnel in Operation

本文基于杭州某高架桥桩基的试桩工程,通过对现场实测分析,得到如下结果:软土地层大直径桩(D=1.5 m)施工对邻近既有运营隧道的影响范围为0.33~0.50 H(H为桩长)。近桩隧道比远桩隧道受基桩施工影响的敏感度相对更高,以同期的变化速率来看,约是1.5~2.6倍关系。基桩施工对于远处的右线隧道几乎无影响。

Based on the pile test project of a viaduct foundation in Hangzhou,the following results are obtained through the analysis of the field measurement:The influence range of construction of large diameter pile in soft soil layer(D=1.5 m)on the adjacent existing operating tunnel is 0.33-0.50 H(H is pile length).The sensitivity of near-pile tunnel to the influence of foundation pile construction is relatively higher than that of far-pile tunnel,and the change rate is about 1.5-2.6 times in the same period.Foundation pile construction has little effect on the far right line tunnel.