不同形式坡面加固桩对基坑下部盾构隧道抗隆起作用分析

Analysis on the Effect of Different Forms of Slope Reinforcement Piles on the Uplift Displacement of Shield Tunnels Below the Foundation Pit

随着我国城市地下空间的不断开发,上跨既有盾构隧道的基坑工程将越来越多。在基坑工程中,桩为重要的支护构件。本文以徐州轨道交通1号线杏山子车辆段出入段线基坑上跨路杏区间右线盾构隧道实际工程为依托,得出了当桩深不及盾构隧道拱顶时,边坡加固桩对盾构隧道隆起的抑制作用较小的结论。通过此结论可有效避免工程浪费和措施滥用。

With the continuous development of urban underground space in China,there will be more and more foundation pit projects across the existing shield tunnels.In foundation pit engineering,piles are important supporting members.This paper is based on Xuzhou Rail Transit Line 1.In the project,the foundation pit of Xingshanzi Depot in and out line is above the shield tunnel of Luxing subway tunnel.Through this practical project,it is concluded that when the pile depth is less than that of the shield tunnel vault,the side slope reinforced piles have less inhibitory effect on the shield tunnel uplift.This conclusion can effectively avoid engineering waste and measures abuse.