高大断面隧道与既有桥墩桩基相邻开挖施工技术

Construction Technology of Excavation of High and Large Cross-Section Tunnel Adjacent to Pile Foundation with Existing Bridge Pier

城市地铁隧道侧穿既有建(构)筑物,在施工开挖支护过程中,为确保既有建筑物结构安全及正常施工功能,隧道本体工程质量,结合工程现场的实际情况对开挖及防护施工技术进行分析研究。本文结合贵阳市城市轨道交通2号线一期工程,分析开挖支护及防护既有桥桩基稳定施工技术,并进行了数值模拟,结果表明采用的施工措施能有效保护桩基安全,控制桩基的沉降,为今后类似工程的施工提供一定的参考。

In order to ensure the structural safety and normal construction function of the existing building,the construction quality of the tunnel body is constructed in the course of the excavation and supporting of the city subway tunnel when it crosses an existing building. Analysis and research on excavation and protection construction technology bases on actual situation of engineering site. Based on the first phase of the Guiyang Urban Rail Transit Line 2 project,it analyzes the excavation support and protects the existing stable construction technology of the bridge pile foundation,and carries out numerical simulation. The results show that the use of construction measures can effectively protect the safety of piles,and control the settlement of pile foundation for the future construction of similar projects to provide a certain reference.