基坑工程对轨道交通区间隧道的影响与保护

Effect of Excavation on Rail Transit Interval Tunnel and Protection Measures

基坑工程对与之相关的轨道交通区间隧道的影响及保护措施直接决定了工程的安全性和经济性。基于"时空效应"原理从基坑分坑设计、支护结构、土体加固、抗拔桩、分块开挖与底板浇筑、信息化施工等多个方面总结了常用的保护措施;梳理现有的影响分析方法,并依托中国博览会会展综合体E区和北横通道两个工程实例进行验证。分析认为:设计采取的保护措施可有效控制变形,可供类似工程参考。

Excavation engineering would influence the nearby rail transit interval tunnel. The protection measures of excavation directly determine the safety and economy. Based upon the time-space effect theory, the common protection measures are reviewed including excavation pit separation, retaining structure, soil consolidation, uplift pile, excavation in parts and base slab pouring, and information construction. The methods used to analyze the excavation effects are summarized. Two cases are studied, i.e. the excavation pit of E zone of China Expo Complex and the excavation pit of Beiheng Corridor. According to the analysis, the protection measures can effectively control the deformation of rail transit interval tunnel.