郑州大学学报（工学版）2011，Vol.32Issue(5)：24-29,6.
高速铁路隧道近接施工对既有市政隧道影响分析
Study on the Influence of the Tunnel of High-speed Railway Adjacent Excavation on Existing Municipal Tunnel
摘要
Abstract
Based on the design and construction of a new intercity railway tunnel construction in up-down cross existing municipal pipeline tunnel in Chengdu, the stress characteristics and displacement law of existing municipal pipeline tunnel in the process of dewatering construction and tunnel adjacent excavation were demonstrated with theory of fluid-solid coupling of finite discrete method( FDM ). The study results show that the variation and distribution of stress and displacement of primary support and secondary lining of existing municipal pipeline tunnel tend to be uniform, the value of displacement of infall section is the largest, which gradually decreases from the infall section to the ends along the longitudinal direction of the existing tunnel;the longitudinal stress at arch crown of tunnel is compressive stress and at invert of tunnel is tension stress in range of 30m in infall position;the influence value of dewatering construction is more larger than the influence of new tunnel construction on existing municipal pipeline tunnel, the proportion of displacement caused by dewatering construction is about 75 ~ 80 percent and the proportion of displacement caused by tunnel adjacent excavation is about 20 - 25 percent, the largest longitudinal tension stress caused by dewatering construction may be 1. 39 -3.39 times of the largest longitudinal tension stress caused by tunnel adjacent excavation. Therefore, it is necessary to take some measures to guarantee safety of the existing tunnel.关键词
既有市政隧道/近接施工/降水施工/力学特性Key words
existing municipal tunnel/close-space construction/dewatering construction/mechanical characteristics分类
交通工程引用本文复制引用
路军富,贾媛媛,魏龙海..高速铁路隧道近接施工对既有市政隧道影响分析[J].郑州大学学报（工学版）,2011,32(5):24-29,6.基金项目
四川省青年科技基金资助项目(09ZQ026-083) （09ZQ026-083）
