如何预估新建隧道施工对既有线的影响并采取有效措施保障既有线的结构安全及正常运营是处理近接施工面临的关键问题.结合深圳地铁11号线车红区间盾构施工近距离上跨既有1号线工程,通过施工前数值模拟分析确定盾构施工对既有线的影响范围和影响度,在盾构到达前对地层进行预加固处理,并在整个施工过程中对既有隧道实时监测,盾构施工过程中严格控制掘进参数,有效确保了既有线的安全,为类似工程提供参考和借鉴.%How to estimate the impact of new tunnel construction on existing lines and take effective measures to guarantee the structural safety is the critical issues to handle this kind of adjacent construction. In this paper, combined with the project of Shenzhen Metro Line 11 crossing from the existing line, scope and degree of influence was found through numerical simulation analysis of shield tunnel construction. To ensure the safety of existing lines, reinforcement and control the parameters of shield tunneling was taken, and monitor the existing tunnel in 24 hours. At last it successful pass through, and can provide reference for the similar engineering.
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