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大跨小净距隧道合理开挖方法与支护参数对比研究

, PP. 101-107

Keywords: 隧道工程,有限元分析,开挖方法,支护参数,安全净距

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Abstract:

结合魁岐大跨小净距隧道工程实践,建立了大跨小净距隧道施工动态有限元分析程序,对不同围岩条件下隧道施工方案进行了数值模拟分析。分析中模拟了CRD法、双侧壁导坑法、弧形导坑预留核心土法、台阶法4种开挖方案,对拱顶下沉、水平收敛、地表沉降、中间岩柱应力和围岩稳定性等进行了对比分析,比选确定出不同围岩等级条件下大跨小净距隧道合理的开挖方法。同时,分析不同等级围岩,3种中岩柱支护参数对隧道围岩稳定性的影响。最后,通过分析隧道围岩位移、应变随净距的变化,确定隧道最小净距为0.55B是安全的。

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