基于数值模拟的矩形隧道施工方案比选研究

发布时间：2019-01-17 08:42

【摘要】：为了保证隧道施工和后期运行的安全,要选择出一个普遍适用于大断面矩形隧道的开挖方案。采用FLAC3D有限差分软件对3种不同的施工方案进行数值计算,对施工过程中隧道周围岩体位移、地表沉降以及周围岩体应力变化的计算结果进行对比分析,结果表明,采用先开挖隧道两侧岩体,后开挖隧道中部岩体的施工方案在应力集中程度和地表沉降方面比其余两种方案最大可降低41.3%和9.5%;隧道开挖过程中对地表沉降影响的范围大致为隧道跨度的5倍;浅埋大断面矩形隧道两侧岩体水平位移模式为向隧道外侧位移,与一般隧道不同。最后,优选出的施工方案将为大断面矩形隧道的实际施工提供参考。
[Abstract]:In order to ensure the safety of tunnel construction and later operation, a general excavation scheme suitable for large section rectangular tunnel should be selected. The numerical calculation of three different construction schemes was carried out by using FLAC3D finite difference software. The calculated results of rock mass displacement, surface settlement and surrounding rock mass stress change around the tunnel during the construction process were compared and analyzed. The construction scheme of excavating the rock mass on both sides of the tunnel first and then excavating the rock mass in the middle of the tunnel can reduce the maximum stress concentration and surface settlement by 41.3% and 9.5% compared with the other two schemes. The range of influence on surface settlement during tunnel excavation is about 5 times of that of tunnel span, and the horizontal displacement model of rock mass on both sides of shallow large section rectangular tunnel is lateral displacement of tunnel, which is different from that of normal tunnel. Finally, the optimized construction scheme will provide a reference for the practical construction of large section rectangular tunnel.
【作者单位】：河南理工大学土木工程学院;
【基金】：国家自然科学基金项目,项目编号51374093 河南理工大学博士基金项目,项目编号B2012-051
【分类号】：U455.4

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