浅埋小间距隧道开挖围岩变形及控制对策--《隧道建设》2006年03期

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浅埋小间距隧道开挖围岩变形及控制对策

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q4?"KK#g1w/P0【摘要】:采用FLAC软件对地表有相对硬壳层的粉沙层中隧道开挖之后地层的变形机理进行模拟,通过分析隧道开挖后围岩变形的空间效应特性曲线,确定隧道开挖支护后引起的围岩变形的幅度和范围,找出隧道开挖最不利荷载工况和结构薄弱部位,为施工方案提供理论依据和决策支持。研究表明,不同的施工顺序引发不同的施工力学状态,进而引起不同的施工力学效应,隧道开挖先后顺序不同对围岩区域、幅度的扰动也不同。以北京地铁某车站的实测为基础,分析了粉沙地层中隧道施工不同工序引起的各部分变形情况,进而提出了相应的工程措施。水利论文8R;bxoz @}7Ja @

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隧道 小间距 围岩变形 控制对策水利论文v*V/P#@8qCL

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1前言随着我国城市大规模地下空间开发利用的蓬勃发展,由地下工程开挖而引发的环境问题(主要是指施工过程中由地层变形失控所引起环境灾害,包括地面建筑物、道路、管线等构筑物的损害)已成为城市现代化建设中的一个亟待解决的问题。因此,研究城市地下工程开挖过程中地表沉降

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