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北京地铁敞口式盾构掘进对砂层土体扰动规律研究

ZHANG Jian,WANG Shu-ying,YANG Jun-sheng,ZHANG Xi-bao

Journal of Northeastern University（2016）

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Abstract
敞口式盾构在砂层掘进时会扰动周围土体，易引起地层坍塌.以北京地铁6号线2期敞口式盾构施工段为工程背景，阐述了国内首台挤压式敞口盾构机机体构造及开挖工序，通过地表沉降和地中水平位移监测，研究了盾构掘进对砂层的扰动特征.结合盾构掘进参数分析，探讨了减少土体扰动的控制措施.研究表明，盾构接近测孔区阶段，土体变形规律最复杂；通过和刚脱离测孔区阶段是土层变形控制的重要环节；盾构隧道轴线两侧1.5倍洞径范围内是土体扰动主要区域.所得结论可为砂土地层敞口式盾构施工地层位移控制提供可鉴参考.
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Key words
sandy stratum,deformation characteristics,soil disturbance,open-face shield,excavation system
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