一侧有建筑物时盾构引起地表沉降的数值分析
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天津市软土特性与工程环境重点实验室开放基金资助项目(2011SCEEKL001)


Numerical analysis of the ground movement induced by shield tunneling with a existing building on one side
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    摘要:

    利用有限元程序Midas/GTS,综合考虑土体非线性、土体与盾构作用、注浆压力、千斤顶推力、密封舱土压力等要素,建立了隧道-土-桩基-建筑物三维非线性有限元模型。研究地表一侧存在建筑物时及盾构施工参数对地表沉降的影响。通过三维仿真数值模拟得出以下结论:地表存在建筑物时,地表沉降最大值比无建筑物时要小,且最大沉降值背离建筑物方向,偏离盾构中心轴线;盾构支护压力越接近侧向静止水土压力地表沉降越小,合理的控制盾构施工参数(注浆压力、盾构机千斤顶推力)可以有效减小地表沉降。

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    Being taken into account the nonlinearity of soil,the interaction of soil and shield tunnel, grouting pressure,jack thrust pressure and airlock earth pressure to establish a three dimensional nonlinear finite element model was established by using the finite element program Midas / GTS. The influence on the surface settlement of adjacent surface structures and shield tunneling was studied. The result shows that the maximum settlement value with structure is smaller than which without structure; the maximum settlement value is on the opposite direction of the structure,and deviates from the central axis of the shield; the closer to the lateral earth pressure at rest the shield support pressure is,the smaller the surface subsidence will be; reasonable control shield tunnel parameters( grouting pressure,jack thrust) can effectively reduce surface settlement.

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杨海勇,鹿群.一侧有建筑物时盾构引起地表沉降的数值分析[J].河北工程大学自然版,2013,30(4):30-34

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  • 收稿日期:2013-07-10
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  • 在线发布日期: 2015-01-12
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