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首页> 外文会议>International Conference on Electronic and Mechanical Engineering and Information Technology >Numerical Analysis of Influence of Large-Diameter EPB Shield Tunneling on Ground Deformation in Beijing Area
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Numerical Analysis of Influence of Large-Diameter EPB Shield Tunneling on Ground Deformation in Beijing Area

机译：大直径EPB盾构隧道对北京地区地面变形影响的数值分析

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摘要

A large-diameter earth pressure balanced (EPB) shield has been firstly used in the Beijing metro line 14 in China. In this paper, to take the experimental project of the metro line 14 as an engineering background, the tunneling process of the EPB shield with an outer diameter of 10 m was simulated using the three-dimensional finite element method. The numerical results show that the ground settlement mainly appears in three phases during the shield tunneling: before the arrival of shield, the arrival of shield and the grouting phase, and they take respectively 32%, 45% and 23% of the total settlement. During the backfill grouting, the soil deformation around the segments goes up in the normal direction of the segments with the increase of grouting pressure. However, as the grouting pressure decreases, the rebounding of ground deformation occurs. Only increasing the grouting pressure to control the ground deformation is not effective. The influence of supporting pressure in soil chamber on excavation soil disturbance is evident. When the supporting pressure is less than a half of earth press at rest, the excavation face may be not stable and collapse during the shield tunneling, however, when the supporting pressure is more than 2 times earth press at rest, the soil ahead of the shield cutter is obviously squeezed.
机译：在中国北京地铁14号线首先使用大直径的地球压力平衡（EPB）盾牌。在本文中，将地铁线14的实验项目作为工程背景，使用三维有限元方法模拟外径为10μm的EPB屏蔽的隧道处理。数值结果表明，地面沉降主要出现在盾牌隧道期间的三个阶段：在盾牌到达之前，盾牌和灌浆阶段的到来，他们占总沉降的32％，45％和23％。在回填灌浆期间，随着灌浆压力的增加，区段周围的土壤变形在段的法线方向上升。然而，随着灌浆压力降低，地变形的反弹发生。只增加控制地面变形的灌浆压力才能无效。土壤室中的支撑压力对挖掘土壤紊乱的影响是显而易见的。当支撑压力静止的支撑压力小于一半的地球压力机时，挖掘面在屏蔽隧道期间可能是不稳定的并且塌陷，然而，当支撑压力超过2次地球压力机时，在休息时，土壤前面的土壤屏蔽切割器显然挤压。

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