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随着隧道工程的发展,隧道交叉穿越的情况越来越多,隧道的规模亦越来越大,如何减少隧道穿越施工对已建隧道的影响亦成为目前研究的重点之一。本文以上海沿江通道盾构施工下穿轨道交通3号线节点为研究对象,采用Midas/GTS软件建立三维弹塑性模型,通过激活钝化不同单元模拟盾构施工,分析对轨道交通3号线的影响。分析发现,超大直径盾构施工开挖卸除的土方量大,将引起较大的土体上抬,位移量已大大超过地层损失产生的地面沉降,使得隧道斜向上约45°角所包含的梯形范围内的土体(包含地铁结构)发生上抬现象。为确保3号线的位移最小,合理确定压重值,对不同的压重值进行参数分析,并进行工程类比,表明最佳值约为50 k Pa。
With the development of tunneling projects, more and more tunnels cross the tunnels and the tunnels are also getting larger and larger. How to reduce the impact of tunneling on the tunnels has also become one of the focuses of current research. In this paper, the three-dimensional elasto-plastic model was established by using the Midas / GTS software to construct the three-dimensional elasto-plastic model under the construction of Shanghai Yanjiang channel under shield tunneling. By activating the passivation of different elements to simulate the shield construction, influences. The analysis shows that the large amount of earthwork removed by excavation of large diameter shield excavation will cause large soil elevation and the displacement has greatly exceeded the ground subsidence caused by formation loss so that the angle of the tunnel is about 45 ° The soil (including the metro structure) in the trapezoidal range is lifted. In order to ensure that the displacement of line 3 is the smallest, the weight value is reasonably determined, the parameters of different weight values are analyzed, and the engineering analogy is made, which shows that the optimum value is about 50 kPa.