近距隧道后行盾构对先行隧道影响的数值模拟分析

Numerical Simulation Analysis of the Influence of the Backward Shield in the Short Distance Tunnel on the Antecedent Tunnel

随着城市的发展,城市地下空间利用率越来越大,为了更大限度上利用地下空间,地铁隧道之间的距离越来越近,小间距盾构施工的研究越来越多。针对小间距盾构施工,文章依托实际工程,利用FLAC3D数值模拟软件建立数值分析模型,对后行盾构施工影响下先行隧道的变形情况、内力分布情况进行研究,研究结构表明:后行盾构引起的先行隧道变形呈椭圆形,隧道整体下沉并远离后行隧道;先行隧道最大拉应力和最大压应力主要分布在隧道拱顶靠近后行隧道一侧和拱底靠近后行隧道一侧。

With the development of the city,the utilization rate of urban underground space is getting larger and larger.In order to utilize the underground space to a greater extent,the distance between subway tunnels is getting closer and closer,and the research on small spacing shield construction is increasing.In view of the small spacing shield construction,this paper relies on the actual project and uses FLAC3D numerical simulation software to establish a numerical analysis model to study the deformation and internal force distribution of the antecedent tunnel under the influence of the backward shield construction.The research structure shows that the deformation of the antecedent tunnel caused by the backward shield is elliptical,and the tunnel is sinking as a whole and far from the backward tunnel.The maximum tensile stress and maximum compressive stress of the antecedent tunnel are mainly distributed on the side of the tunnel vault near the backward tunnel and the side of the arch bottom near the backward tunnel.