桩基施工对邻近既有地铁隧道影响的数值分析

来源期刊:中南大学学报(自然科学版)2019年第2期

论文作者:丁智 张霄

文章页码:390 - 400

关键词:桩基施工;盾构隧道;隧道变形;影响分区

Key words:pile foundation construction; metro tunnel; tunnel deformation; affected area

摘    要:采用数值分析方法,建立桩-隧相互作用的三维有限元模型,通过改变桩-隧相对位置、隧道埋深、水平净距、桩基半径和考虑群桩因素,研究静压桩基施工对软土地区既有地铁隧道的影响。研究结果表明:桩基侧面施工引起的隧道变形较大,且随着桩身与隧道水平净距增大,变形在传递过程中不断衰减;浅埋隧道受扰动影响较为敏感,产生变形较大;桩基半径增大也会加剧隧道结构的变形;桩基邻近既有地铁隧道施工的影响区可划分为强影响区、一般影响区和弱影响区;群桩中的已存在桩对挤土效应具有阻挡效应。

Abstract: The method of numerical analysis was used to establish three-dimensional finite element model of pile-tunnel interaction, and the influence of static pressure pile foundation construction on existing metro tunnel in soft soil was studied by changing the relative position of the pile-tunnel, the tunnel depth, the horizontal distance, the pile radius, and considering the group piling effect. The results show that tunnel deformation caused by the side of pile foundation construction is large. With the increase of net distance between pile and tunnel, the tunnel deformation is continuously attenuated in the process of transmission, and the degree of influence is gradually weakened. The shallow tunnel is sensitive to disturbance and presents huge deformation. The increase of pile radius will also aggravate deformation of the tunnel structure. It is proposed that the influence of pile construction adjacent to the existing metro tunnels is divided into strong influence areas, general influence areas and weak influence areas. It has been verified that the existing piles in the pile group have a blocking effect on the squeezing soil effect.

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