软土地层双线盾构隧道下穿既有双线隧道数值分析

作者：刘宇¹,葛爱迪²,孙森¹,张东明¹,周亚东²

作者简介：

刘宇,高级工程师,E⁃mail:573218287@ qq. com

作者单位：

1. 中交一公局第八工程有限公司,天津 300171; 2. 天津城建大学土木工程学院,天津 300384

基金项目：

∗国家自然科学基金 ( 51608351 ); 天津市自然科学基金(18JCZDJC10010)

摘要：

以软土地层场地双线盾构隧道掘进下穿既有双线隧道为研究对象,利用 PLAXIS 3D 有限元软件建立盾构隧道掘进穿越既有隧道三维有限元模型,分析盾构掘进对周围土体和既有双线隧道竖向位移的影响. 研究结果表明,新建盾构隧道掘进对周围土体具有明显扰动作用,进而影响既有双线隧道;新建盾构隧道掘进时,隧道拱底隆起,拱顶沉降;随着深度的增加,既有双线隧道中心线所在断面土体和既有右线隧道竖向位移曲线均逐渐由 V 形转变为 W 形.

关键词：隧道;盾构;软土地层;沉降;隆起;有限元分析

English：

Taking the excavation of double⁃line shield tunnels undercrossing existing double⁃line tunnelsin soft soil layer as the research subject, this study establishes a three⁃dimensional finite element model ofshield tunneling undercrossing existing tunnels using PLAXIS 3D software, analyzing the influence ofshield tunneling on the vertical displacement of surrounding soil and the existing double⁃line tunnels. Theresearch results show that the excavation of the new shield tunnels causes significant disturbance to thesurrounding soil, thereby affecting the existing double⁃line tunnels. During the excavation of the newshield tunnels, upheaval occurs at the tunnel invert while settlement occurs at the tunnel crown. As thedepth increases, the vertical displacement curves of both the soil at the cross⁃section along the centerlineof the existing double⁃line tunnels and the existing right⁃line tunnel gradually transition from a V⁃shape toa W⁃shape.

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