超宽下穿隧道基坑上跨施工对区间盾构隧道影响数值分析  

Numerical Analysis of the Influence of Over Crossing Construction of Ultra-Wide Underpass Tunnel Foundation Pit on Interval Shield Tunnel

作　　者：朱招庚[1] 王敏 郭功春 ZHU Zhao-geng;WANG Min;GUO Gong-chun(China Railway Eryuan Engineering Group Co.Ltd.,Chengdu 610031,China)

机构地区：[1]中铁二院工程集团有限责任公司,成都610031

出　　处：《工程建设与设计》2024年第22期11-13,共3页Construction & Design for Engineering

摘　　要：以成都地区超宽下穿隧道基坑上跨地下区间盾构隧道施工为依托,采用三维数值分析法分析了基坑开挖及回填对既有地下区间盾构隧道的影响。结果表明,基坑开挖引起上跨区间上方地层变形增加,且呈现临近基坑中部最大的趋势;随着上部土体的回填,上跨区间上方地层的变形呈下降趋势;同时地下区间隧道最大的竖向位移约3.16 mm,最大值发生在机动车道基坑开挖的中部。Based on the construction of shield tunnel with super-wide underpass tunnel in Chengdu area, the influence of foundation pit excavation and backfilling on the existing shield tunnel in underground section is analyzed by using three-dimensional numerical analysis method. The results show that the excavation of foundation pit causes the deformation of the strata above the upper cross-zone to increase,and it shows the largest trend near the middle of the foundation pit, and with the backfilling of the upper soil, the deformation of the stratum above the upper cross-zone shows a downward trend. At the same time, the maximum vertical displacement of the underground tunnel is about 3.16 mm, and the maximum value occurs in the middle of the excavation of the motorway foundation pit.

关 键 词：超宽基坑 地下区间盾构隧道 上跨施工 数值分析 

分 类 号：U456[建筑科学—桥梁与隧道工程]