新建电缆盾构隧道近距离下穿既有地铁影响分析

以深圳北环电缆隧道南线下穿深圳既有地铁2号线岗厦北站-华强北站区间工程为依托,通过有限元数值模拟分析新建电缆盾构隧道近距离下穿地铁线路时对既有地铁的影响规律。研究结果表明,既有地铁的竖向沉降随着电缆隧道与既有地铁交叉角度的增加而减小;电缆隧道盾构掘进过程中会对既有地铁结构产生扰动,使其结构发生变形,最大沉降值发生在掘进掌子面后方15~20m;数值分析结果与现场实测数据趋势接近。

Analysis on influence of new cable shield tunnel under passing the existing subway at short distance

Based on the project of the south line of Shenzhen north ring cable tunnel passing under section between Gangxia North Station and Huaqiang North Station of existing Shenzhen metro line 2, through the finite element numerical simulation this paper analyzes the influence pattern of new cable shield tunnel on the existing metro when under passing the metro line in a short distance. The research results show that the vertical settlement of the existing metro decreases with the increase of the crossing angle between the cable tunnel and the existing metro, the cable tunnel shield tunneling disturbs the existing metro structure and makes its structure deform, the maximum settlement value is 15 ~ 20 m behind the excavation work face, and the numerical analysis results are approaching to the field measured data.