摘要
结合南京龙蟠路隧道(南侧)西段上跨既建成的地铁1号线双线盾构隧道的基坑工程,针对未经加固以及运用高压旋喷法加固基坑坑内地基两种工况,采用ANSYS对已建地铁盾构隧道隆起位移进行三维弹塑性有限元数值模拟。模拟计算结果表明,坑内未经加固基坑开挖后下部隧道隆起位移过大;坑内加固后基坑开挖不会造成下部隧道过大的隆起位移是安全可行的,该结论与工程实际监测结果相符。
The protection of the Longpan Tunnel's excavation which are right beyond two existing shield tunnels of Nanjing No.1 subway is presented. Corresponding to unstabilizing condition and stabilizing condition with high-pressure chemical churning piles,the existing shield tunnel's upwarping deformation during the excavation is analyzed with ANSYS software of 3-D elasto-plastic finite element method. It is observed that the tunnel's upwarping deformations were too great without stabilizing and are safet with stabilizing. The calculated results are compared with the in-situ observation data.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2007年第S1期653-657,共5页
Rock and Soil Mechanics
基金
南京水利科学研究院博士研究生基金(No.YY30602)。
关键词
基坑工程
盾构隧道
隆起位移
三维数值模拟
foundation excavation
shield tunnel
upwarping deformation
3-D numerical analysis
