摘要
为研究双线盾构下穿过程诱发地表沉降的规律及上部古城墙的变形特征,依托地铁4号线区间隧道下穿和平门古城墙工程,通过数值模拟和现场测试手段对沉降及加固效果进行分析。结果表明:在袖阀管注浆加固及门洞钢拱架支护等作用下,城墙地基区域地表沉降值减小4mm,城墙结构沉降减小约2.2mm,避免了地基局部隆起过大和倾斜率超限;城墙地基区域加固工况下地表横向沉降曲线为宽而浅的单峰沉降槽,未加固工况下表现为窄而深的双峰沉降槽;左、右线隧道施工存在相互影响,且变形稳定后右线隧道地表沉降峰值大于左线。现场实测与数值计算的结果吻合良好,分析方法和研究结果可为日后黄土地区类似的盾构穿越工程提供有益的参考。
To investigate the ground surface subsidence induced by double line shield tunneling and the de- formation characteristics of the upper wall ancient buildings, numerical simulation and field monitoring were employed based on the interval of Metro Line 4 tunnel beneath the Hepingmen ancient city wall pro- ject. The results indicate that due to the sleeve valve pipe grouting reinforcement and the steel arch sup- porting role, the settlement of the ground surface of the city wall decreases by 4 mm compared with that of the unreinforced condition. Wall structure is reduced by about 2.2 mm, which avoids too large wall founda- tion local uplift and the tilt rate. After taking the reinforcement measures, the ground settlement displays wide and shallow single-peak curve. Otherwise it is a narrow and deep double-peak curve. There is mutual influence between the left and right line tunnel construction, and the peak value of the ground surface set- tlement of the right line tunnel is larger than that of the left line after deformation and stability. The field monitoring data agree with the numerical results, and analysis method and results can provide useful refer- ence for the construction of shield tunnel in loess area.
出处
《解放军理工大学学报（自然科学版）》
EI
北大核心
2017年第3期255-262,共8页
Journal of PLA University of Science and Technology(Natural Science Edition)
基金
陕西省科技厅社会发展科技攻关项目(2016SF-412)
中央高校基本科研业务费专项资金资助项目(310821172004
310821165011
310821153312)
关键词
西安地铁
城墙
现场实测
数值模拟
袖阀管注浆
Xi＇an Metro
city wall
field monitoring
numerical simulation
grouting with sleeve valve pipe
