地铁车站密贴下穿施工地面及既有车站沉降规律研究
许明杨1,2王海涛2田江涛2张志伟3尤强3
Research on the Settlement Law of the Ground and Existing Stations in the Close Under-crossing Construction of Subway Station
XU Mingyang1,2WANG Haitao2TIAN Jiangtao2ZHANG Zhiwei3YOU Qiang3
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作者信息:1.辽宁科技学院资源与土木工程学院，117004，本溪
2.大连交通大学土木工程学院，116028，大连
3.中铁十四局集团隧道工程有限公司，250002，济南
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Affiliation:1.School of Resources and Civil Engineering, Liaoning Institute of Science and Technology, 117004, Benxi, China
2.School of Civil Engineering, Dalian JiaoTong University, 116028, Dalian, China
3.China Railway No.14 Group Corporation Tunnel Engineering Co., Ltd., 250002, Jinan, China
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Key words:
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DOI:10.16037/j.1007-869x.2024.10.012
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中图分类号/CLCN:TU921；U231.4；U455.46
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栏目/Col:研究报告
摘要:
［目的］随着城市地下空间开发利用向立体化、多维化方向推进，城市轨道交通的上跨下穿工程日益增多。其中，大断面新建车站密贴下穿施工对周边环境影响显著，因此，亟须对采用洞桩法施工的新建车站密贴下穿既有车站过程中的地面沉降及既有车站的变形规律进行深入研究。［方法］基于北京地铁6号线苹果园站密贴下穿既有地铁1号线苹果园站的实际工程案例，本研究采用数值模拟方法，分析了地面沉降与既有车站变形的规律。通过对比实际监测数据，进一步验证了施工过程中地面沉降与既有车站变形的实际情况，并将数值模拟结果与实测数据进行了对比分析。［结果及结论］洞桩法施工的导洞开挖阶段及二次衬砌扣拱阶段是地面沉降和既有结构变形的最不利阶段。在二次衬砌扣拱施工完成后，地面沉降和既有结构变形均出现回弹现象。此外，既有车站的刚度对上方地面沉降有显著的抑制作用，表现为重叠段地面沉降值小于非重叠段。洞桩法施工引起的新建车站对既有车站结构的变形主要为刚体位移，而对轨道结构的变形则主要为倾覆变形，局部表现为刚体位移。
Abstracts:
［Objective］ As the development and utilization of urban underground space advances towards the three-dimensional and multi-dimensional direction, there are more and more over-crossing and under-crossing urban rail transit projects. Among them, the close under-crossing construction of new stations with large cross-section has a significant impact on the surrounding environment. Therefore, it is urgent to carry out an in-depth study on the ground settlement and deformation law of existing stations during the new station construction process closely under-crossing existing stations by Pile-Beam-Arch (PBA) method. ［Method］ Based on the actual engineering case of Beijing Metro Line 6 Pinguoyuan Station, which closely under-crosses the existing station with same name on Metro Line 1, the law of ground settlement and deformation of the existing station is analyzed by adopting numerical simulation method in the study. By comparing the actual monitoring data, the actual situation of ground settlement and deformation of the existing station during the construction process is further verified, and the numerical simulation results are compared and analyzed with the measured data. ［Result & Conclusion］ The most unfavorable stages for ground settlement and existing structure deformation are the guide hole excavation stage and the second lining arch stage of PBA method. After the completion of second lining arch construction, both the ground settlement and the deformation of the existing structure show rebound phenomenon. In addition, the stiffness of the existing station has a significant inhibiting effect on the ground settlement above, which is manifested in the fact that the ground settlement value of the overlapping section is smaller than that of the non-overlapping section. The deformation of the existing station structure caused by new station constructed with PBA method is mainly the rigid body displacement, while it caused track structure deformation is mainly the overturning deformation, which is locally manifested as rigid body displacement.
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