黄河中下游超深盾构工作井基坑变形警情分析
闫文博1刘燕2,3刘俊岩2,3皇甫帅帅2邵玉婷4
Deformation Alarm Analysis of Ultradeep Shield Working Shaft Foundation Pit in Yellow River Middlelower Reaches
YAN WenboLIU YanLIU JunyanHUANGFU ShuaishuaiSHAO Yuting
-
作者信息:1.黄河勘测规划设计研究院有限公司， 250003， 郑州
2.济南大学土木建筑学院， 250022， 济南
3.山东省城市地下工程支护及风险监控工程技术研究中心， 250022， 济南
4.山东省土木建筑学会， 250002， 济南
-
Affiliation:Yellow River Engineering Consulting Co., Ltd., 250003, Zhengzhou, China
-
关键词:
-
Key words:
-
DOI:10.16037/j.1007-869x.2023.12.017
-
中图分类号/CLCN:TU49+2
-
栏目/Col:研究报告
摘要:
目的：为了充分把握黄河中下游超深工作井基坑的变形控制，应充分关注施工流程与支护结构的关系，安排合理的施工工序，以丰富沿岸地区特殊地层结构基坑的施工经验。方法：基于济南市某穿黄河隧道工程超深盾构工作井基坑,从开挖期监控测量出现的几次预警信息入手，结合基坑围护结构设计和复杂的施工流程安排，分析基坑施工过程中出现的围护墙深层水平位移和内力报警原因，并提出了可采取的应对措施。结果及结论：施工流程的安排应统筹端头加固、坑深变化及支护刚度变化位置，应重视施工引起的坑顶荷载等工况及相互间组合因素的影响，合理安排施工工序。支撑架设、端头加固与基坑开挖工况叠合及坑边超载等是造成基坑变形和支撑轴力报警的主要原因；支护刚度变化处的支撑轴力报警的主要原因是支撑受端头井开挖工况和开挖进度的影响较大，而不取决于标准段的施工工况。因此，应重视端头段与标准段的支护结构转换处支护刚度加强的必要性。
Abstracts:
Objective: To comprehensively control the deformation of ultradeep working shaft foundation pits in Yellow River middlelower reaches, it is crucial to focus on the relationship between construction process and support structures, which involves arranging rational construction sequences to enrich the construction experience in foundation pits in river bank areas with special geological structures. Method: Based on the ultradeep shield working shaft excavation pit of a tunnel project crossing Yellow River in Ji’nan, starting with the several earlywarning messages detected during the excavation period, combining the foundation pit retaining structure design and the complex construction process arrangement, an analysis is conducted on the causes of diaphragm wall deepseated horizontal displacement and internal force alarms during the foundation pit construction process, and corresponding countermeasures are provided. Result & Conclusion: The construction process should coordinate the reinforcement of tunnel face, changes in pit depth and changes in support stiffness. Attention should be given to the influence of working conditions such as excavationinduced pittop loads and the combination of factors between working conditions, so that construction procedures are reasonably sorted. Support installment, tunnel face reinforcement, the overlay of excavation working conditions, and edge overload are the main causes of foundation pit deformation and supporting axial force alarms. The main reason for axial force alarms at locations with changing supporting stiffness is the significant impact of tunnel face shaft excavation working conditions and progress, independent of the construction conditions of the standard section. Therefore, the necessity of reinforcing the supporting stiffness at the transition between the tunnel face section and the standard section should be emphasized.
- 上一篇: 地铁深基坑硬化土模型参数敏感性研究
- 下一篇: 西宁市河谷带型城市轨道交通线网规划优化研究
过刊浏览
资料下载
友情链接