单层洞桩法较PBA优势及合理开挖顺序模拟分析
摘要:在周边环境复杂的城市中心,为确保自身结构及周边环境安全,暗挖车站施工工法的选择尤为重要。通过介绍洞桩法原理及其常用的传统PBA工法和单层导洞洞桩法的施工步序,对比说明两者是否进行下导洞开挖等方面的区别,可以得出单层洞桩法工法对周边环境影响较小、对地下水处理及保护较好。以北京某单层洞桩法施工的暗挖车站为例,采用FLAC3D进行数值模拟,分析总结不同导洞开挖、不同初支扣拱、不同二衬扣拱顺序对周边地表竖向变形及横向变形的影响,得出最优的导洞开挖、初支扣拱及二衬扣拱顺序。研究可为类似工程设计及施工提供参考。
Abstract:In the urban center with complex surrounding environment, it is particularly important to select the construction method of underground excavation station in order to ensure the safety of its own structure and surrounding environment. By introducing the principle of the tunnel pile method and the construction steps of the conventional PBA method and the single-layer pilot tunnel pile method, and comparing the differences between the two methods in terms of whether or not to excavate the lower pilot tunnel, it can be concluded that the single-layer tunnel pile method has less impact on the surrounding environment and better treatment and protection of groundwater. Taking an underground excavation station constructed by a single-layer tunnel pile method in Beijing as an example, FLAC3D is used for numerical simulation to analyze and summarize the influence of different pilot tunnel excavation, different primary support and arch buckle sequence and different secondary lining arch buckle sequence on the vertical and horizontal deformation of the surrounding surface, and the optimal sequence of pilot tunnel excavation, primary support and arch buckle sequence and secondary lining arch buckle sequence are obtained. The study can provide reference for similar engineering design and construction.
中文标题:
单层洞桩法较PBA优势及合理开挖顺序模拟分析
Numerical Simulation Analysis of the Advantages of Single-story Tunnel Pile Method over Traditional PBA Method and Reasonable Excavation Sequence
作者:
孙玉辉,李晓萌,陈昌彦,白朝旭,王金明
Sun Yuhui,Li Xiaomeng,Chen Changyan,Bai Chaoxu,Wang Jinming
作者简介:孙玉辉,男,1982年生,汉族,河南周口人,硕士研究生,高级工程师,主要从事地铁建设风险管控工作。E-mail:63908264@qq.com
通讯地址:
北京市勘察设计研究院有限公司,北京 100038
BGIEngineeringConsultantsCo.,Ltd.,Beijing100038,China
中图分类号: U 455
doi:10.3969/j.issn.1007-2993.2022.05.003
出版物:岩土工程技术
收稿日期:2021-01-27
网络出版日期:2022-10-08
刊出日期:2022-10-08
关键词:单层导洞洞桩法,PBA,数值模拟,合理开挖顺序
Key words:single-layer tunnel,PBA,numerical simulation,reasonable excavation sequence
文档包含图片数量:图片(7)张
文档包含表格数量:表格(5)个
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