复杂环境下洞桩法地铁车站设计关键技术研究

Research on the Key Technique of Subway Station Design with Hole-pile Method under Complex Environment

研究目的:本文依据北京地区的环境特点及洞桩法的工艺特征,对洞桩法设计中施工竖井设置方式、横通道设置方式、导洞设计、钢管桩设计、扣拱设计等进行系统研究,从设计方面进一步总结探讨洞桩法的应用边界条件,在设计及施工中进一步研究发掘关键技术及重点措施,总结出一套洞桩法的综合技术,以便为今后类似的地铁工程建设提供参考。研究结论:(1)洞桩法的核心思想在于尽快形成竖向承重结构,整体工法理念优势明显;(2)洞桩法施工灵活,施工基本不受层数、跨数的影响,且对周边环境具有良好的适应能力,特别适合于复杂环境下暗挖地铁车站的施工,目前已经成为软土地区暗挖地铁车站的主流工法;(3)目前关于洞桩法的设计及施工方面的系统研究仍然滞后,同类工程参数的选取差异较大,需要进行深入研究;(4)本研究成果可为今后复杂环境下洞桩法地铁车站的设计与施工提供借鉴。

Research purposes ： According to the area environment characteristics of Beijing and process characteristics of hole - pile method,this paper aims at the construction shaft setting mode,cross channel setting mode,pilot tunnel design,steel pipe pile design,buckle arch design for a systematical study of hole - pile method,further explores the hole - pile method application of boundary conditions in terms of design,further researches to explore the key technology and key measures in design and construction of beijing subway station, sums comprehensive technical guidance of the hole - pile method up,in order to provide a reference for future similar metro engineering construction. Research conclusions：（1） The main idea of hole - pile method is forming vertical bearing structure as soon as possible. （2） Hole - pile method has the advantages of flexibility,good adaptability,which is suitable for the undercut subway station construction under complex environment. （ 3 ） Systematic research of hole - pile method design and construction is hysteretic,which needs to be further researched. （4） The results of this paper can provide reference for the subway station design with hole - pile method under complex environment.