摘要
多洞空间小净距隧道支护结构参数量化设计与安全性分析是当前设计中的一大难题。文章针对深圳机荷高速公路荷坳隧道四洞小净距段的设计,采用总安全系数法对四洞的开挖与支护模式、各洞的开挖顺序及支护参数进行了研究比较,并采用隧规荷载-结构法、增量法、地层-结构法对支护结构的安全系数进行了对比计算,得出以下结论:(1)提出了基于总安全系数法原理的多洞空间小净距隧道设计方法;(2)根据总安全系数法得出了荷坳隧道四洞小净距段应采用“先行洞二次衬砌完成后再开挖下一孔隧道”的开挖与支护模式,且应按洞1→洞2→洞3→洞4的开挖顺序施工;(3)隧规荷载-结构法、增量法、地层-结构法虽无法得出结构的总承载安全系数,但在一定程度上可以反应部分支护结构的安全性。
The quantified design of parameters and safety analysis of the support structure of a spatially smallspaced multi-tube tunnel are the major difficulties in the current design.In view of the design of the spatially smallspaced four-tube section of He′ao Tunnel on the Bao′an International Airport-He′ao Expressway of Shenzhen,the total safety factor method is adopted to conduct the research and comparison of excavation and support modes of four tubes,excavation sequences of various tubes and support parameters.The load-structure method specified in the tunnel design code,incremental method and ground-structure method are used to compare and calculate the safety coefficients of the support structure.The conclusions are as follows:(1)the design method of spatially small-spaced multi-tube tunnel is put forward based on the principle of total safety factor method;(2)according to the total safety factor method,the spatially small-spaced four-tube section of He'ao Tunnel shall adopt the excavation and support mode that"the secondary lining of the first tube should be fully completed before excavation of the next tunnel tube",and following the excavation sequence during construction:Tube 1→Tube 2→Tube 3→Tube 4;and(3)the tunnel code specified load-structure method,incremental method and ground-structure method cannot get the total bearing safety coefficient of the structure,but it can reflect the safety of some support structure to some extent possible.
作者
肖明清
徐晨
郑强
彭长胜
XIAO Mingqing;XU Chen;ZHENG Qiang;PENG Changsheng(China Railway Siyuan Survey and Design Institute Group Co.,Ltd.,Wuhan 430063;National-Local Joint Engineering Research Center of Underwater Tunnelling Technology,Wuhan 430063)
出处
《现代隧道技术》
CSCD
北大核心
2022年第2期1-10,共10页
Modern Tunnelling Technology
基金
中国国家铁路集团有限公司科技研究开发计划重大课题(K2020G035)
中国铁建股份有限公司科研计划(2021-B18)
铁四院科技计划(2021K038).
关键词
四洞小净距隧道
总安全系数法
支护参数
荷载-结构法
增量法
地层-结构法
Spatially small-spaced four-tube tunnel
Total safety factor method
Support parameter
Load-structure method
Incremental method
Ground-structure method
