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Construction Technology for Large Cross Section Loess Tunnel with Two-Stage and Four-Step Excavation Method
Author(s): 
Pages: 109-112
Year: Issue:  z1
Journal: RAILWAY STANDARD DESIGN

Keyword:  郑西客运专线大断面隧道黄土隧道二台阶四步开挖法;
Abstract: 凤凰岭隧道是郑西铁路客运专线工程试验段唯一一座隧道,也是郑西客运专线第一座开工的隧道工程,大断面黄土隧道的施工技术成了客运专线建设的重点和难点.随着隧道施工的逐步推进,根据隧道的围岩量测结果,结合新奥法施工设计原理,对隧道原采用三台阶七步开挖法进行优化后采用二台阶四步开挖法进行施工,有效缩短施工循环长度及封闭时间,在保证施工安全的前提下,施工进度得到很大提高,产生很好的经济效益和社会效益.
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