大跨新黄土公路隧道支护设计与施工技术研究

Support Design and Construction Technology for Large Span Highway Tunnel in New Loess Zone

基于G1816国家高速公路兰州新区至兰州段大跨新黄土隧道的地质特性,结合对同类型隧道设计支护参数取值的调研,采用工程类比法和数值模拟分析法,综合确定适合该项目的黄土隧道支护参数,并针对大跨黄土隧道施工过程中出现的拱顶沉降变形、湿陷性影响、黄土陷穴和地表裂缝等问题提出了相应的处治措施。

Based on the geological characteristics of the large span new loess tunnel on G1816 from Lanzhou new urban to Lanzhou city,combined with the research on the design support parameters of the same type of tunnel,this paper adopts the methods of engineering analogy method and numerical simulation analysis to design the supporting parameters suitable for the project. In addition,some related measures are put forward to treat the problems about the arch settlement,collapsibility,loess depression,surface cracks,and so on. This research will provide reference for similar projects.