期刊论文

Supporting Structure Design Method for the Shallow-buried Section of a Mountain Tunnel by Covered Excavation

中文

中国公路学报

1001-7372

2019

32

12

217-226

10.19721/j.cnki.1001-7372.2019.12.022

国家自然科学基金项目(51878071) 宁波市交通委科技计划项目(201503) 湖南省研究生科研创新项目(CX20190670).

本校为第一机构

山岭隧道的进出口或穿越峡谷地区常存在浅埋段,如何在保证安全的前提下经济、高效地完成隧道开挖支护施工成为工程建设的关键问题,兼具明挖与暗挖优点的盖挖法已初步应用于山岭隧道浅埋段,但其支护设计方法尚需完善。为此,基于山岭隧道浅埋段盖挖施工特点及其盖拱几何模型,首先提出盖拱承载受力简化分析模型;其次,采用结构力学方法建立出盖拱支护结构内力简化计算方法,获得盖拱安全厚度确定方法,并考虑盖拱与拱脚过渡段的平滑缓和作用,构建出拱脚扩大基础的承载力与稳定性分析方法;然后,采用所建立的盖挖支护设计方法探讨隧道埋深、盖拱矢高、圆心角、半径与拱脚宽度等因素对盖拱支护结构承载特...

A mountain tunnel often has shallow-buried sections at the entrance,exit,or in the region where it passes through the canyon.Completing tunnel excavation in an economical, effective,and safe manner has become a key consideration in engineering construction.The covered excavation method,which has the advantages of the open-cut method and subsurface excavation method,has been employed for shallow-buried sections of mountain tunnels. However,supporting structure design for the covered arch still needs to be improved.Therefore, first,a simplified b...