摘要
针对福建省漳永高速公路上坪格隧道塌方案例,文章在分析其塌方机理的基础上提出了相应的工程处治措施,并采用荷载-结构法对变更后塌方段初期支护和二次衬砌强度进行了验算。分析结果表明:不良地质、较差施工质量和不合理开挖工法是导致隧道塌方的主要原因;在塌方荷载作用下,初期支护和二次衬砌弯矩较大值发生在拱顶、左右拱腰、左右拱脚和仰拱部位,这些部位在施工中应给予足够的重视;初期支护危险截面的最小安全系数为1.93。二次衬砌危险截面的最小安全系数为2.43。均大于国家隧道规范规定值,满足工程安全性要求。
Regarding a collapse event in the Shangpingge tunnel in Fujian province, corresponding treatment mea- sures were proposed based on an analysis of the causes, and the strengh of the primary and secondary lining were verified after alteration using the load-structure method. It was concluded that unfavorable geological conditions, bad construction quality and an unsuitable excavation method are the major reasons for the tunnel collapse; a large bending moment of the primary and secondary lining occurs at the tunnel crown, haunch, arch foot and invert under the effect of the collapse load, and special attention should be paid to these postions during tunnel construction; and the minimum safety factor is 1.93 for dangerous cross-sections of the primary support and 2.43 for the secodary lin- ing, which are larger than the values specified by the natioanl tunnel code, therefore meeting the requriements of en- gineering safety.
出处
《现代隧道技术》
EI
CSCD
北大核心
2017年第1期191-197,共7页
Modern Tunnelling Technology
关键词
隧道
塌方
荷载-结构法
初期支护
二次衬砌
安全系数
Tunnel
Collapse
Load-structure method
Primary support
Secondary lining
Safety factor
