浅析超大断面黄土隧道围岩与衬砌相互作用

 贺维庚

(陕西高速公路工程咨询有限公司,陕西 西安710061

  要:通过对现有隧道的围岩与衬砌相互作用分析,提出了实测复合式衬砌二次衬砌与初期支护压力分配系数G0的定义,并对围岩压力、初衬与二衬接触压力进行统计分析,得出超大断面黄土隧道二次衬砌接触压力比初期支护围岩压力都要小,拱顶处二衬的分担比例大约在0~20%左右,拱肩处大约在20~60%左右,拱脚处大约在60~100%之间。研究显示超大断面黄土隧道二衬是受力的,而且受力很大。

关键词:黄土隧道;围岩压力;监控量测

中图分类号:U456        文献标识码:A

Analysis of Super Large Cross Section of the Loess Tunnel

Surrounding Rock and Lining Interaction

HE Wei-geng

Shaanxi Expressway Engineering Consulting Co., LTD. Xi’an 710061China

Abstract:By analyzing the interaction between surrounding rock and lining of existing tunnels, the paper raised the definition about pressure distribution coefficient G0 of secondary lining and primary support, statistical analyzed the surrounding rock pressure and contact pressures between primary and secondary linings. The results showed that secondary lining contact pressure was less than primary surrounding rock pressure, distribution proportion of vault secondary lining is about 0~20%, at spandrel is about 20~60%, at arch springing is about 60~100%, the average pressure shared by secondary lining is nearly 84 7%, which showed the secondary lining of loess highway tunnel with large cross section is weighted, and the force was large.

key words: Loess highway tunnelsurrounding rock pressuremonitoring measurement.