新旧公路隧道围岩分级方法的比较

Comparison of the New and Old Surrounding Rock Mass Classification Criteria

随着我国经济建设的发展,公路隧道,尤其是高速公路隧道和一、二级公路隧道的建设越来越普遍,并且呈现数量多、埋藏深、长度大的特点。因此,对隧道进行超前地质预报和围岩分级也就显得越来越重要,目前我国交通部编写的规范中详细介绍围岩分级的主要有《JTJ 064-98公路工程地质勘察规范》和《JTG D70-2004公路隧道设计规范》。以沪蓉西高速公路扁担垭隧道为例,对新旧两种公路隧道围岩分级规范进行了比较,分析了新旧规范在此隧道中的适用性,探讨了其各自的特点、不足和今后围岩分级的发展方向。

With the development of economic construction of China, highway tunnels are constructed more than ever, especially those on the express highway, first and second class highways. These tunnels are getting longer and deeper with large amount. Thereupon tunnel construction integrative geology prediction and surrounding rock mass classification become more important. Up to now 《Specifications for Survey of Highway Engineering Geology》（JTG D70-2004）and 《Code for Design of Road Tunnel》（JTJ 064-98） are the main specifications which introduce surrounding rock mass classification in detail and published by the Ministry of Communications of China. With Biandanya tunnel project on Hurongxi express highway as an example, the new and old surrounding rock mass classification criteria of highway tunnels are compared, with their applicability to this tunnel analyzed, their features and defects discussed and their development trend highlighted.