改扩建高速公路隧道围岩分级研究

Study on Rock Grading of Tunnel Surrounding Rocks in the Expansion and Construction of Highway Tunnels

摘要

通过对比分析《公路工程地质勘察规范》（JTJ064-98）版与（JTG C20-2011）版对隧道围岩分级划分的异同点，发现新老规范中围岩等级并非严格对应关系。新规范对同级别围岩质量要求更高，并且采用定性与定量相结合的方法来确定围岩分级，使得新规范在围岩评价方面更加合理。收集分析既有隧道的勘察设计、施工、监测等资料，其反映的地质条件变化，对改扩建高速公路隧道勘察工作量布置与隧道围岩分级划分均有指导意义。以某高速公路为例，通过改扩建隧道围岩分级与既有隧道实际围岩类别对比。在分析既有隧道资料的基础上，采用地质调绘、钻探、物探等互相验证的勘察方法划分的围岩级别与实际更相符。本文总结了改扩建工程隧道勘察技术及围岩分级注意点可供类似项目参考。

Abstract

By comparing and analyzing the differences and similarities between the classification of tunnel surrounding rock in “Code for Geological Investigation of Highway Engineering (JTJ064-98)” and “(JTG C20-2011)”, it is found that the classification of surrounding rock in the new and old specifications does not strictly correspond one-to-one. The new specification has higher requirements for the quality of surrounding rock at the same level, and a combination of qualitative judgment and quantitative calculation is used to determine the classification of surrounding rock, which is more reasonable.The collection and analysis of existing tunnel survey, design, construction, monitoring and other data reflect the changes in geological conditions. This has a guiding significance for the layout of survey work and rock classification in the construction and expansion of highway tunnels.Taking a certain expressway as an example, the classification of surrounding rock in tunnel expansion and reconstruction is compared with the actual category of surrounding rock in existing tunnels. Based on the analysis of existing tunnel data, the classification of surrounding rock divided by geological mapping, drilling, geophysical exploration and other mutually verified survey methods is more consistent with reality.This article summarizes the tunnel surveying technology and rock mass classification points for the reconstruction and expansion project, which can be used as a reference for similar projects.

关键词

改扩建 / 隧道围岩 / 勘察规范 / 物探

Key words

reconstruction and expansion / tunnel surrounding rock / survey specification / geophysical prospecting

参考文献

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