一种改进的公路岩质隧道围岩分级方法  

An Improved Method for Classifying Surrounding Rock of Highway Rock Tunnels

作　　者：王坛华 WANG Tanhua(Fujian Communications Planning and Design Institute,Fuzhou 350004,China)

机构地区：[1]福建省交通规划设计院有限公司,福建福州350004

出　　处：《厦门理工学院学报》2023年第3期67-73,共7页Journal of Xiamen University of Technology

基　　金：福建省自然科学基金项目(2021J05026)。

摘　　要：为克服传统隧道围岩分级方法在实际应用中存在的成本高、效率低、参数不易取值等问题,引入一种基于电法勘探成果应用的改进围岩分级方法。在岩体修正质量指标计算式的主要参数和修正系数取值问题分析的基础上,利用隧道物探电阻率值与地下水发育、岩体完整性相关性强的原理,提出根据电阻率大小关系调整完整性系数、地下水影响修正系数的折减方法,建立了改进[BQ](岩体修正质量指标)的隧道围岩分级计算法。厦沙高速某隧道的算例分析表明,采用本文提出的改进计算法,[BQ]计算值较之现行规范计算法降低约5%~8%,与工程实际基本吻合,可实现隧道勘察降本增效,且参数易取值,可操作性强。To deal with the high cost,low efficiency and difficult parameter selection of the traditional methods for tunnel surrounding rock classification,an improved surrounding rock classification method based on results of electrical exploration is introduced.Analyzing the main parameters with values of correction coefficient in the calculation formula for rock mass correction quality indicators,and utilizing the principle of strong correlation between tunnel geophysical resistivity values and groundwater watery and rock mass integrity,a reduction method for adjusting the integrity coefficient and groundwater impact correction coefficient depending on resistivity values is proposed,and an improved[BQ](rock mass correction quality indicator)classification calculation method for tunnel surrounding rock established.Calculation of a tunnel on Xiasha Expressway shows that using the improved calculation method proposed in this article,the calculated value of[BQ]is reduced by about 5%-8%compared to the current standard calculation method,which is basically in line with engineering practice.The improved method achieves cost reduction and efficiency increase in tunnel exploration with easy valuing of parameters and good operability.

关 键 词：公路岩质隧道 围岩分级方法 岩体修正质量指标([BQ]) 饱和抗压强度 完整性系数 大地电磁测深 电阻率 

分 类 号：U452.1[建筑科学—桥梁与隧道工程]