文献类型：期刊文献

中文题名：隧道层状岩体质量评价的BQ分级改进

英文题名：IMPROVEMENT OF BQ CLASSIFICATION FOR LAYERED ROCK MASS QUALITY INDEX IN TUNNEL ENGINEERING

作者：沙鹏[1,2];赵逸文[1];高书宇[1];赵文[3]

机构：[1]绍兴文理学院,土木工程学院,绍兴312000;[2]浙江省岩石力学与地质灾害重点实验室,绍兴312000;[3]中铁第一勘察设计院集团有限公司,西安710043

年份：2020

卷号：28

期号：5

起止页码：942

中文期刊名：工程地质学报

外文期刊名：Journal of Engineering Geology

收录：CSTPCD、、北大核心2017、CSCD2019_2020、北大核心、CSCD

基金：国家自然科学基金重点项目(资助号:41831290);浙江省基础公益研究计划项目(资助号:LQ18D020001)。

语种：中文

中文关键词：BQ分级;层状岩体;结构面产状修正;初始地应力状态修正;隧道工程

外文关键词：BQ classification system;Layered rock;Structural surface shape correction coefficient;Initial ground stress state correction coefficient;Tunnelling;

中文摘要：国标BQ分级方法是一种多因素、多变量、定性与定量结合的分级方法,该方法选取岩石饱和单轴抗压强度和岩体完整性指数计算出岩体基本指标,再考虑到工程岩体现场工况对其修正,既保证了分级的客观性,又降低了现场分级的难度。但在一些复杂地质条件下,如层状岩体等,BQ分级存在修正系数定性评价的局限性。由于现场工程人员的主观判断不同,导致两种岩体分级交界处往往会出现分级交错的现象。基于室内力学试验,本文阐述了层理倾角与围压对层状岩体力学参数的影响规律。采用Jaeger-Donath与Mogi-Coulomb强度准则提出针对层状岩体的结构面产状修正系数K2以及初始地应力状态修正系数K3的计算公式,并通过木寨岭铁路隧道围岩分级计算进行了验证。

外文摘要：The Standard of Engineering Classification of Rock Masses(BQ system)is a classification method of multi-factors,multi-variables,and qualitative and quantitative combination.In this method,we select the rock saturation uniaxial compressive strength and rock integrity index to calculate the value of the rock mass basic quality[BQ].The modification of rock mass is made considering the field conditions of engineering rock mass,which makes BQ classification method ensure the objectivity of classification,and also reduces the difficulty of the scene classification.However,in some complex geological conditions,such as layered rock mass,BQ classification has the limitation of qualitative evaluation of correction coefficient.The actual use of the subjective judgment due to different field engineers,in the junction of two types of rock classifications,often occurs classification phenomenon.This paper expounds the influence law of angle of bedding and confining pressure on mechanical parameters of layered rock mass based on laboratory mechanics test.Jaeger-Donath and Mogi-Coulomb strength criteria are used to propose the calculation formulas of structural surface shape correction K2 and initial ground stress state correction coefficient K3.Finally,we verify the modification by the calculation of surrounding rock classification of Muzhailing railway tunnel.