基于凿岩台车钻进速度的隧道围岩基本质量指标计算方法  

Calculation Method for Basic Quality Index of Tunnel Surrounding Rock Based on Penetration Velocity of Drill Jumbo

作　　者：赵思光 王明年[1,2] 罗丽菊 王志龙[1,2] 易文豪 童建军 ZHAO Siguang;WANG Mingnian;LUO Liju;WANG Zhiong;YI Wenhao;TONG Jianjun(Key Laboratory of Transportation Tunnel Engineering,Ministry of Education,Southwest Jiaotong University,Chengdu Sichuan 610031,China;School of Civil Engineering,Southwest Jiaotong University,Chengdu Sichuan 610031,China)

机构地区：[1]西南交通大学交通隧道工程教育部重点试验室,四川成都610031 [2]西南交通大学土木工程学院,四川成都610031

出　　处：《中国铁道科学》2023年第2期83-91,共9页China Railway Science

基　　金：中国国家铁路集团有限公司科技研究开发计划课题(K2020G035,K2021G024)。

摘　　要：为保证隧道施工中岩体识别的准确性,针对冲击-旋转耦合式破岩的凿岩机提出1种基于钻进速度的隧道围岩基本质量指标(BQ)计算方法,包括基于钻进速度的BQ拟合计算式和钻进速度分级模式。首先,从能量角度分析冲击-旋转式凿岩机的破岩机理,推导由钻进参数和BQ值表达的凿岩机破岩功能关系计算式;其次,依托郑万高铁湖北段隧道工程获得92组样本,通过现场试验和室内试验,采集样本的钻进速度和可用于计算BQ值的岩石坚硬程度和岩体完整程度数据;最后,采用数理统计方法建立钻进速度与BQ值之间的关系,并在此基础上提出钻进速度分级模式。结果表明:钻进速度和BQ值之间具有良好的响应关系,当钻进压力一定时,可直接用钻进速度表示围岩BQ值;基于钻进速度的BQ值计算方法,包括中值拟合计算式及可覆盖95%数据的上、下限值计算式;钻进速度分级模式及选择原则可直接用于现场围岩级别的快速判定。In order to ensure the accuracy of rock mass identification in tunnel construction,a calculation method for the basic quality index(BQ)of tunnel surrounding rock based on the penetration velocity(V p)was proposed for the impact-rotation coupling rock-breaking drill,including the BQ fitting calculation formula based on the penetration velocity and the penetration velocity classification mode.Firstly,the rock-breaking mechanism of impact-rotary rock drill was analyzed in light of energy;and the relational calculation formula of rock-breaking function of the rock drill expressed by drilling parameters and BQ values was derived.Secondly,92 groups of samples were obtained based on the tunnel projects of the Hubei section of Zhengzhou-Wanzhou High-speed Railway.Through field and laboratory tests,penetration velocities of the samples and the data of rock strength and rock mass integrity that can be used to calculate the BQ value were collected.Finally,the relationship between the penetration velocity and the BQ value was established through the mathematical statistics method;and on this basis,the classification mode of penetration velocity was proposed.The results show that there is a good response relationship between the penetration velocity and the BQ value.When the drilling pressure is constant,the BQ value of surrounding rock can be directly expressed by the penetration velocity.The BQ value calculation method based on the penetration velocity includes the median fitting calculation formula and the upper and lower limit value calculation formulas that can cover 95%of the data.The classification mode and the selection principle of penetration velocity can be directly used for the rapid determination of the grades of surrounding rock on-site.

关 键 词：隧道施工 围岩基本质量指标 钻进速度 岩石坚硬程度 岩体完整程度 围岩级别 

分 类 号：U452.12[建筑科学—桥梁与隧道工程]