文献类型：期刊文献

中文题名：隧道初支合理支护时机确定方法及其工程应用

英文题名：Determination method and engineering application of reasonable installation timing of the initial ground support

作者：梁鹏 高永涛 周喻 邓代强

第一作者：梁鹏

机构：[1]北京科技大学土木与资源工程学院,北京100083;[2]北京科技大学金属矿山高效开采与安全教育部重点实验室,北京100083;[3]湘潭大学土木工程与力学学院,湘潭411105;[4]贵州理工学院矿业工程学院,贵阳550003

第一机构：北京科技大学土木与资源工程学院,北京100083

年份：2022

卷号：44

期号：2

起止页码：265-276

中文期刊名：工程科学学报

外文期刊名：CHINESE JOURNAL OF ENGINEERING

收录：CSTPCD;;EI(收录号：20220111420852);Scopus;北大核心:【北大核心2020】；CSCD:【CSCD2021_2022】；

基金：中央高校基本科研业务费专项资金资助项目(FRF-TP-18-016A3);国家自然科学基金资助项目(51504016,51764009);贵州省科技支撑计划资助项目(黔科合支撑[2018]2836)。

语种：中文

中文关键词：隧道工程;支护时机;破坏接近度;应变软化特性;数值模拟

外文关键词：tunnel engineering;supporting time;failure approach index;strain-softening behavior;numerical simulation

摘要：将岩体破坏接近度指标(FAI)引入隧道支护设计,明确了围岩临界支护时机判别准则.基于有限差分数值计算程序,合理考虑岩体峰后应变软化特性,建立了一种隧道最优支护时机确定方法.通过算例分析,定量探讨了表征支护时机的重要参数,从工程角度阐释了支护时机的本质意义.结果表明:岩体地质强度指标GSI由75减小至25时,支护时机提前8.32 m;岩石材料常数mi由20减小至10时,支护时机提前5.85 m;岩石单轴抗压强度σci由80 MPa减小至40 MPa时,支护时机提前3.74 m;工程扰动参数D由0增加至0.8时,支护时机提前7.44 m.将建立方法在玉渡山隧道工程中进行应用,计算出研究区段的支护时机为3.3 m,经现场监测表明该方法有效、可行.该研究成果可为隧道支护体系的量化设计提供参考.
The surrounding rock support is a key issue in tunnel construction.The reasonable supporting time can not only ensure the safety of tunnel construction but also achieve the purpose of saving support costs.Currently,the support time determination mainly depends on on-site monitoring information and engineering experience,and there is still a lack of effective quantitative design methods.To overcome this deficiency,systematic research was conducted based on the case project of the Yudushan tunnel in the Yan-Chong expressway.The failure approach index was introduced in the tunnel support design,and the criterion of critical surrounding rock supporting time was defined.Based on the finite difference numerical calculation program and reasonable consideration of the post-peak strain softening characteristics of the rock mass,a method for determining an optimal tunnel supporting time was established.Through the analysis of numerical examples,the important parameters characterizing the supporting time were discussed quantitatively,and the essential significance of the supporting time was revealed from the engineering perspective.The results show that the supporting time increases by 8.32 m as the geological strength index is reduced from 75 to 25;the supporting time increases by 5.85 m as the intact rock material property,mi,is reduced from 20 to 10;the supporting time increases 3.74 m as the uniaxial compressive strength of rock,σci,is reduced from 80 to 40 MPa;the supporting time increases by 7.44 m as the engineering disturbance coefficient,D,is increased from 0 to 0.8.The proposed method was applied in the Yudushan tunnel project.The supporting time of the research section is 3.3 m.Field monitoring shows that the method is effective and feasible and provides a reference for the tunnel support system’s quantitative design.