基于地质雷达法的隧道衬砌背后脱空定量解释研究
Quantitative Interpretation of the Size of Voids Behind Tunnel Lining Detected by Geological Radar Method
李海 1柴子贺1
作者信息
- 1. 中铁工程设计咨询集团有限公司,北京 100055
- 折叠
摘要
隧道衬砌对隧道结构质量起决定性作用,施工过程中若能及时发现缺陷并采取整治措施,则可以大幅提高隧道的安全性.目前,隧道质量控制多采用传统的检验方法,即目测、开孔或开槽取样验证,这种方法不仅效率低,而且难以得到指标,故采用先进仪器设备对隧道衬砌质量进行无损检测,再利用定量化指标来评价隧道整体状况十分必要.研究表明,通过测定隧道衬砌混凝土的某些物理参数(如电磁波速度、介电常数等),可以用于计算隧道衬砌混凝土的几何尺寸及分析衬砌背后的回填情况,并为隧道衬砌质量评价提供数据支撑.研究结果表明,这种方法有效避免打孔、开槽取样等对衬砌混凝土的破坏,也减少了仅通过外观评价隧道衬砌混凝土的质量的局限性,对确保隧道安全意义重大.
Abstract
The rapid development of high-speed railways has led to the construction of a large number of tunnel projects.The quality of tunnels depends on the quality of tunnel lining.If defects,especially hollow defects,can be detected in a timely manner during tunnel construction and remedial measures can be taken,it can greatly improve the safety of tunnels in future railway operations.Therefore,it is necessary to conduct non-destructive testing of tunnel lining to discover voids and calculate the size of the voids.Previously,traditional inspection methods such as visual inspection,hole opening,or slot sampling verification were often used for tunnel quality control,which not only had low efficiency but also lacked quantitative indicators.Therefore,it is necessary to use advanced instruments and equipment for non-destructive testing of the lining quality of the tunnel,and to evaluate the overall condition of the tunnel using quantitative indicators through scientific analysis of testing data.This article analyzed the theoretical basis of electromagnetic wave propagation and the intensity of electromagnetic wave reflection and transmission,determined the dielectric constant of electromagnetic wave propagation in concrete,and used formulas to obtain the size of voids in the vertical direction,which was verified through drilling.By measuring the physical parameters of certain tunnel lining concrete,such as electromagnetic wave velocity,dielectric constant,etc.,the geometric size of tunnel lining concrete could be calculated and the backfill situation behind the lining could be analyzed,and the quality of tunnel lining could be scientifically evaluated.This method effectively avoids the damage to the lining concrete caused by drilling,slotting,sampling and verification,and also eliminates the need to evaluate the quality of tunnel lining concrete solely through visual inspection.It can quickly and accurately identify hidden dangers in tunnel lining and is of great significance for ensuring the safety of future driving.
关键词
铁路隧道/衬砌/地质雷达/空洞/定量化指标/介电常数Key words
railway tunnel/lining/ground penetrating radar/voids/quantitative indicators/dielectric constant引用本文复制引用
出版年
2024
NETL
NSTL
万方数据