Quantitative Interpretation of the Size of Voids Behind Tunnel Lining Detected by Geological Radar Method
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.
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