Application and Research of Geologic Radar in Groundwater Disease of Tunnel Engineering Inspection

Abstract

In order to diagnose the disease degree of operation tunnels and to estimate tunnel's security condition, this paper analyzes the causes of bugs existing behind the tunnel lining, expounds the theory and method of making non-destructive test on tunnel lining quality by using Geological Radar. By processing and analyzing field data, the following functions can be performed, such as detecting the thickness of concrete lining accurately, determining the distribution position and quantities of rebar and grid steel, searching existed cavity and uncompacted area behind the lining especially lining arch top. We also apply the method of morphology to the extraction of liner image feature. We get the liner boundary line and waterlogging area more intuitively by wavelet analysis, and find the anomalous point in the liner. It has been proved that Geologic Radar is a feasible method to inspect the structure of tunnel concrete lining. A dopting hole-drilling method to make verifications with detecting results of geological radar, the results of the two kinds of methods have not big difference.

Deformation of the Zhangjiazhuang high-speed railway tunnel: an analysis of causal mechanisms using geomorphological surveys and D-InSAR monitoring

“…Gattinoni (2019) studied the influence of deep-seated gravitational slope deformation on tunnels, and Zhang et al (2015) studied the mechanical conditions of landslides induced by tunnel excavation. Various research methods are being used to analyse the relationship between landslides and tunnels, including detailed geological and geomorphic investigation, three-dimensional numerical simulation, surface deformation monitoring based on InSAR technology, and GPS/GNSS monitoring (Tang et al 2013;Singh et al 2014;Troncone et al 2014; Barla et al 2015;Nikadat et al 2015;Zhang et al 2015;Komu et al 2020). InSAR technology, a highprecision remote sensing monitoring method provides capabilities for monitoring surface movement (Flessandro et al 2001;; however, surface movement monitoring alone may not be sufficient to explain the underlying mechanism of slope deformation.…”