Abstract
The paper describes experimental activity carried out at the Department of Railway Engineering and Track Management of the Faculty of Civil Engineering, University of Žilina. It focuses on monitoring moisture changes in individual structural layers of the railway track body and its subgrade, performed on the railroad model, (1:1 scale). The Introduction characterizes the experimental stand models of the Department, used for monitoring the moisture changes in the structural layers. The second part of the paper focuses on the characteristics of the moisture determination method - time reflectometry (TDR method), and on the calibration of TRIME PICO IPH T3 probes for real materials of the experimental stand DRETM (crushed aggregate, fr. 0 / 31.5 mm - protective layer, crushed aggregate, fr. 0/63 mm - embankment, clay with the addition of river gravel – foundation). The calibration was a substantial prerequisite for the subsequent humidity monitoring of the railway models. The next part of the paper presents the recorded moisture values of the structural layer materials, built in the measuring profiles of the experimental stand DRETM, measured before and during the winter period 2017/2018. The Conclusion evaluates the measured values and the determination of the input moisture values that will be used for the numerical modeling of the thermal regime of subgrade structure by the SoilVision software.
Highlights
The Department of Railway Engineering and Track Management (DRETM) of the Faculty of Civil Engineering (FCE), University of Žilina (UNIZA), has been dealing with the problem of non-traffic load on the subgrade structure since 2003
The second part of the paper focuses on the characteristics of the moisture determination method - time reflectometry (TDR method), and on the calibration of TRIME PICO IPH T3 probes for real materials of the experimental stand DRETM
The Conclusion evaluates the measured values and the determination of the input moisture values that will be used for the numerical modeling of the thermal regime of subgrade structure by the SoilVision software
Summary
The monitoring of the moisture regime of the subgrade structure of the Experimental stand DRETM, ( in the first two measuring profiles – embankment), has been carried out since 2014, using the measuring probes PICO PROFILE As these moisture measuring probes were primarily constructed for permanent installation, which was not possible due to the number of measuring spots, in 2016 they were mechanically damaged due to frequent manipulation. The moisture measuring of subgrade structure is conducted in 6 measuring lines altogether, where 19 protecting pipes of measuring probes are embedded Out of this number, 13 protecting pipes are placed in the embankment body of railway track The individual measuring profiles of the Experimental stand DRETM, (structural layers of the subgrade structure), are primarily built of coarse grain materials. The calibration itself, as well as the subsequent field measurement, ran smoothly and quickly, thanks to the possibility of connecting the probe to the HD2 reader. (It was not necessary to connect it to the external PC)
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
