Usage of digital image correlation in assessment of behavior of block element pavement structure

Resilient and Safe Road Infrastructure

土木建筑工程

Grygierek, M.^1 ; Grzesik, B.^1 ; Rokitowski, P.^1 ; Rusin, T.^2

Silesian University of Technology, Gliwice, Poland^1

Dantec Dynamics GmbH, Ulm, Germany^2

关键词: D. digital image correlation (DIC);    Deflection measurement;    Digital image correlations;    Displacement distribution;    Experimental research;    Falling weight deflectometer (FWD);    Measurement techniques;    Road pavement structure;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/356/1/012024/pdf
DOI  :  10.1088/1757-899X/356/1/012024

学科分类：土木及结构工程学

来源: IOP

【 摘 要 】

In diagnostics of existing road pavement structures deflection measurements have fundamental meaning, because of ability to assess present stiffness (bearing capacity) of whole layered construction. During test loading the reaction of pavement structure to applied load is measured in central point or in a few points located along a straight on a 1.5 ÷ 1.8 m distance (i.e. Falling Weight Deflectometer) in similar spacing equal to 20 ÷ 30 cm. Typical measuring techniques are productive and precise enough for most common pavement structures such as flexible, semi-rigid and rigid. It should be noted that in experimental research as well as in pavements in complex stress state, measurement techniques allowing observation of pavement deformation in 3D would have been very helpful. A great example of that type of pavements is a block element pavement structure consisting of i.e. paving blocks or stone slabs. Due to high stiffness and confined ability of cooperation of surrounding block elements, in that type of pavements fatigue life is strongly connected with displacement distribution. Unfortunately, typical deflection measurement methods forefend displacement observations and rotation of single block elements like paving blocks or slabs. Another difficult problem is to carry out unmistakable analysis of cooperation between neighboring elements. For more precise observations of displacements state of block element pavements under a wheel load a Digital Image Correlation (DIC) was used. Application of this method for assessment of behavior of stone slabs pavement under a traffic load enabled the monitoring of deformations distribution and encouraged to formulate conclusions about the initiation mechanism and development of damages in this type of pavement structures. Results shown in this article were obtained in field tests executed on an exploited pavement structure with a surface course made of granite slabs with dimensions 0.5x1.0x0.14 m.