Identification of Pavement Model Parameters in the Area of Discontinuous Surface Deformation Based on FWD Tests
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RESEARCH PAPER
Identification of Pavement Model Parameters in the Area of Discontinuous Surface Deformation Based on FWD Tests Marcin Grygierek1
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Krzysztof J. Sternik1
Received: 5 July 2019 / Revised: 1 August 2020 / Accepted: 26 August 2020 The Author(s) 2020
Abstract Determination of the parameters of the pavement model in the linear discontinuous surface deformation (LDSD) area is presented in the article. The values are based on back calculations which involve results obtained from the elastic halfspace model and the elastic—perfectly plastic model implemented in the finite element code compared with the results of the pavement deflection measured with Falling Weight Deflectometer (FWD). Based on the results of the calculations which have been matched to the results of the in situ measurements, the obtained values of the parameters of the pavement model within LDSD zone and outside it, were analysed. The results of pavement tests indicate at least a threefold increase in pavement deflections in the discontinuous deformation zone compared to deflections in the sections not affected by LDSD. The results of in situ tests and computational analysis presented in the paper allow their use in pavement reinforcement design in the area of anticipated LDSD. Keywords Pavement Mining area Falling weight deflectometer Back calculation FEM
1 Introduction Discontinuous deformations are a special type of mining deformations, which roads are very sensitive to [1–5]. Discontinuous deformations deteriorate evenness of the pavement posing a threat to the traffic and lead to loosening the layers of the pavement structure and the subsoil [6, 7]. Loosening of layers and subsoil leads to a reduction in their stiffness expressed by a modulus of elasticity, which results in a decrease in the fatigue life of the pavement, which determines the length of the period between repair works. The available literature often describes changes in the topography of the terrain (road lane) and related damage to the pavement in relation to the location of the operational plots [8–10].
& Marcin Grygierek [email protected] Krzysztof J. Sternik [email protected] 1
Department of Geotechnics and Roads, Faculty of Civil Engineering, Silesian University of Technology, ul. Akademicka 5, 44-100 Gliwice, Poland
However, experiments presenting an assessment of changes in pavement and ground stiffness based on field tests are rarely described [11]. Knowledge of the scale of changes occurring in the pavement and its subsoil due to the formation of discontinuous deformations caused by mining allows for more effective design of reinforcement where the possibility of discontinuous deformations is forecasted. The article presents the case of a motorway section in which linear discontinuous surface deformations (LDSD) remarkably deteriorating the geometrical and mechanical parameters of the surface were revealed. The geological and mining conditions of the motorway section in question wer
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