Abstract
The interfacial bond between cement concrete base plate (CCBP) and asphalt concrete waterproofing layer (ACWL) is a weak portion in the newly developed Chinese high-speed railway ballastless track. The interface damage caused due to fluctuating temperature load and dynamic train load is one of the most critical problems in Northern China. This paper aims to investigate the interface damage evolution process under temperature load via experimental and simulation analysis. Full-scale transverse shear tests were performed to explore the interface bond-slip mode of the adjacent ACWL and CCBP. Then, a finite element model of a ballastless track structure was built and a cohesive zone model (CZM) was utilized to model the interface damage initiation, crack propagation, and delamination process under uniform/gradient temperature load. Furthermore, the dynamic response of the ballastless track where CCBP and ACWL were partly/totally debonded was investigated and compared with the perfectly bonded structure. The results demonstrate that bilinear CZM is capable of revealing the interface damage initiation, crack propagation, and delamination process under temperature load. The interface state between the adjacent CCBP and ACWL was greatly affected by temperature changes and the interface bonding state had a great impact on the dynamic response of ballastless track.
Highlights
Asphalt concrete has been tentatively used for a full-cross-section waterproofing layer in the substructure of ballastless track in China [1,2]
As a layered structure composed of track-slab, cement concrete base plate (CCBP), asphalt concrete waterproofing layer (ACWL), and cement concrete base or supporting layer, the adjacent layers in the ballastless track subgrade are bonded by the interfacial adhesion force which is much smaller than the strength of the concrete layers [15,16]
The interface damage, crack, and delamination process under the combined action of temperature loads and train dynamic load was investigated and the results indicate that a cohesive zone model (CZM) is capable of predicting the interface damage propagation process
Summary
Asphalt concrete has been tentatively used for a full-cross-section waterproofing layer in the substructure of ballastless track in China [1,2]. As a layered structure composed of track-slab, cement concrete base plate (CCBP), asphalt concrete waterproofing layer (ACWL), and cement concrete base or supporting layer, the adjacent layers in the ballastless track subgrade are bonded by the interfacial adhesion force which is much smaller than the strength of the concrete layers [15,16]. The objective of the current work is to study the interface bond-slip process of the adjacent CCBP and ACWL in the ballastless track subgrade under temperature loads and dynamic train loads based on the crack parameters of CZM obtained from field transverse shear tests. A 3D finite model of a new ballastless track structure which utilizes the full-cross section ACWL was built in ABAQUS to model the interface damage initiation, crack propagation, and delamination process under uniform and gradient temperature loads. Were the dynamic ballastless track structure containing slight and severe interface damage were analyzed
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