01553868

Component

https://doi.org/10.3141/2448-14

This study is a preliminary analysis of the causes of upwarping of reinforced concrete slabs of a twin-block slab track, specifically on the subgrade-bridge transition section. The analysis considers the structural features and force characteristics of slab track on the basis of site investigations and numerical simulation, and a corresponding repair method is proposed. It is determined that the temperature and temperature gradient of the slab, the connection status between the slab and the hydraulically bonded layer (HBL), and the position of the terminal spine are the main factors that lead to the upwarping of the slab. Model tests on the force transmission parameters between slab and HBL are carried out to measure the adhesive strength of the cohesive contact and the friction coefficient for the frictional contact. The adhesive strength is found to range from 0.803 to 1.57 MPa. The actual friction coefficient with large dispersion varies significantly from 1.5 to 3.0 because of the influence of the strength of the material and the friction roughness. The analysis output shows that the upwarping of the slab decreases with the reduction of temperature and temperature gradient of the slab, but the upwarping increases with the decrease in adhesive strength and friction coefficient. Increasing the number of terminal spines with 4-m spacing, which is optimized after the spacing effect, contributes to the reduction of the slab upwarping. A reasonable layout scheme for anchor pins can significantly improve the integrity and stability of track structure affected by slab upwarping. From the output of the analysis, a repair method that involves setting additional anchor pins between the slab and HBL is thus recommended.

01553723

14-2107

English

pp 115-124

2014

Transportation Research Record: Journal of the Transportation Research Board

9780309295376

Print

Figures; References; Tables

Parametric analysis; Railroad bridges; Railroad tracks; Repairing; Slabs; Subgrade materials; Warpage

Design; Maintenance and Preservation; Railroads; I22: Design of Pavements, Railways and Guideways; I60: Maintenance

TRIS, TRB, ATRI

Feb 24 2015 10:11AM

• Assessment of Capacity Charges for Shared-Use Rail Lines
• Assignment of Freight Shipment Demand in Congested Rail Networks
• Bicycle Network Connectivity for Passenger Rail Stations
• Characterizing Ballast Degradation Through Los Angeles Abrasion Test and Image Analysis
• Comparison of Capacity Expansion Strategies for Single-Track Railway Lines with Sparse Sidings
• Deadlock Avoidance and Detection in Railway Simulation Systems
• Detection of Range-Based Rail Gage and Missing Rail Fasteners: Use of High-Resolution Two- and Three-Dimensional Images
• Fully Coupled Three-Dimensional Train-Track-Soil Model for High-Speed Rail
• Influence of Size and Shape Properties of Railroad Ballast on Aggregate Packing: Statistical Analysis
• Load Characterization Techniques and Overview of Loading Environment in North America
• Optimization of Siding Location for Single-Track Lines
• Optimizing High-Speed Rail and Air Transport Intermodal Passenger Network Design
• Railroad Track Transitions with Multidepth Deflectometers and Strain Gauges
• Railway Infrastructure Pricing in Europe for High-Speed and Intercity Services: State of the Practice and Recent Evolution
• Railway Train Wheel Maintenance Model and Its Application
• Track Ballast Fouling and Permeability Characterization by Using Resistivity