Stress analysis ballastless design of the top structure of railway track and railway tunnel lining
Abstract
Stress analysis ballastless design of the top structure of railway track and railway tunnel lining
Incoming article date: 02.03.2015Currently, there is a constant increase in train speeds and loads on the structure of railway track. In tunnels these loads are also transferred to the lining, and the stress-strain state of tunnel structures in the application of ballastless track and large axial loads requires further study. To carry out such a study developed a numerical model of a railway tunnel with a circular cross-section ballastless design path, including under-rail support, resilient layer and track concrete. As a result of the calculation model, the values main vertical stresses in the main tunnel structures. Found that with increasing loading of the wheel on the rail from 100 to 200 kN stress increases by an average of 50%. The distribution of stress affects the stiffness of the elastic layer. With its increasing vertical stress in the under-rail support non-linear decrease, and at the road concrete increases nonlinearly.
Keywords: Ballastless railway track, tunnel lining, tension, ground concrete, axial load