Abstract
Within a project of Technology Agency of the Czech Republic No. TA 04030889 “Operational diagnostic of qualitative indicators of railway tracks by means of gauging its spatial deformation.” Empirical cross-resistance tests of sleepers in railway ballast were carried out in geotechnical laboratory test field (GLTF) of the Transport research center in Brno (TRC). The tests were done in collaboration with Czech Technical University in Prague, Department of Railway Structures (ČVUT).
Highlights
Geotechnical laboratory test field in the picture 1 is a unique technical device registered by Office for Patents and Inventions as a Utility Model on which tests for laboratory structural body layers of rail bottoms and for rail superstructures regarding the current simulation effects of a different operating load and climatic conditions can be done
The structural organization of geotechnical laboratory test field (GLTF) is depicted in Figure 2. [1]
Track bed ballast is made of sandy clay, layer thickness 300 mm, capacity of the track bed ballast is calculated to
Summary
Geotechnical laboratory test field in the picture 1 is a unique technical device registered by Office for Patents and Inventions as a Utility Model on which tests for laboratory structural body layers of rail bottoms and for rail superstructures regarding the current simulation effects of a different operating load and climatic conditions can be done. Modeling procedure: Establishment of the ground plane, determination of the bearing capacity of the railway underbody body by static loading test, construction of the track bed plan below the sleeping area of the sleeping area and laying of the rail grid. E0= 20 MPa. Track bed of the body of the rail bottom, required load capacity Epl= 40 MPa (for main tracks of the current national and other railways; see Tab. 1 and 4, attachment 6, regulation S4). Module of deformation of the structural layer E1= 60 MPa. K2= h1/D = 0.40/0.30 = 1.33 Where they mark: E0r - reduced module of deformation of track bed ballast [MPa], E1 - module of deformation of the structural layer [MPa], h1 - thickness of the structural layer [m], D - diameter of the load plate [m]. 8, attachment 6, regulation S4 K3 - 0.71 The equivalent module of deformation of a two-layer construction of the rail bottom body. Under the classified sub-grade (F4 - CS) 350 mm of thickness, there is a 600-mm layer of loess soil (LS) of similar properties. [7]
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
