Abstract：Research purposes: The discrete element simulation model of ballast bed on bridge is established and calibrated through full-scale ballast bed resistance test. We analyze the influences of section parameters such as width and thickness of ballast bed on ballast bed resistance, also discuss the influence range of transverse resistance and the sharing characteristics of each part of ballast bed on resistance. In order to reduce the second phase dead load and create conditions for bridge design, we put forward the optimization suggestions of ballast bed size on long-span bridge. Research conclusions:(1) Within a certain range of width of the bed, the resistance increases with the top width increasing. When the top width increases from 3 400 mm to 3 800 mm, the increase rate of lateral resistance decreases from 16.9% to 4.6%, and the longitudinal resistance is less affected by the top width. (2) Within a certain range of thickness of the bed, the resistance increases with thickness increasing. When the thickness increases from 250 mm to 450 mm, the increase rate of lateral resistance decreases from 31.4% to 5.9%, and the increase rate of longitudinal resistance decreases from 18.6% to 4.0%. (3) The ballast within the width of 400 mm from the sleeper end is the main area to provide lateral resistance. (4) The resistance of ballast bed is mainly composed of the resistance of sleeper bottom, sleeper side and sleeper end, in which the lateral resistance of sleeper bottom is about 62%, sleeper side is about 14%, and sleeper end is about 24%. (5) Considering the resistance, economy and operation and maintenance requirements of ballast bed, it is suggested that the top width and thickness of ballast bed on bridge should be 3 400 mm and 300 mm respectively. (6) The research conclusions can provide a theoretical reference for the size optimization of ballast bed section on long-span bridges.
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2022, Vol. 39 
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