The invention relates to a large-ramp
ballast track bed stability evaluation method, aiming at objectively analyzing the stability problem of the large-ramp
ballast track bed under extreme conditionsunder the combined action of
train load,
temperature load and gravity, more conforming to the actual
engineering condition, and providing technical reference and theoretical support for paving a
ballast track in a large-ramp mountain area section. The method comprises the following steps: (1) establishing a large-ramp ballast track
nonlinear finite element model, and modeling by adopting a parameterized
design language (APDL) of
finite element software ANSYS, including a steel rail, a sleeper and a ballast
bed structure; (2) analyzing the stability of the ballast
track bed of the large-ramp railway, applying a
train load, a gravity load and a
temperature load to the established
nonlinear finite element model of the large-ramp ballast track, and solving according to the slope and vertical curve
radius working conditions which need to be set; if the finite element calculation is not convergent, indicating that the ballast
bed is damaged, and entering an unstable state; otherwise, indicating that the ballast
bed is stable, and extracting equivalent plastic strain of the ballast bed to determine a dangerous area and a potential sliding surface of the ballast bed.