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Date of Publication:2022-10-09
Journal:计算力学学报
Volume:29
Issue:3
Page Number:439-445
ISSN No.:1007-4708
Abstract:Investigation on elastic modulus of railway ballasts in wind with
different sand contents can be benefited to understand the dynamic
characteristics of railway track in wind-blown sand areas.In this
study,discrete element models are developed,and elastic modulus is
calculated of ballasts in wind with different sand contents gamma.The
results show that elastic modulus remains a constant with low sand
contents(gamma<30%),and decreases linearly with increasing sand contents
with high sand contents(gamma >30%).The simulation results agree with
the experimental results.The internal mechanism of the relationship
between elastic modulus and different sand contents is analyzed in terms
of the strength and the spacial distribution of the force chains,and the
coordination number of ballast-sand mixtures.The present study can be
helpful for the understanding of the dynamic properties of ballasted
railway tracks in wind-blown sand areas,and for the structure design and
sand disaster treatments of ballasted beds.
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