Effect of Anti-overturning Stability of High-speed Railway Gravity Shoulder Retaining Wall on Dynamic Deformation of Subgrade Surface
The support capacity of shoulder retaining walls has an important impact on restricting the dynamic deforma-tion of subgrade surface.A finite-difference spatial structure model was established to simulate the performance of ballast-less track subgrade instrumented with the shoulder retaining wall for high-speed railway.An orthogonal test scheme was used to study the effect of six factors,including embankment height,wall chest slope,wall back slope,wall-soil fric-tion,wall position,and anti-overturning stability coefficient,on the dynamic deformation of the subgrade under train load for gravity retaining wall mounted on the rocky foundation,with overturning damage as the predominant mode.Then the relationship between the dynamic deformation of the subgrade surface and those significant factors was established by introducing the dynamic deformation index Rω,which reflects the ability of the shoulder retaining wall to restrain the subgrade.The results show that,under train loads,the subgrade surface is deformed mainly in a compressive manner,with the following deformation approximately linearly positively correlated with the horizontal dynamic displacement of the top of the wall.The anti-overturning stability coefficient K0 and the wall back slope tanα of the retaining wall are the two significant factors affecting the dynamic deformation of the subgrade surface,and a binary cubic surface can be obtained between Rω and K0,tanα.Rω=8/ω ≥1.0 is adopted as a control function,which means the dynamic deformation of the subgrade surface with the shoulder retaining wall ω should not be greater than the corresponding value of the standard section embankment δ,to evaluate the effect of the wall back types on the limit value of the anti-overturning stability co-efficient[K0]of shoulder retaining walls.It can be seen that[K0]increases parabolically while the wall back gradually alters from outward-leaning to inward-leaning.The results are valuable for optimizing the design of shoulder retaining walls of high-speed railways.
shoulder retaining wallanti-overturning stabilitydynamic deformation of subgrade surfacefinite difference methodorthogonal test
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维普
