高速铁路刚性面板加筋土挡墙地震作用下变形计算方法研究

doi:10.3724/1000-6915.jrme.2025.0238

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Abstract To enhance the seismic design standards of rigid-facing reinforced soil retaining walls for high-speed railway in China, this study builds upon prior shaking table tests and numerical simulations to elucidate the deformation evolution mechanisms of such walls under seismic action and establishes calculation methods for post-earthquake horizontal displacement of the facing and surface settlement. The research findings indicate: (1) The deformation process comprises three distinct stages, with increasing seismic intensity causing structural damage to propagate inward. Surface settlement distribution transitions from triangular to bimodal, with peak settlement shifting from near the facing toward the reinforcement ends. (2) The entire deformation-to-failure process can be calculated using the double-wedge method, whereas the anchored wedge method is only applicable when the pullout resistance of upper reinforcements remains effective under seismic action. (3) Based on the elastic foundation beam theory and the double-wedge calculation method, a computational method for determining horizontal displacement of rigid facing in geosynthetic-reinforced soil retaining walls was developed, explicitly incorporating reinforcement failure mechanisms under seismic action. (4) Simplified into triangular and superimposed double-triangular distributions based on surface settlement's spatial characteristics, a calculation method for seismic-induced settlement was proposed. (5) Boundary conditions at facing bottoms significantly influence structural behavior: compared with fixed hinge connections, fixed rigid connections reduce horizontal displacement but increase maximum bending moment and shear force in facing sections. These insights provide valuable references for the design of high-speed railway reinforced soil retaining walls, while also facilitating the transition from the allowable stress design method to performance-based design methods for such structures.

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subgrade engineering reinforced soil retaining wall horizontal displacement surface settlement double-wedge theory rigid facing seismic action

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