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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摘要为提升我国高速铁路刚性面板加筋土挡墙抗震设计水平，结合前期振动台试验与数值模拟的研究成果，揭示刚性面板加筋土挡墙在地震作用下的变形演化机制，建立震后面板水平位移、表层沉降计算方法。研究结果表明：（1）加筋土挡墙变形演化历程可划分为3个阶段，随着地震强度增大，结构损伤逐渐向土体内部发展，表层沉降近似由三角形分布逐步转变为双峰形分布，最大峰值沉降位置逐步由面板附近转移至格栅末端附近。（2）地震作用下结构变形至破坏全过程可采用双楔形理论计算，锚固楔形法仅适用于结构上部筋材抗拔未失效的情况；（3）基于弹性地基梁理论和双楔形理论，建立了地震作用下考虑筋材失效机制的面板水平位移计算方法；（4）结合表层沉降的空间分布特点，将其简化为三角形分布和双三角形叠加分布，提出了地震作用下表层沉降计算方法；（5）面板底部边界条件对面板受力和变形影响显著，与底部固定铰支相比，固定刚接时面板水平位移减小，但面板截面所受的最大弯矩和剪力显著增大。研究成果可为高速铁路加筋土挡墙设计提供参考，同时也有助于推动该结构从容许应力法向性能设计法的转变。

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关键词 ：路基工程, 加筋土挡墙, 水平位移, 表层沉降, 双楔形理论, 刚性面板, 地震作用

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.

Key words： subgrade engineering')" href="#">

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

引用本文:

潘申鑫1，2，蒋关鲁1，2，刘先峰1，2，黄鑫1，2，袁胜洋1，2，曹丽君1，2，何梓雷1，2，周诗广3. 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[J]. 岩石力学与工程学报, 2025, 44(9): 2345-2359.
PAN Shenxin1, 2, JIANG Guanlu1, 2, LIU Xianfeng1, 2, HUANG Xin1, 2, YUAN Shengyang1, 2,. Deformation calculation methods of rigid facing reinforced soil retaining walls for high-speed railway under seismic action. , 2025, 44(9): 2345-2359.

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https://rockmech.whrsm.ac.cn/CN/10.3724/1000-6915.jrme.2025.0238 或 https://rockmech.whrsm.ac.cn/CN/Y2025/V44/I9/2345

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