山区斜坡地形条件下桥梁嵌入式基础稳定性分析及设计方法OA

With the continuous advancement of infrastructure construction in western China,research on the bearing mechanisms and design methods of bridge foundations in complex terrain has become increasingly important.Focusing on the mechanical properties and structural design of embedded foundations for railway bridges in mountainous areas,this study investigates the potential failure modes of slope rock mass under combined loads.A theoretical calculation model for the embedded foundation-rock mass system under slope terrain conditions was established,revealing the interaction mechanism between the foundation and the slope rock mass.Based on this,combined with limit equilibrium theory,formulas for the ultimate bearing capacity of vertical embedded foundations and inclined arch-abutment embedded foundations under slope conditions were derived.The design rationality of the embedded foundation for the Zhongjian River Bridge was verified.The results show that the primary failure mode of vertical embedded foundations is overall shear failure of the rock mass at the pile end.As the shear force and bending moment loads outside the slope increase,the foundation-rock mass system is prone to horizontal shear failure.For inclined arch-abutment embedded foundations,the main failure mode involves combined failure at the pile end and along the pile side.The upper part of the pile foundation exhibits significant load-induced deformation,showing flexible characteristics,while the lower part mainly undergoes rigid deformation.Verification results indicate that the design parameters of both types of foundations meet bearing capacity requirements.The results provide a theoretical basis and engineering reference for the design and stability analysis of bridge foundations in mountainous areas.