【摘要】 临近河流条件下，深基坑支护体系受河流边界条件等因素的影响，其破坏模式与稳定性分析更加复杂。文中通过建立临河深基坑极限有限元数值分析模型，用参数化研究揭示深基坑临河侧边界条件、水位与背河侧荷载等条件下的基坑破坏模式与稳定性变化规律。研究结果表明，随着基坑深度、水位、河流坡度及临近超载的增加，临河深基坑的安全系数逐渐减小，稳定性安全系数不断降低。当临河距离超过开挖深度的1.2～1.5倍时，破坏模式由非对称破坏转为对称破坏，背河侧施加超载会加剧非对称破坏模式的程度。工程中应注意相关因素的影响，采取适当的措施，控制基坑变形并提高基坑整体稳定性。更多还原

【Abstract】 Under conditions adjacent to a river, the retaining system of deep foundation pits is influenced by river boundary effects, making the failure modes and stability analysis more complex. In this study, a limit finite element numerical model for a riverside deep foundation pit is established. A parametric analysis is conducted to investigate the failure modes and stability variations of the foundation pit under different riverside boundary conditions, water levels, and surcharge loads on the landward side. The results indicate that the factor of safety of the riverside deep foundation pit decreases progressively with increasing excavation depth, water level, river slope, and adjacent surcharge. When the distance between the foundation pit and the river exceeds approximately 1.2～1.5 times the excavation depth, the failure mode transitions from asymmetric to symmetric. The application of surcharge on the landward side further intensifies the degree of asymmetric failure. In engineering practice, the influence of these factors should be carefully considered, and appropriate measures should be adopted to control deformation and enhance the overall stability of the foundation pit.更多还原