In this study, asymmetrical and symmetrical pile length model tests were performed to investigate the interaction between retaining piles with asymmetrical excavation. The deformation, earth pressure, and bending moment of the retaining pile on both sides were measured during asymmetrical excavation. The numerical analysis using PLAXIS 2D was validated by comparing the results with experimental data. Through numerical studies, the horizontal displacement, bending moment, and earth pressure of the piles were studied with asymmetrical excavation in terms of three design factors: asymmetrical pile length, pile stiffness, and bracing stiffness. Results show that asymmetrical excavation induces a “push-back effect”, and the pile-top displacement on the shallower side decreases from 0.54 mm to 0.49 mm and from 0.47 mm to 0.42 mm for asymmetrical and symmetrical pile lengths, respectively. The deformation, earth pressure, and bending moment of the retaining pile develop asymmetrically during asymmetrical excavation. The lateral earth pressure distribution was closely related to pile deformation, while the pile bending moment was related to the lateral earth pressure and the axial force of the bracing. With a decrease in the retaining pile stiffness and an increase in the bracing stiffness, the deformation mode of the retaining pile transitioned from a cantilever type to a bulging type, which further influences the distribution of earth pressure on the retaining pile and the distribution of the pile bending moment. For asymmetrical excavation, a deformation-based asymmetrical design for the retaining pile length is recommended to make good use of the push-back effect.

在本研究中，进行了非对称和对称桩长模型试验，以研究挡土桩与非对称开挖之间的相互作用。测量非对称开挖过程中两侧挡土桩的变形、土压力和弯矩。通过将结果与实验数据进行比较，验证了使用 PLAXIS 2D 的数值分析。通过数值研究，根据非对称桩长、桩刚度和支撑刚度三个设计因素，研究了非对称开挖桩的水平位移、弯矩和土压力。结果表明，不对称开挖会产生“推回效应”，对于不对称和对称桩长，浅侧桩顶位移分别从 0.54 mm 减小到 0.49 mm，从 0.47 mm 减小到 0.42 mm。非对称开挖过程中，挡土桩的变形、土压力和弯矩不对称地发展。侧向土压力分布与桩变形密切相关，而桩弯矩则与侧向土压力和支撑轴力有关。随着挡土桩刚度的降低和支撑刚度的增加，挡土桩的变形方式由悬臂型转变为胀形型，进一步影响挡土桩上土压力的分布和土压力的分布。桩弯矩。对于非对称开挖，建议采用基于变形的非对称挡土桩长度设计，以充分利用反推效应。