Abstract: Pile-platform-wall is a new kind of composite retaining structure, which has been used in actual engineering works, but its design calculation method is still immature. In traditional calculation, the pile foundation and platform connection were regarded as the hinge and the subgrade reaction was usually ignored in the calculation of bending moment, which was quite different from the actual situation. Based on the above situation, aiming at the single row pile-platform-wall structure, a new design calculation method was proposed, in which the subgrade reaction and the interaction between the pile and platform were considered. The reliability of the proposed method was verified by comprising its calculation results with those obtained from the finite element method in an actual engineering case. The results indicate that in the calculation process of bending moment of platform, bendingmoment and shearing force of pile foundation, both of the subgrade reaction and pile-platform interaction should be considered.

Key words: geotechnical engineering, composite retaining structure, design calculation, subgrade reaction, pile-platform interaction

摘要： 桩基-承台-档墙是一种新型组合支挡结构，已在实际工程中有所应用，但其设计计算方法仍很不成熟。传统计算中将桩基、承台连接视为铰接，承台弯矩计算中忽略地基反力，此与实 际情况有较大差异。基于此，针对单排桩基-承台-挡墙组支挡结构，提出了同时考虑地基抗力和桩-承台协调作用的设计方法，并通过工程实例与有限元计算结果对比分析，验证了理论方法的 可靠性。结果表明：在计算承台弯矩、桩基弯矩和剪力时，均应同时考虑地基抗力和桩基-承台协调作用。

关键词: 岩土工程, 组合支挡结构, 设计计算, 地基抗力, 桩-承台协调作用