Analysis and discussion on post-construction settlement of soft soil foundation treatment test section of highway

Combined with the settlement observation data in soft soil foundation test section of highway projects, the final settlement of soft soil foundation by preloading was calculated by using three-point method, Asaoka method and hyperbola method, and the comparative analysis on the final settlement and post-construction settlement of soft soil foundation were conducted by various calculation methods, then the suitability of calculation methods for post-construction settlement of highway soft soil foundation was discussed. And the results are shown as follows: (1) The final settlement results calculated by three-point method and Asaoka method were less than hyperbolic method, due to only considering the primary consolidation settlement for the first two methods; the calculation results of three methods were close to each other when the secondary consolidation settlement was considered, and the secondary consolidation settlement should be considered when the post-construction settlement was calculated by the first two methods. (2) The post-construction settlement and differential settlement of soft soil foundation test section of highway calculated by three methods were all satisfied with the design requirements.