Abstract:With the continuous development and expansion of city, the municipal road network gradually expands from the urban area to the suburbs. The overall concept of building community first and then building road leads to the emergence of various miscellaneous fill foundations in the municipal roads. In order to ensure the stability of the roadbed, the miscellaneous fill foundation needs to be treated. Through a detailed comparison of the four practical methods of subgrade treatment, such as the dynamic compaction method, the soil replacement cushion method, the column hammer punching and expanding pile method, and the cement fly ash gravel pile method, the method of combining the soil replacement cushion and the column hammer punching and expanding pile is finally determined to treat the roadbed by sections. The bearing capacity and settlement of the subgrade after the roadbed treatment are checked and calculated. The construction precautions related to the roadbed treatment scheme are put forward, which not only solves the problems in the treatment of miscellaneous fill roadbed in the actual project, but also provides the reference and ideas for the similar projects.
