Abstract: Dynamic replacement method is one of the effective ways to treat the foundation. However, up to now there hasn't a set of ripe design method that can be used in the dynamic compaction design. Therefore, field test-determination has become the main means to select the process parameters for dynamic replacement. For this, dynamic compaction test is made in the main plant building in Sijiaying Iron Mine's concentrator. The curves of the relationship between the compaction number, densified area thickness and density are determined. Based on the test-obtained parameters, the dynamic compaction design and construction of the foundation are made.

Key words: Foundation, Dynamic compaction, Replacing parameters