Field tests on pre-bored compaction lime-soil pile (down-hole dynamic compaction method) to improve serious collapsible loess

The compaction method used to control the subsoil of collapsible loess can eliminate collapsibility and improve bearing capacity of loess effectively. For serious collapsible loess in a power plant to be constructed, pre-bored compaction lime-soil piles (down-hole dynamic compaction method) field test studies were carried out. After the construction of the test piles were finished, a lot of in-situ tests including plate loading test, standard penetration test, etc., were used to evaluate the bearing capacity of the soil between piles, the piles and the composite foundation, and to test the deformation parameters. Especially, comparative research between natural status and soaked status of composite foundation as well as comprehensive evaluation of effects of ground treatment were carried out.