Verification of soil compaction degree based on the correlation of static probing during formation of DSM columns

The state-of-the-art methods for verifying the correctness of ground improvement performed by means of the DSM (Deep Soil Mixing) technology are largely focused on the selection of adequate factors impacting the achievement of a correct compressive strength R_c [MPa] of the column core, which ensures the transfer of stress from the designed structures to the subsoil. In view of the operation of each of the columns, it is equally significant to ensure that their bases are located in load-bearing soil at the entire area of the improvement, without the need to perform many costly subsoil surveys. Based on the complementary soil investigation results and parameters obtained during deep soil mixing from an automatic logger installed on the drilling machine, a method of comparing the PKDK [bar] working pressure and the resistanc evalues under the base of the q_c [MPa] cone of the CPTU static probe was developed along with the method to interpret the results in the context of the correctness of the ground improvement.