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An improved method, i.e.,  f locculation– s olidification  c ombined  m ethod ( FSCM ), has been developed for building a working platform more efficiently at the surface of newly reclaimed ground filled with hydraulically dredged  m ud  s lurry at  e xtra  h igh  w ater content ( EHW-MS ). Previous experimental results have demonstrated the significant superiority of  FSCM  over conventional pure cement solidification method ( PCSM ) under some application conditions. This study focuses on further clarifying the reasonable boundary for the application conditions, i.e., identifying the reasonable application range, of  FSCM  in  EHW-MS  treatment. A number of laboratory experiments are performed to characterize the deposition and strength gain behavior of  FSCM  or  PCSM  treated  EHW-MS  samples with various values of the equivalent initial water content ( wei ) and Atterberg limits. The deposition and strength characteristics resulting from  FSCM  and  PCSM  are then compared comprehensively to illustrate the influence of  wei  and Atterberg limits on the superiority of  FSCM  over  PCSM . Results indicate well that  FSCM  shows more significant superiority over  PCSM  with the increase of either  wei  or Atterberg limits, and plastic limit &gt; 14 (or liquid limit &gt; 23) and  wei  &gt; 232% can be considered as the reasonable application range of  FSCM  in  EHW-MS  treatment, within which the solidification efficiency of  FSCM  is at least 1.20 times higher than that of  PCSM .

Reasonable application range of flocculation–solidification combined method in treatment of hydraulically dredged mud slurry