In this paper, two advanced ground improvement schemes have been introduced to improve soft and erodible soil properties. The improvement of an unstable formation soil with pH neutral chemical admixture and the sub-surface drainage is described. Internal erosional behaviour of lignosulfonate treated erodible soils has been studied using the Process Simulation Apparatus for Internal Crack Erosion (PSAICE) designed and built at UoW. Effectiveness of lignosulfonate treated erodible soils on the erosion resistance has been investigated and its advantage over conventional methods are presented and discussed. For soft soil formation stabilised by sub-surface drainage, the paper will look at the inevitable problems of smear associated with mandrel driven Prefabricated Vertical Drains (PVDs), the distribution of suction pressures through PVD, and the conceptual development of consolidation models capturing the effects of vacuum. The applications to case histories employing equivalent plane strain theory developed by Indraratna and co-workers will be presented and discussed.