Liong, Gouw Tjie creator Bergado, Dennes T. Chairperson Balasubramaniam, A.S. Examination Committee Noppadol Phien-Wej Examination Committee Surachat Sambhandharaksa Examination Committee The government of Netherlands Scholarship Donor text th Bangkok Asian Institute of Technology 1989 monographic eng 189 p. In this thesis the principle, working procedure and application of deep compaction techniques, namely: dynamic compaction, compaction piling and vibroflotation, for ground improvement and for reducing liquefaction potential in Sumatra, Indonesia, are reviewed. Five case studies, namely: three on dynamic compaction , one on vibroflotation, a nd one on compaction piling are presented. Comparison of t h e above techniques are also done when two different techniques are implemented in the same site. The above deep compaction methods are very good for reducing the liquefaction potential as well as t h e related effects of reducing the compressibility a nd increasing the s h ear strength properties of the subsoil. However, the effectiveness of each method depends on the subsoil properties. For sand with fines content less than 15%, vibroflotati on and dynamic compaction effectively improved the sub soils and reduced t h e liquefaction potential. vibro flotation yielded more uniform compaction. For sand with fines in the order of 10 to 40 % wit h coral fragments (coralline soil), dynamic compaction with 295 tm/m2 energy can only form about 5 m thick non -liquefiable surface layer. Deeper, more uniformly compacted non-liquefiable subsoil is best obtained by compaction piling. The depth of influence of dynamic compaction is also affected by the energy per drop , the cumulative compaction energy , and the base area of the tamper as well. The enforced settlement induced by dynamic compaction was found to be a linear f unction of cumulative compaction energy , at least up to energy levels of 20 0 tm/m2 for sand with less than 15 % fines and 420 t m/m2 for coralline soil . Statistical analysis show that the degree of improvement achieved by each compaction method s can be approached by exponential functions of the pre-compaction sand density. Beside the soil properties, the comp action procedure a l so affect the degree of compaction. In compaction piling , the two phase working method yields more uniform and better compaction than one phase method . Even though several formula can be used to design deep compaction work, test trials are important to determine the best compaction pattern , passes, spacing of print and cumulative compaction energy . A thesis submitted in partial fulfilment of the requirements for the degree of Master of Engineering, School of Engineering and Technology Thesis (M.Eng.) - Asian Institute of Technology, 1989 Soil stabilization Indonesia Sumatra Asian Institute of Technology. http://203.159.5.9/ait-thesis/detail.php?q=B18039 http://203.159.5.9/ait-thesis/detail.php?q=B18039 301198 20260818085913.0