Abstract
Hyper density method is one of the methods for permanent development of soil without adding foreign matter to soil which means leaving heavy gavels on the height. The term hyper density is derived from dynamic density of coarsegrained soils and dynamic strength of fine-grained soils and because these two methods are generally equal, the term hyper density has replaced it. High dynamic density, low energy density and dynamic replacement and mixture (DRM) are among the hyper density methods. Factors effective on design of this method depend on two important factors which include: soil factors, work equipment factors.
Highlights
Improvement of weak grounds is one of the geotechnical subjects which have attracted attention of many researchers
Fine-grained saturated soils are considered as incompressible when subjected to rapid loadings
Excess depth of soil improvement during subsequent impacts is due to the facts that contact time is shortened and less energy is adsorbed at top layers, the influence of the number of drops reduces as depth of influence increases
Summary
Improvement of weak grounds is one of the geotechnical subjects which have attracted attention of many researchers. The purpose of soil improvement is increasing soil load bearing capacity, decreasing ground settlement, decreasing soil porosity and increasing soil density, making uniform the deformability properties of materials and mitigation of inappropriate physical and chemical changes in soil. Compaction by this method involves dropping a heavy pounder with weight of 5-20 tons from free height of up to 30 m. In this technique, loose granular soil layers are densified by high energy impacts which result in reduction of porosity, compaction of soil and ejection of liquids in cavities (if any)
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