Landfilling is one of the most economic and feasible means of disposing municipal solid waste in Sri Lanka as well as the other Southeast Asian countries. In the past, the disposal of waste fills were carried out by uncontrolled dumping into low-lying areas close to housing estates in urban areas. With increasing scarcity of land in urban areas, it is increasingly difficult to find new abandon lands for constructions and sites for future dumping. When authorities started constructions on these abandon waste dump sites it created huge problem regarding strength and compaction of underling soil layers. This has prompted the local authorities and privatized companies to find solutions to improve the soil in abandon dump sites before starting any constructions.2 LITERATURE REVIEWA comprehensive Literature Review has been carried out in order to get the existing knowledge updated on the past incidents along with the latest events related to dynamic compaction and Municipal solid waste in abandon dump sites in past years.2.
1 Ground improvementGround improvement methods are ever more accepted by the geotechnical design community. Contractors have pushed to offer more cost effective means and methods to save time and money. Over time, many of these systems have continued to mature, with project experiences in many systems exceeding large number of projects. From this work, a vast amount of experience has developed; both in application as well as performance, but much of the performance data remains unpublished or undocumented. To this degree it becomes personal experience, and therefore, the growth of the ground improvement market has been slow, but progressive.The degree of effectiveness of the technique is depending on right system and the right condition.
For further clarification, the technique should be choose on the right system for the right soil conditions, by understanding the limitations of the system as well as the response to the ground conditions to the installation.Once the subsurface conditions are understood, one must understand the available ground improvement systems and recognize the degree of difficulty to change the ground. For instance, if strengthening is desired, and is to be achieved by densification, one must understand how easy or difficult it is to rearrange the soil particles to a denser packing. For dynamic compaction, high groundwater may inhibit the effect by damping energy transmission. But for vibro compaction, where water is typically injected during penetration of the probe, a liquefaction condition is desirable to more easily rearrange the particles to a tighter packing.(Burke & Shen, 2003)