Abstract
The burden of the thermal power generation for national power supply has been increasing in Japan since the Great East Japan Earthquake that occurred in 2011. The coal is used as the main fuel for thermal power generation, and ash is discharged after utilizing coal for fuel. Because a lot of coal ash has been forced to landfill to waste disposal sites, bulk compression of coal ash is urgently required to keep sufficient space of the sites for waste dumping. This paper is to propose two methods for bulk compression of coal ash. One is a vibrating compaction method by inserting a rod into the ground while excess pore-water pressure is dissipated through a drainage layer. The other is a pressure injection method of fly ash after the fly-ash ground is unsaturated by use of dewatering method. The effects of the proposed methods have been confirmed by laboratory experiments and numerical analysis.
