Movement of stabilized coal-ash soil wall during excavation

The amount of coal ash produced in Japan is expected reach to 7 million tons by the year 2000. It will be difficult to find the disposal location for this ash. Consequently, expanding the beneficial uses of the coal ash as a civil engineering material has become an Important issue. EPDC has been developing the deep mixing soil stabilization method with blended slurry containing fly-ash(F)(coal ash),gypsum(G) and cement(C ).(Hereafter FGC-DM).Self supported earth retaining wall from FGC-DM was built at the construction site of coal thermal power station. This earth retaining wall, which is one kind of the gravity retaining wall, is 12m high and contains a volume of improved soil of approx. 40,000m 3 . Measurements were made to study the stability of the wall. This paper presents the results of the stability and design method of an earth retaining wall..