Uplift pressure is a major load effecting overturning safety in design of concrete gravity dams. This paper discusses the right way of treating of uplift pressure in structural design of concrete gravity dams for overturning problem from the view point of deliberate theory and numerical analyses by FEM.

Rock quality classification at the concrete aggregate production work in dam construction is based on the results of visual observation on blasted rocks distributed near the ground surface. Since it is impossible to inspect inside the ground, the accuracy in estimating the rock quality for the solid portion of the rock mass is therefore also limited. Furthermore, works related to drilling for blasting such as determination of the drilling positions and lengths are normally carried out manually. Under these conditions, a labor-saving means by mechanization has been desired. To resolve the problem, we developed a rock blasting management system named “T-iBlast DAM”, which consists of rational construction techniques with an information and communication technology (ICT). This system consists of two subsystems, which are named “the intelligent crawler drill system (ICDS)” and “the ground evaluation system (GES)”. ICDS has a logging-while-drilling and the drilling guidance functions. In this report, we will de-scribe the summary of the system and the results of a verification experiment on the drilling survey and of a demonstration experiment at an aggregate production site.