... groundwater levels. While groundwater inflow was not a major concern to the operation, the ambient hydrogeological conditions and depth of mining below groundwater combined to produce the presence of groundwater pressure in the rock mass. As a result, the new mine design involving buttress removal...

..., revised planning cross-section. The groundwater level is risen up to 20 m when the rainfall duration is long. In the initial plan, the safety factor for 2days is sufficient, but the safety factor for 4days is insufficient based on the rainfall duration. In the revised plan, however, the safety factor...

... ABSTRACT: Explosives detonated in a surface construction blast produce large quantities of gases that expand rapidly to fracture the rock. The gases contain toxic fumes such as carbon monoxide. If explosives are detonated in the rock below groundwater level, gas bubbles containing toxic fumes...