... as primary support. This improves the efficiencies of the mining cycle which is a benefit to fully mechanised shallow bord and pillar operations in the Bushveld Igneous Complex. 1 INTRODUCTION An increase in shallow hard rock mines on the Eastern Bushveld Limb has increased the demand for active support...

..., the authors originally designed the vertical/horizontal boreholes to enclose the storage caverns and developed an independent water supply pipe sys-tem for the water curtain boreholes. Furthermore, the authors developed the efficiency test method to evaluate each water curtain borehole individually...

... new jobs initiating new jobs High efficiency Average efficiency Low cost of labor High cost of labor High investment cost Low investment cost Summary Cost-effective for tunnels of Average cost-effective for more than 3 km tunnels of up to 3 km or more Potential advances: Potential advances: automation...

... zone increases significantly efficiency of stimulation of a well. It is carried out by directed unloading of the reservoir on the basis of knowledge of the deformation, strength and filtration properties of specific field rocks. Examination of rock mechanical properties is made by laboratory tests...

... Abstract Dynamic tests using the Split Hopkinson Pressure Bar test (SHPB) were conducted on granite specimens in order to study the efficiency of the drill and blast method and the environmental impact of the excavation of a tunnel in urban areas. The tests were performed at different strain...

...-mechanism creates paradoxical effect providing the formation of new faults in intact rock mass at shear stress levels significantly below the frictional strength. This indicates that the lower limit of lithospheric strength is not restricted by the frictional strength. The varying efficiency...

..., the effects of the rock brittleness on the efficiency of diamond beads are examined by investigating cutting rate and unit wear values. Until now, the effect of the rock brittleness on diamond wire cutting has not been put forward by any researchers. Therefore, it is aimed to correlate the relationships...

... tunneling in hard rock were overcome. ground transportation hard rock Efficiency replacement structural geology cutter segment dislocation rail transportation long-distance shield water leakage cutting tool Reservoir Characterization key technology segment damage tunnel shield machine...

... parallel element-by-element scheme vector algorithm finite element analysis Engineering processor Parallel Computation matrix Artificial Intelligence Efficiency computing ebe method parallel computer node Computation computer domain decomposition mechanics Eurock 2005 -Impact...

... galleries set up to protect roads particularly exposed This paper intends to present how modelling can be used for the analysis of the functioning and the performances of both systems and in order to help engineering in the design of efficient devices. 1. NET FENCES- THE ASM NETS: A COMPLEX STRUCTURE...

... that it is this action which eventually causes the chipping and ultimate fracture of the rock. The existence of these crushed zones imposes constraints on efficiency and increases dust generation (Khair, 2001). This paper will primarily discuss the numerical study on the fragmentation mechanics of the cutting process...

... Artificial Intelligence strength rock fragmentation fuzzy logic rock destruction Efficiency Upstream Oil & Gas heterogeneity rock strength damage evolution fuzzy set constituent Drilling mechanics fuzzy damage parameter damage parameter membership function destruction...

... ABSTRACT: Verification of the efficiency of operational and technical measures in a problem field of rockbursts, hydrogeology, engineering geology, and supports in long mine workings and impacts on surface and underground structures is performed on equivalent models in the laboratory...