A. A. Eremenko

Hands-on experience of safe and efficient ore mining in Siberia

The authors report findings on geomechanical assessment of rock masses. The flow charts and parameters of geotechnology for ore extraction by blocks and sections under conditions of rockburst hazard are presented. It is stated that the use of the new mining and blasting technologies results in appreciable economic effect.

Geomechanical validation of the parameters and technique for damping layer in the vicinity of underground excavation for overburden pressure relief

The data on stress-strain state around an underground excavation in an unstable rock mass are reported. For overburden pressure relief, it is proved necessary to create a damping layer, and the related drilling-and-blasting parameters are determined. Zones of probable fracture of rock mass under camouflet blasting are identified.

Influence Exerted by Construction of Vertical Cylindrical Explosive Charges Increased in Diameter on the Degree of Ore Shattering

The results are presented for the laboratory and in-situ investigations into influence exerted by construction of the vertical cylindrical explosive charges on the degree of rock-mass shattering. The necessity is shown for creating the ascending workings with a cross-section up to 1m2. For the vertical concentrated charges with inert gaps, the drilling-and-blasting parameters ensuring a decrease in specific consumption of explosive for the secondary shattering are given.

Specific Features of Iron Ore Mining in Gornaya Shoria

The complex geological conditions and geomechanical behavior of rock mass at the Tashtagol, Sheregesh and Kaz deposits induce geodynamic events during transition to deeper level mining. Mining advance from the higher stress concentration areas in the hanging wall of a fault towards the lower stress concentration areas contributes to the reduction in rockburst hazard. The use of the self-propelling equipment provides larger volume of preparatory driving per 1000 t of ore production by 10–20% as compared with the portable equipment. The mechanism of rock mass movements in deeper level stoping is revealed. Increased mining depth and high strength of enclosing rocks are favorable for starting extraction of ore reserves left in pillars. The combination of these factors and the efficient mining system design enable mining of blind ore bodies without backfill and allows extraction of ore reserves from pillars under the rivers and ground surface infrastructure.

Geodynamic and Seismic Events under Rockburst-Hazardous Block Caving in Gornaya Shoria

The authors give an assessment of the effect exerted by blasting on the intensity of geodynamic and seismic events. The key regularities of distribution of shocks under blasting of rock blocks are found. The scope of the experimental research embraces determination of seismic velocities on the ground surface in mining area in Gornaya Shoria.

Influence of Ore Discharge Intensity on the Dynamic Rock Pressure Manifestations

The results are presented for the experimental investigations into the influence of ore discharge on the rock mass state and dynamic phenomenon manifestations. The features of energy, space, and time distribution of shocks, as well as their intensity are studied in various sequence and volume of rock mass discharge.

Control of Shattering Effect of Explosion in Mass Ore Caving

The results of experimental investigations into mutual location of bundle contiguous charges and vertical concentrated charges in the nonuniformly stressed rock masses are presented. The schemes are considered for ore blasting in blocks into the caved rock and compensation chambers. The parameters are given for drilling and blasting operations.