Substantiating parameters of ­zeolite-smectite puff-stone washout and migration within an extraction chamber

Abstract

SToNe wAShouT AND miGrATioN wiThiN AN exTrAcTioN chAmber Purpose. To substantiate parameters of zeolitesmectite puffstone deposit hydromining method while analyzing dependences between physicotechnological indices of hydromining equipment and rock mass characteristics, which will help optimize the extraction technique. methodology. Complex research approach (i.e. field observations, laboratory tests, and bench testing) is the methodological basis to solve the problem. The approach involves system analysis, physical modeling of hydrodynamic processes, and outcome analysis using MаtLаb mathematical software package. findings. Dependences of zeolitesmectite puffstone failure upon a mouthpiece diameter, water pressure, washout radius, and gravity streaming hydraulic transportation within an extraction chamber have been determined. Effect of kinetic energy of a falling slurry stream on the decrease in the specific power consumption in the process of rock transportation over an extraction chamber floor has been identified. Power consumption dependence upon hydraulic monitor dimensions and working agent pressure is of quadratic nature: the increased pressure of a working agent in front of a mouthpiece, power consumption of the washout increases, and specific water consumption drops. originality. For the first time, an approach to describe zeolitesmectite puffstone failure taking into consideration hydrody namic puffstone washout, hydraulic mixture migration within an extraction chamber, and transportation of the mineral has been applied. Relying upon power consumption to washout hydraulic mixture and transport it within a washout chamber, both linear nature and directlyproportional dependence of transport capacity upon hydraulic monitor loss and chamber floor slope has been determined. Power consumption dependence has been defined for different types of mouthpieces and working agent pressure in order to avoid cuts and layerbylayer washout of a mineral. Practical value. The obtained results can be applied to improve dominating parameters influencing the hydrodynamic process for zeolitesmectite puffstone washout. For the purpose, rational efficiency of puffstone failure has been identified as well as ro tational angle of a lateral mouthpiece of a jet head at 15-20 m height in terms of layerbylayer washout with rock migration over a distance being equal to a half of the washout diameter. Real conditions (for zeolitesmectite puffstones) have been determined under which minor jet velocity variation from the determined parameters results in a cut or in a fall of the washout chamber.

Substantiation of Thermomechanical Technology Parameters of Absorbing Levels Isolation of the Boreholes

“…The technology of transportation of cylindrical briquettes of TCM along the borehole shaft and possibility of thermomechanical contact melting of TCM in the zone of flushing water removal are substantiated. The method of absorbing levels isolation with PET-based TCM application is defended by Ukrainian patents [1][2][3][4][5][6][7][8][9][10][11].…”

“…Topicality. Drilling of both exploration and exploitation boreholes for exploration of deposits and extraction of minerals in the area of iron-ore and coal basins is conducted in a high degree of development and metamorphism, in strong and fractured rocks [1][2][3][4][5][6][7][8][9][10]. Rocks of mined levels are in complicated stressed state [11][12][13][14][15][16][17][18] that during construction of mine workings only complexify the technology of their installation [19][20].…”

Development of resource-saving technology when mining ore bodies by blocks under rock pressure

“…Works [11][12][13][14][15] suggest various options of mining systems enabling increase of extraction of ore mass from stope blocks. However, blocks fail under the influence of rock pressure when forming the compensatory area, thus causing increased mining costs and time.…”

Substantiation of ways to reclaim the space of the previously mined-out quarries for the recreational purposes

“…The following requirements are specified to recreation zones with water objects [13]: compliance of water quality of a water object and the state of the territory with health requirements; existence or possibility of arranging the convenient and safe approaches to water; availability of access roads to the recreation zone; safe bottom relief; favorable hydraulic control; lack of possibility of adverse and dangerous processes [14][15][16][17]. In the improvement of the recreation zone of a quarry, it is necessary to observe the following requirements.…”