This paper presents the research results of the pulp movement process along the extraction chamber bottom to the suction pipe of the pulp lifting device in case of downhole hydraulic mining the volcanic tuff-stone. The washout process and hydraulically operated transportation of the tuff-stone hydraulic mixture, when forming the extraction chamber, have been studied under various conditions and methods of exposure. As a result, the dominant parameters have been determined influencing the hydrodynamic washout technology as well as tuff-stone hydraulic mixture lifting to the alluviation map. The dependences have been substantiated of the washout process performance and transportation capacity of the hydraulic mixture flow on the determined parameters. To calculate the process of pulp flow-over along the extraction chamber bottom to the intaking hydraulic elevator headwall, the systems of equations have been determined based on the modelling the movement of tuff-stone hydraulic mixture along the extraction chamber bottom during hydraulic washout. The dependences of the contact strength of the tuff-stone samples mined by downhole method on the time spent in water are presented, resulting in determination of the tuff-stone weakening coefficient and the degree of its saturation with water.
Purpose. To experimentally determine the main design and operational parameters of the influence of rock mass properties on the Roller Crusher performance when processing basalt rock mass. Methodology. The crushing and grinding of basalts are studied by the methods of mathematical statistics in order to identify the results obtained and determine the dependences of technological parameters on the mechanical impact factors. Experimental studies are carried out on the example of basalts from the Rafalivskyi quarry in the Rivne region. Findings. It has been revealed that the elemental composition of rocks in the benches of basalt quarries has a different mineral composition. Experimental studies of the rock crushing results have determined the efficiency of using screening for crushing basalts. The experimental dependences of the roller crusher performance in crushing and grinding modes on the properties of the rock mass have been obtained. Originality. The value of crushed rock fractal joints has been found, when using cone and centrifugal crushers, which is characterized by the shape factor and fractal dimension D. For cone crusher Kf=2.15.0 and D=1.4. For centrifugal crusher Kf=1.51.8 and D=1.17. These parameters testify to the energy feasibility of using centrifugal crushers. The high value of the multiple correlation coefficients R2 and Fisher criterion F, whose value at a significance level of 0.05 is higher than the critical one, indicates a sufficient convergence between the experimental and theoretical results and the accuracy of the obtained analytical dependences. Practical value. The generalized models for determining the Roller Crusher performance, obtained for each rock type, based on significant factors, greatly facilitate the choice of parameters for crushing and grinding processes, and also allow choosing a rational mode of crusher operation.
The materials of theoretical and practical researches are aimed at improvement of mathematical models of individual technological operations of the technology of underground development of zeolite-smectite tuff deposits of the Rivne-Volyn region by the hydraulic well method, taking into account the dominant factors of the hydraulic mining process. The subject of the research is the parameters of hydrodynamic erosion of zeolitesmectite tuffs, the movement of the slurry in the conditions of the mining chamber and the transportation of the mineral. The work uses a comprehensive research method, which includes a system analysis and generalization of the experience of borehole hydromining, physical modeling of hydrodynamic processes, applied and bench research using industrial samples of technological equipment, as well as a mathematical modeling method - to establish dependencies between parameters well hydraulic mining. During the research and development of hydrodynamic mathematical models, the method of analyzing the processes of pulp flow over a conical surface was used, in which the stationary parameters of the flow process were determined and the influence of various factors on the uneven movement of slurry was investigated. In the proposed mathematical models, the dynamic characteristics of the process are sufficiently fully considered, and the parameters of the roughness of the solid boundary of the flow are also taken into account. On the basis of the conducted research, recommendations were developed for the use of well hydrotechnology depending on the state of the deposit and the composition of the rock, the method of selecting the parameters of the hydro-fracturing process and self-draining hydraulic transportation of zeolite-smectite tuffs along the bottom of the extraction chamber was investigated and improved. Proposed technological solutions for the installation of round-shaped mining chambers in thick layers of rock.
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