Abstract
No founding to declare. Authors express gratitude for the help and consultations during work performing for Rector of Kryvyi Rih National University Professor Mykola Stupnik.
Highlights
MethodsThe drilling parameters were examined for rock dumps. The means of experimental drilling are drilling rig SKB-4; drill rods with a diameter of 42 mm and a length of 1.2 m; polyethylene pipes PND 63×8 and PND 70×8 with a length of 1.2 m; steel couplings for polyethylene pipes connecting; cone bits and RKS cutters
In underground ore mining, there are ores, which are broken, yet, not hoisted onto the surface
Basic results of research works in this field include: – creation of theoretical preconditions to develop designs of drilling strings and casing pipes; – determination of loads on casing pipes resulted from resistance to shifting pipes considering friction of casing pipes in relation to rocks; – development of methods to assess conditions of broken ores according to the mechanical penetration speed
Summary
The drilling parameters were examined for rock dumps. The means of experimental drilling are drilling rig SKB-4; drill rods with a diameter of 42 mm and a length of 1.2 m; polyethylene pipes PND 63×8 and PND 70×8 with a length of 1.2 m; steel couplings for polyethylene pipes connecting; cone bits and RKS cutters. The nature of the relationship between the speed of penetration of vertical and horizontal holes with the change in the axial force and their length for different modifications of the drilling tool is studied. The new laws of change in the hole drilling penetration speed depending on the complex of technological parameters of drilling are obtained. The authors offer a model describing the possibility of hole drilling in the broken massif as well as an optimized design of the string necessary for that. The obtained regularities determine mechanical and energy drilling indexes and which are necessary at the stage of designing when deciding upon practicability of extraction of in-situ left ores while enhancing mining technologies of ore drawing
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