Efficiency Improvement of Tunneling Operations Using the Drill and Fire System in the Donbass Coal Mines
Keywords:
DRILLING, DRILL AND FIRE SYSTEM, TUNNELING OPERATIONS, DRILL BITSAbstract
The studies related to the efficiency improvement of tunneling operations at the lowest cost are of great practical importance for the Donbass energy and coal complex. In particular, when tunneling by the drill and fire system, it is necessary to determine the methods and type of drilling equipment and the required tools (drilling device, rotary or rotary impact head, drill bits).
To accomplish this task, the experimental studies on drilling horizontal wells in a sandstone monolith with a strength of 125 MPa using various types of drill bits for percussion-rotary and rotational drilling were carried out, and the dependences of the drilling speed on the haulage pull for various modes of rotation speed and impact frequency were established. It is established that for this type of rock, the best ratio of drilling productivity and economic efficiency is possessed by RSH-140 rotary action bits. The results of the study were taken into account when purchasing tunneling equipment and were confirmed in practice during the operation of this equipment in mine conditions.
The dependences obtained can also be useful in further analytical studies or for testing the adequacy of
mathematical models.
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