SU1120760A1 - Method of preventing dynamic phenomena in mine workings - Google Patents

Abstract

METHOD FOR PREVENTING daNAMIChESKIH Phenomena in mines, comprising drilling holes to charge zhanie charge rows of explosives and blasting to form discharge slots, characterized in that, in order povshteni zffektivnosti effect vzryua when drilling workings by using a fracture, unloading holes drilled paired parallel each other in the series of each approximated pair in the area of exposure in different directions, at the same angle to the exposure and placed them in the plane to Each row is parallel to the central sec (a third of the angles between the outcrops and the normal to it, the holes are charged through one charge of explosive with directional action in the plane of the rows.

Description

one

The invention relates to the mining industry and can be used to combat the dynamic forms of the manifestation of mining pressure during mining operations.

There is a known method for controlling dynamic effects, including drilling wells, loading them with camouflage charges and blasting these charges f 1 J.

The disadvantage of this method is its inefficiency in strong monolithic rocks.

There is also a known method of preventing dynamic phenomena in mountain sledding, which includes waking holes, charging charges with explosives and blasting to form discharge slots C22.

The disadvantage of this method is also low efficiency.

The purpose of the invention is to increase the efficiency of an explosion when excavating workings through the use of fracturing.

The goal is achieved by the fact that, in the method of preventing dynamic phenomena in mines, including drilling holes, charging bursts of explosives and blasting to form relief slots, unloading holes with double, parallel close rows, align the holes in rows of rows. on the outcrop in different directions, at the same angle to the outcropping, and position them in the plane of each row and parallel in the central sectors of one third of the angles between the outcrops and normal to it, the boreholes are charged through one charge of explosive of directional action in the plane of the rows.

FIG. 1 shows the placement of bore holes in the production area of FIG. 2 shows section A-A in FIG. one; in fig. 3 is a section bb of fig 1; in fig. 4 shows a section B-B in FIG. one.

In the bottom hole with the axis of symmetry 1, the outcrop of the rock mass is drilled with holes 2 and 3 tilted up. The drilled holes are paired with parallel contiguous rows and are oriented in the rows of each contiguous

07602

pairs in different directions at the same angle to the outcrops with the location in the plane of each row in the central sectors the size of 5 is the third part of the angle between the outcrops of the array and the normal to it. The length of the holes is determined according to the required depth of discharge. Simultaneously drill t 4 holes

About the cycle. Holes 2 are mounted; through intervals, sections 5 of directional action with filling of the gaps between them by the stemming 6. Holes 3 remain uncharted. Over 5 rows in boreholes 2 explode in directions 7 (with a cumulative effect).

The number of discharge rows consisting of bore-holes 2 and 3, their number in rows, the power of charges is determined by

0 from the condition of a steady state of development at the maximum possible fracturing by experimental blasting with a sequential change in charge parameters, charges in the holes 4

5 explode relative to each other with a millisecond slowdown. The implementation of these operations. Unloading, the array provides the formation of planes pointing systems

0 cracks with a fall and a strike in the directions 8. The communicative effect of an explosion in directions 7 provides for the formation of induced crack systems with a strike that coincides with the plane of the rows while simultaneously interacting the explosion along two adjacent rows of each pair over the entire width of the outcrop.

The direction of the holes in the rows of each

0 approaching pairs in different directions with their arrangement in the row plane and parallel and placing in sectors in the third part of the angles between the outcrop and the normal to it provides

5 in two mutually intersecting directions along perpendiculars to the shpugrams of each row, the angle of meeting of system 1 1 of cracks with exposure, limited by the sector of the middle third of the specified angles.

0 The use of this method of preventing dynamic phenomena in mine workings will make it possible to increase the effectiveness of the fight against dynamic phenomena during mining workings.

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Claims (1)

METHOD FOR PREVENTING DYNAMIC PHENOMENA IN MINING, including drilling holes, loading explosives with charges and blasting to form discharge gaps, characterized in that, in order to increase the efficiency of the explosion when excavating through workings using fractures, the discharge boreholes are drilled in paired, parallel they orient the holes in the rows of each close-couple in the outcrop area in different directions, at the same angle to the outcrop, and place them in the plane of each row and in parallel in the central sectors the size of the third part of the angles between the exposure and the normal to it, the holes are charged through one with explosive charges of directional action in the plane of the rows.