SU1491103A1 - Method of blast-crushing of rock - Google Patents

Abstract

The invention relates to the mining industry and m. used in open cast mining sites with explosive preparation of rock mass. The goal is to improve the quality of crushing of the rock mass due to the formation of shielding zones in the array of adjacent horizons. An explosive ledge drills a crushing well. Between the last row of crushing wells and the upper ridge i of the newly formed escarpment slope, the wellhead of the contouring row (PR) is drilled. The axes of these wells intersect the planes of the newly formed escarpment slope at the level of the ln-wait for the lower boundary of the disturbed layer from the explosion of the wells of the overlying horizon and the bottom of the fractured ledge. The bottom of the wells of this row is lowered to the broken layer during the explosive crushing of rocks of this ledge with the Sterian rock in the massif of the underlying horizon. In wells OP place charge with a lower density of explosives. The crushing of wells and the wells of the OR are performed with a slowdown. First, the wells of the OR, then the bottom of the well, are blown up, and i. (L with

Description

The invention relates to the mining industry and can be used for opencast mining of mineral deposits with explosive preparation of the rock mass.

The aim of the inventions is to improve the quality of the crushing of the rock mass due to the formation of shielding zones in the array of adjacent horizons.

The drawing shows the ledges with the layout of the wells of the shielding row relative to the newly formed ledge slope and shielded-DICH zones in the horizon array, section.

The method is carried out as follows.

The wells of the shielding (contouring) row 1 on the ledge of the overlying 2 horizons are drilled vertically or inclined to the rear of the massif between the last row of 3 crushing wells and the upper ridge 4 of the newly formed slope 5 of the ledge. The wells of the screening row 1 are located in the pitan parallel to the last row of 3 wells, the axes of the shielding pn / ia I intersect the planes of the newly formed slope 5 of the ledge at the level between the lower boundary of the disturbed- layer 6 from the explosion of the wells of the overlying horizon and the bottom layer is destroyed ID of ledge 7, approximately 0.6-0.7 of its height, and the bottom

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wells of this row are lowered to the contact of the intrusive layer 6 with the parent rock in the array of the underlying horizon.

The screening row of 1 wells is drilled with a reduced distance between the wells. After the block has been drilled by the crushing wells and the shielding row 1, the explosives are charged, and a charge with a lower explosive density is placed in the shielding row 1 wells.

Crushing wells and shielding row 1 wells are blinded. The order of blasting is at the beginning of the well of the shielding row I, then the order of the crushing or the well 3i of the animation row 1 and the crushing well of the first row simultaneously, then any scheme and order of retardation with

Subsequently, after working out you

A method of blasting crushing of rock formations, including drilling on a blast ledge of crushing wells and around a number of wells, charging wells with explosive charges and occasionally blasting wells with advancing blasting of charges of the contour row, characterized in that In order to improve the quality of the mountain mass, due to the formation of shielding zones in the array of adjacent horizons, the wellhead of the end row is drilled between the last row of wells

on the horizon 2 in the upper part of the upper edge of the newly formed

These arrays of the underlying horizon remain from the explosion of explosive charges in the pipeline 8 wells of shielding row 1 short 9 shielding openings that extend parallel to the front of work and at a distance from one another, equal to the width of explosive approach, when mining the steps above the horizontal horizon 2. Short 9 shielding workings are used as additional

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five

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These are more reflective planes that create the effect of the impact of the shock waves of an explosion in the course of blasting operations on the ledges of the underlying horzontzm, which makes it possible to improve the quality of crushing of the rock mass.

Claims (1)

Invention Formula The method of blasting crushing of rocks, including drilling on the exploding ledge of the crushing wells and a number of wells, charging wells with explosive charges and occasional blasting of charges with advance blasting of charges of the contour series, improving the quality of the fraction-rock mass due to the formation of shielding zones in the array of adjacent horizons, the wellhead of the delineating row is drilled between the last row of 5 upper brow newly formed the slope of the ledge with the intersection of the plane of the newly formed slope of the ledge at the level between the lower boundary of the disturbed layer from the explosion of the wells of the overlying horizon and the bottom of the collapsed ledge and to the contact of the disturbed layer during explosive crushing of rocks of this ledge with the parent rock in the massif below the lying horizon 7 G 4 g-