SU1525273A1 - Method of breaking pillars - Google Patents

Abstract

This invention relates to underground mining. The goal is to increase the safety of work by preventing the formation at the side of the pillar from collapsing as a result of reducing the power of explosives charges by using compression energy of the pillar, reducing the labor costs for assembling pins and the cost of ore as a result of reducing the length of additional wells and explosive consumption. In the beating part of the pillar, the contouring wells drill parallel to the sides of the retained part of the pillar. An additional row of wells is drilled under the whole. The wells are charged with explosives, while additional wells are charged under the stored part of the rear sight in the areas from the bottom of the wells to the intersection of their projections on the vertical plane. First of all, charges are blown up under the whole, and then, with a short deceleration, explosive charges in delineated rows of wells are blown up. In this case, the side parts of the pillar are destroyed and ore is crushed from these parts. The reduced power in the contouring rows reduces the seismic effect of explosions on the rear sight. All the conserved part of the pillar is under the pliable layer, which provides unloading of the pillar. 2 Il.

Description

The invention relates to the mining industry and can be used in the underground mining of mineral deposits.

1Devents of the invention - improving the safety of work due to the prevention of airfoil on the side surface of the rear sight as a result of a decrease in the power of explosive charges due to the use of compression energy of the rear sight, reduction of labor costs for the assembly of stabbings and cost of ore as a result of reducing the length of additional wells and the consumption of explosives .

FIG. Figure 1 shows a vertical section of the purification chambers at the stage of mineral cutting and contouring of the pillars after detonation of squaline charges in the soil at 1) T |: with a backfilling chamber, FIG. 2 shows section A-A in FIG. one.

The method is carried out by performing the following operations.

The preparation of the cleaning chamber I for mining consists in holding the center of the chamber of the drilling excavation 2 and along the boundaries of the chamber two delivery openings 3 and 4 (Fig. 1). Drilling production 2 with delivery 3 and 4 is knocked down by exhaust niches 5.

The extraction of minerals in chamber 1 is carried out by fans of concealment, which are drilled from output 2. At this (1) (D) in | 6 wells, the directed and CTOponv inter-dimensional pillars 7, 1-drilled 1-) t; ui contour chambers 1. The magnitude of the shortage head:; sieves from specific mining and geological and mining

sd

N5 SL N3

WITH

technical conditions and applied parameters () in drilling and blasting operations.

Ili.c. ie ore blasting in adjacent cleaning chambers 1 along the boundaries of the pillar 7 with the chamber; 1 mi 1 of the delivery workings 3 and 4 of the drill are parallel contiguous rows of 8 sknazhii, delineating the inter-chamber pelic 7 1 FIG. 2). At least one additional row of wells from delivery workings 3 and 4, namely from wells 3 and 4, drill 9 rows of parallel wells in the soil for the whole 7. Well wells in additional rows 9 are only under the stored part of the rear sight 7. i. e. charge each well in rows 9 from its bottom 10 to the point 11 of the intersection of their projections on the vertical plane on the soil below the point 7. Nearby wells ti in the contour rows 8 charge menypei mass than the wells in the fans, to the contour of the bottom 12 of the camera 1.

() bottom)) explosively borehole charges in wells of rows 9 under the whole 7, with the formation of: first layer 13 soil under the whole 7. Soil sections located under the side portions 14 of the rear sight 7, after forming the compliant layer 13 preserving rigidity. Pos: First vertical.p-on deformation of the saved part of the target; 7, occurring at the expense of the potential -: 1) not the compression of the pillar 7 and the deflection of the blood (1 and 1G). provides vertical loading and initiates the destruction of the lateral part of the Teii 14 of the target 7. With a short deceleration, the value of KiiTOjiori) depends on the specific T (), 1o | -aic and () pH () - technical us-. loBiiii. pg 101peniyu to well explosions in () dah mr1 well charges in

five

0

five

0

five

okiturivayuschih rows of 8 wells. The blasting of borehole charges in rows 8 ensures the development of the process of destroying the side parts 14 of the rear sight and striking ore from these parts. The blasting of downhole charges of reduced power in rows 8 reduces the seismic effect of the explosions on the rear sight 7. All the remaining part of the rear sight 7 is located above the compliant layer 13, which provides unloading action. 7 and prevents the destruction of the edge parts of the moftable pillar by mountain pressure.

Claims (1)

Invention Formula The method of breaking down the pillars, including drilling the contouring wells in the beating part of the rear sight, parallel to the sides of the stored part of the rear sight, drilling in the pillars of an additional row of wells, loading the wells with explosives and blasting them, different in that. that, with the aim of improving the safety of work by preventing the stabbing on the side surface of the pillar as a result of reducing the power of explosives charges by using the compression energy of the pillar, reducing the labor costs for assembling pins and the cost of ore as a result of reducing the length of additional wells and explosive consumption. An additional row of wells is drilled under the whole, these wells are loaded under the co-section with the o-part of the rear-carcass in the areas from the slopes to the intersection of the x projections on the vertical plane into the first one. the queue explodes the explosive charges beneath the whole, then with a short substitution explosive charges explode in the contour rows of wells. H. / I t 10 15 11 10 Fi.g.1 YU 910119 3 11 10 S 7 10 8ЮП911 9 10 8 Fi2.g