SU1760118A1 - Method for formation of opencast nonmining flank - Google Patents

Abstract

The invention relates to the mining industry and can be used in the open pit mining of mineral deposits. The purpose of the invention is to reduce the amount of overburden. The non-working side slope is formed from the slope and the upper and lower platforms with safety berms. On the side slope form stone-absorbing structures made in the form of barriers placed vertically. The first stone catcher structure is located at a height from the upper platform of the escarpment, and the subsequent ones are arranged at certain distances and determined from mathematical expressions.

Description

The invention relates to the mining industry and can be used in the open-pit mining of minerals and in other areas when creating excavations, pits, slopes in rocks.

Known ledge with safety berms, created at least 2-3 after the width of not less than 1/3 of the height of the slope, serve to protect the underlying horizons from the possible fall of stones from the slopes.

A common feature of the known and claimed methods of forming the non-working pit bead is the formation of a slope, the upper and lower areas of the ledge.

The disadvantage of this method is that. that the sites are created at least.

than 2-3 ledges and thereby reduce the technically achievable slope angle of the pit.

The closest in technical essence and the achieved result to the claimed method is a method of forming a ledge with stone-catching structures such as barriers on the areas of the ledges. ,

A common feature of the known method of forming a ledge with stone trapping structures at sites is the formation of a slope and the creation of stone-trapping structures.

The disadvantage of this method is that the stone catcher structures are located on the plots, occupying a part of them, and thus create prerequisites

oh oh

with

to reduce the technologically achievable pit angle.

The aim of the invention is to reduce the amount of overburden by increasing the technologically achievable pit angle due to the formation of slopes of ledges, unlimited in height, while ensuring the safety of mining operations on the lower horizons.

The essence of the invention is that, based on the equality of the width of the cumulative space of the stone-removing device, the width of the safety berm for the corresponding part of the slope, in the method of forming the non-working pit wall, including the formation of slopes, the upper and lower platforms and the construction of stone-trapping devices, stone-trapping the fixtures are made in the form of barriers placed vertically, the first being located at a height from the upper platform determined from the expression

(-Jctg a + 1),

TO

where h is the barrier height, m;

k is the ratio of the width of the safety berm to the height of the slope;

a is the slope of the slope, degrees, the subsequent place through the distance in height

H Ј hctg a,

and the last - at a distance from the lower platform

Hn {a, where a is the width of the lower platform of the step, m.

For example, in the construction of technically simple barriers with a height of e-4 m at an angle

slope 50 ° the first stone structure is located at a height of the top platform

Hi-4 (3ctg50 ° + lH4M,

subsequent distances in height

 -3-sgd500 10m,

those. at a technologically acceptable distance.

The maximum technologically attainable slope angle during implementation of the invention will be 72 °, i.e. practically, the stability limits of the pit angles of the quarries are reached.

Claims (1)

Invention Formula The method of forming the non-working side of the pit, including the formation of slopes, upper and lower platforms with safety berms and the construction of stone-catching devices, placed in parallel, characterized in that, in order to reduce overburden volumes, stone catchers are made in the form of barriers placed vertically, with the first The stone catcher is located at a height from the upper platform determined from the expression Hi-h (ctga + 1), where h is the barrier height, m; k is the ratio of the width of the safety berm to the height of the slope; a-angle of inclination of the slope, degrees, the next place through the distance in height H Ј ctg a, and the last is at a distance from the lower platform Ig 1a, where a is the width of the lower platform ledge, m.