The method of building side walls of sandy soil in open-pit mines

Abstract

The invention provides a slope widening method of an open-pit sandy soil slope. The slope widening method comprises the following steps: step a, stripping sandy soil by a set height downwards on one side, close to the slope surface, of the top of the slope to form a step; step b, moving outwards towards the slope surface by a set width, and continuously stripping the sandy soil by the set width downwards to form a new step; and step c, repeating the step a and the step b, and when the height of the left sandy soil of the slope is smaller than the maximum digging height of an electric shovel, stripping the left sandy soil by use of the electric shovel to form a bottommost step. According to the slope widening method of the open-pit sandy soil slope, a combined section of a plurality of small steps is formed from top to bottom, and when the height of the left part after the sandy soil is stripped is smaller than the maximum digging height of the electric shovel, the left sandy soil is directly stripped by use of the electric shovel. Compared with the prior art, the landslide can be prevented, and therefore, a safety protective flat plate adopted in the prior art for guaranteeing safety can be cancelled, and consequently, the bottom mining limit is widened and the resource recovery rate is increased.

Description

technical field [0001] The invention relates to a technology for stabilizing sandy soil sides and slopes in open-pit mines, in particular to a method for expanding sides of sandy soil sides in open-pit mines. Background technique [0002] The mining of open-pit mines is to remove the topsoil covering the upper part of the ore body and the surrounding rocks in an open space within a certain range, and to mine the ore. The problem of slope stability is the main problem of open-pit mining. one. [0003] figure 1 It is a schematic diagram of the step structure of an open-pit mine. The side of a large-scale open-pit mine is composed of two or three steps and sections, plus transportation roads and security flat plates. The steps above are composed of the following elements: upper flat plate 1, lower flat plate 2, slope surface 3, slope top line 4, slope bottom line 5, height h, and slope angle α. [0004] For the merging of soft rock steps or sandy soil steps, the electric sho...

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Problems solved by technology

[0005] In the prior art, there are the following defects in the direct extension of the edge by the electric shovel: 1) Since the steps are high, exceeding the rated mining height of the electric shovel, there are potential safety hazards when using the electric shovel to directly extend the edge; 2) Since the edge is a sandy soil slope, If you use an electric shovel to directly expand the side, the resulting slope angle is large (about 70 degrees), and the slope is steep, so the hidden danger of landslide is great; Affects the width of the bottom border

If one more security plate is added, the bottom boundary will move 10 meters to the stope, and the 10-meter-wide coal will be suppressed by the end side, which will affect the coal mining volume

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