A method to optimize and control the blast pile width of bench blasting in open-pit mines

An optimized control and step blasting technology, applied in blasting and other directions, can solve problems such as difficulty in predicting blasting heap width and shovel-loading coordination and optimization, and achieve the effects of ensuring the safety of slope mining, reducing the amount of drop and improving the efficiency of shovel-loading.

Active Publication Date: 2020-10-09
SINOSTEEL MAANSHAN INST OF MINING RES +2
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  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for optimally controlling the width of the pile in step blasting in open-pit mines in order to solve the technical problem that it is difficult to predict the width of the blast pile in the step blasting of

Method used

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  • A method to optimize and control the blast pile width of bench blasting in open-pit mines
  • A method to optimize and control the blast pile width of bench blasting in open-pit mines
  • A method to optimize and control the blast pile width of bench blasting in open-pit mines

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Example Embodiment

[0048] Implementation case: A large open-pit iron mine with an annual output of 5 million tons, with a blast hole diameter of 250mm, using powdered emulsion explosives; the hole spacing for ballast removal blasting is 6.5m-7m, and the row spacing b=5.6m-6m; ballast blasting holes The distance is 6m~6.5m, the row distance b=5.2m~5.6m; the width of the chassis resistance line is W=8m~8.5m, and the super depth is 2m. The detonation plan uses diagonal detonation, and the number of blast holes per blasting N=2 to 4 rows.

[0049] 1) When cleaning the ballast, h 1 The ratio of / W is controlled at 0.45~0.71. After a large number of field tests, the width L and h of the blast pile during single row blasting are obtained. 1 / W relation equation, L=-5.2268+39.199·(h 1 / W), such as image 3 The blast pile width L and h of the single-row hole blasting during ballast removal shown 1 / W diagram.

[0050] In multi-row blasting, the width of the blasting pile is L=-5.2268+39.199·(h 1 / W)+(N-1)×5.8...

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Abstract

The invention discloses an optimization method of controlling the width of a muck pile of bench blasting in an open-pit mine. A regression analysis method is adopted to obtain regression equations ofthe width L0 of the muck pile with a residue-clearing variable and a residue-remaining variable respectively in a single-row hole blasting process, when the residue is cleared, L0=A1 + B1 *(h1/ w), wherein A1 and B1 are regression coefficients; and when the residue is remained, L0=A2 + B2 * [ h1 /(w + s) ], wherein A2 and B2 are regression coefficients. Through a plurality of field test data and blast hole row spacing parameters, the width of the muck pile is predicted, field test verification is carried out, and then blasting parameter optimization is guided to be carried out according to thesite conditions. According to the method, blasting parameter optimization can be guided to be carried out, the width of the muck pile is well controlled, the front extension amount and the lower throwing amount of the muck pile are reduced, and the shovel loading efficiency is improved; and the mining safety in a side slope is guaranteed, in the meantime, the mining field side slope angle is improved, the rock stripping amount is reduced, and the mining blasting mining cost is reduced. The method has a good popularization and reference effect on the open-pit mining on an abrupt slope.

Description

technical field [0001] The invention belongs to the technical field of open-pit step blasting, and in particular relates to a method for optimally controlling the width of a step blasting pile in an open-pit mine. Background technique [0002] The technical process of open-pit mining is generally: perforation, blasting, shoveling, transportation and rock removal. The links of each process link, influence and restrict each other, constituting the most basic production cycle of open-pit mining. Blasting is an important process in open-pit mining. Through blasting operations, the whole ore rock is broken and loosened to form a certain shape of the gun pile, which provides working conditions for subsequent mining operations. The quality of the blasting work and the blasting effect directly affect the production efficiency and cost of the subsequent mining and loading operations; among them, the width of the blasting pile is an important control content, especially for mines mine...

Claims

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Application Information

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IPC IPC(8): F42D3/04
CPCF42D3/04
Inventor 刘为洲仪海豹杨海涛张西良辛国帅汪禹
Owner SINOSTEEL MAANSHAN INST OF MINING RES
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