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Method for determining maximum single-shot explosive quantity during blasting

A technology to determine the method and dosage, which is applied in the field of materials to achieve the effects of improving safety, controlling mining costs and reducing risks

Active Publication Date: 2021-06-29
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The present invention aims at the problem of damage to adjacent cemented filling bodies by blasting vibration in the prior art, and provides a method for determining the maximum single-shot explosive charge during blasting. The present invention makes cemented filling body test pieces according to mine filling conditions, and adopts SHPB impact tests to obtain The maximum dynamic compressive strength σ at the stage of elastic deformation of graded tailings cemented filling mass emax and the maximum dynamic compressive strength σ when the cemented filling mass of graded tailings is completely destroyed pmax , and then based on the combination of the one-dimensional stress wave propagation formula and the Sadovsky formula of on-site monitoring regression, determine the maximum segmental synchronous charge corresponding to the stable area, damaged area and damaged area of ​​filling bodies with different strengths

Method used

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  • Method for determining maximum single-shot explosive quantity during blasting
  • Method for determining maximum single-shot explosive quantity during blasting
  • Method for determining maximum single-shot explosive quantity during blasting

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Embodiment 1

[0048] Embodiment 1: a method for determining the maximum single shot charge during blasting, the specific steps are as follows:

[0049] (1) According to the one-dimensional longitudinal wave propagation theory of a slender rod, the relationship between the force on the particle and the velocity of the particle

[0050] σ=-ρc 0 v (1)

[0051] In the formula: the negative sign means that the direction of stress and velocity is opposite during the propagation of stress wave, ρc 0 is the wave impedance of the propagation medium, ρ is the density of the medium, kgm -3 , c 0 is the propagation velocity of one-dimensional longitudinal wave in the medium, ms -1 ;

[0052] Equation (1) deduces

[0053]

[0054] σ emax =-ρc 0 v emax (3)

[0055] σ pmax =-ρc 0 v pmax (4)

[0056] In the formula: ρ is the medium density, kgm -3 , c 0 is the propagation velocity of one-dimensional longitudinal wave in the medium, ms -1 ; σ emax is the maximum dynamic compressive stre...

Embodiment 2

[0086] Embodiment 2: This embodiment takes the blasting site of Dahongshan Copper Mine as an example;

[0087] A method for determining the maximum single shot charge during blasting, the specific steps are as follows:

[0088] According to the proportioning parameters of the cemented ore pillars of the B10-15 line in the middle section of 285, the strengths of the cemented filling body of the layered filling are 1.75Mpa and 2.34Mpa respectively, so only the results of these two strengths are listed. In Table 1,

[0089] According to the selected Sadovsky empirical formula, combined with formulas 14-28 and table 1, calculate the positions of filling bodies with different strengths at different detonation center distances (to verify the maximum section charge of the first mine blasting design in the stope, etc. (Calculated from effective detonation heart distance) to reach the maximum single-shot dose required for stability, and the specific dose control range is shown in Table...

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Abstract

The invention discloses a method for determining the maximum single-shot explosive quantity during blasting, and belongs to the technical field of blasting engineering. The method comprises the steps: manufacturing a cemented filling body test piece according to the mine filling condition, and obtaining the maximum dynamic compressive strength sigma<emax> of the graded tailing cemented filling body in the mass point elastic deformation stage and the maximum dynamic compressive strength sigma<pmax> when the mass points of the graded tailing cemented filling body are completely damaged through an SHPB impact test; based on the combination of a one-dimensional stress wave propagation formula and a Sadov's formula of field monitoring regression, determining a stable area and a damaged area of the filling bodies with different strengths, and determining the maximum-section simultaneous explosive quantity corresponding to the damaged area.

Description

technical field [0001] The invention relates to a method for determining the maximum single shot charge amount during blasting, and belongs to the field of material technology. Background technique [0002] The control of blasting charges is very important for underground blasting operations. The parameters of the blasting operation are usually determined through a series of blasting funnel experiments and empirical formulas. There are large errors and randomness, and it cannot be controlled according to the actual lithology and site conditions. Therefore, there will be large errors, resulting in on-site blasting. The maximum single shot dose is inaccurate, resulting in over-excavation and under-excavation, and even affects the stability of the surrounding cemented filling body, leading to loose and collapsed filling bodies, which seriously affects the progress of mining work. Contents of the invention [0003] The present invention aims at the problem of damage to adjace...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/20G16C10/00G16C60/00G06F119/14
CPCG06F30/20G16C10/00G16C60/00G06F2119/14
Inventor 王建国陶子豪张智宇左庭杨长辉赵泽虎李强方程周青莲姚永鑫
Owner KUNMING UNIV OF SCI & TECH
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