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CN-122021027-A - Mining medium-length hole blasting block size optimization method and system based on VCR mining method

CN122021027ACN 122021027 ACN122021027 ACN 122021027ACN-122021027-A

Abstract

The invention belongs to the technical field of mining, and discloses a method and a system for optimizing the block size of medium-length hole blasting in a mine based on a VCR mining method. The method comprises the steps of determining blasting parameters of filling length, dosage and delay time at two ends of a blast hole in blasting construction of a VCR mining method, calculating blasting block sizes of medium-deep holes in a mine, optimizing blasting parameters in blasting vibration of a underground chamber structure based on a calculation result, and performing simulation test on safety and stability of a mine structure based on a blasting parameter optimization result. The invention determines blasting parameters such as filling length, dosage, delay time and the like of two ends of a blast hole in the blasting construction of the VCR mining method, calculates and optimizes the blasting block of the medium-length hole of the mine, and improves the ore extraction efficiency. And the research of the influence of the blasting vibration on the structural stability of the underground chamber is carried out, the blasting vibration propagation rule is researched, the blasting vibration is reduced by optimizing blasting parameters, and the safety and stability of mine structures are ensured.

Inventors

  • SHAO BIN
  • LI DONG
  • ZHAO JIANBO

Assignees

  • 中铁十九局集团矿业投资有限公司

Dates

Publication Date
20260512
Application Date
20260202

Claims (10)

  1. 1. The mining medium-length hole blasting block optimization method based on the VCR mining method is characterized by comprising the following steps of: S1, determining blasting parameters of filling length, dosage and delay time at two ends of a blast hole in blasting construction of a VCR mining method, and calculating the blasting block of a medium-length hole in a mine; S2, optimizing blasting parameters in blasting vibration of the underground chamber structure based on a calculation result; s3, based on blasting parameter optimization results, performing simulation tests on safety and stability of the mine structure.
  2. 2. The method for optimizing the blast block size of a medium-length hole in a mine based on the VCR mining method according to claim 1, wherein in step S1, the stemming length of the blasthole comprises: the plugging length of the hole bottom is as follows: In the formula, For the plugging length of the bottom of the hole, Is the layered blasting height; the orifice blocking structure adopts a combination of particle stuffing and a water column energy absorption buffer mechanism, the thickness of a particle layer is more than or equal to 2 times of the diameter of a medicine bag, and the height of a water column is more than or equal to 15% of the depth of a hole.
  3. 3. The method for optimizing the block size of medium-length hole blasting in a mine based on the VCR mining method according to claim 2, wherein the water column energy absorption buffer mechanism comprises: (1) Controlling the phase change of dynamic fluid, injecting controllable micro bubbles or phase change materials into the water column, so that the fluid generates gas-liquid phase change or density jump at the moment of impact to form a multi-stage energy dissipation layer; (2) Designing a spiral diversion structure utilizing a vortex damping force model in the buffer cavity to force water flow to form directional vortex; (3) The damping force is maintained within a critical threshold throughout by feedback closed loop control.
  4. 4. A method of optimizing the blast block of a medium-length hole in a mine based on VCR mining method according to claim 3, wherein in step (1), the formula of the multi-stage energy dissipation layer is: In the formula, For the energy dissipation of the multiphase flow, In order to provide a specific heat capacity for the fluid, To raise the temperature Respectively the density of the liquid phase and the gas phase, Is the volume of the micro-bubbles, For the adiabatic index (adiabatic index), As an integral of the pressure, Integrating for time; In step (2), the vortex damping force model comprises the following non-linear model: In the formula, In order for the impact force to be applied, For the water flow rate, Is a linear damping coefficient, and the damping coefficient is the same as the linear damping coefficient, In order to be a coefficient of angular velocity of the vortex, Is the angular velocity of the vortex.
  5. 5. The method for optimizing the block size of medium-length hole blasting in a mine based on the VCR mining method according to claim 1, wherein in step S1, the calculation of the dose includes: The dynamic unit consumption is adjusted as follows: In the formula, For the purpose of dynamic unit consumption, the method comprises the following steps, Taking 1.2-1.5 of hard rock as the explosiveness coefficient of the ore rock; is the coefficient of the unit consumption and is equal to the coefficient of the unit consumption, Is a rock mass quality index; Air-spaced charge optimization to package length The air section occupies 20-30% of the hole depth.
  6. 6. The method for optimizing the block size of medium-length hole blasting in a mine based on the VCR mining method according to claim 1, wherein in step S1, the delay time is: In the formula, In order to delay the time period, the time period is set to be longer, Is the impedance coefficient of the rock mass wave, Is the vibration dosage of the rock, For the wave impedance of the rock, Is the elastic modulus; The blasting block calculation comprises the following steps of: In the formula, For the blocking fractal dimension, the larger the value, the more uniform the blocking.
  7. 7. The method for optimizing the blasting block size of a medium-length hole in a mine based on the VCR mining method according to claim 1, wherein in the step S2, blasting parameters in the blasting vibration of the underground chamber structure are optimized, comprising: (1) The method comprises the steps of self-similarity matching, dividing an image into a definition domain block and a value domain block, searching for self-similarity among blocks through affine transformation of scaling, rotation and translation, wherein the expression is as follows: In the formula, For the value of the self-similarity between the blocks, In the case of an image block, For an affine matrix, Is a translation vector; (2) An iterative function system IFS codes, and the local self-similarity inside the image is utilized for coding; (3) And quantifying the texture complexity of the block image by using the fractal dimension, wherein the expression is as follows: In the formula, For the block image texture complexity value, For the number of block-wise images, Is the radius of the block; (4) The Hurst index is used for blasting block time sequence analysis, and the expression is: In the formula, Is the Hurst index value.
  8. 8. The method for optimizing the blasting block size of a medium-length hole in a mine based on the VCR mining method according to claim 1, wherein in step S2, based on the blasting parameter optimization result, a simulation test is performed on safety and stability of a mine structure, comprising: group intelligence, searching a solution space through a particle position updating formula; Reinforcement learning, dynamically adjusting the blockiness based on the reward function.
  9. 9. The method for optimizing the block size of medium-length hole blasting in a mine based on a VCR mining method according to claim 8, wherein the group intelligence is to search the solution space by a particle position update formula, and the expression is: In the formula, Is the first Particle at The solution of the time-of-day position, In order to update the rate of the data, Is the first Particle at The solution of the time-of-day position, The method is divided into 1 st and 2 nd particle update speeds, The method is divided into 1 st and 2 nd particle updating distances, Is the first The position at which the particle attains the highest fitness, Is the first Particle at The position of the moment in time, The position when the highest fitness is obtained for the whole system; dynamically adjusting the blockiness based on the reward function is: In the formula, As a function of the fractal dimension of the block, For the initial block size adjustment factor, In order to dynamically adjust the rate of the light, In the form of a radius of the block, In order to adjust the coefficient of the coefficient, Is a dynamic block adjustment factor.
  10. 10. A VCR mining method-based mine medium-length hole blasting block optimization system, characterized in that the system implements the VCR mining method-based mine medium-length hole blasting block optimization method according to any one of claims 1 to 9, the system comprising: The blasting block size calculation module is used for determining the filling length, the dosage and the delay time blasting parameters of the two ends of a blast hole in the blasting construction of the VCR mining method, and calculating the blasting block size of a medium-length hole in a mine; The blasting parameter optimization module is used for optimizing blasting parameters in the blasting vibration of the underground chamber structure based on the calculation result; and the test verification module is used for carrying out a simulation test on the safety and stability of the mine structure based on the blasting parameter optimization result.

Description

Mining medium-length hole blasting block size optimization method and system based on VCR mining method Technical Field The invention belongs to the technical field of mining, and particularly relates to a method and a system for optimizing the block size of medium-length hole blasting in a mine based on a VCR mining method. Background Blasting is widely used in various industries of national economy production as an effective means of breaking rock in a short time. The blasting technique brings great economic benefit to people and also brings corresponding safety problems. Whether the blasting parameter setting is reasonable is an important parameter affecting the blasting effect. Before blasting is performed, operators need to evaluate the size of the blasting range, the size of the block produced by blasting, the change condition of the free surface during blasting operation, and the like in advance. Through the analysis, the problems and defects of the prior art are that in the process of calculating and optimizing the mine medium-deep hole blasting block size, the ore extraction efficiency is low, the blasting vibration effect is poor in optimizing blasting parameters, and the safety and stability of mine structures are low. Disclosure of Invention In order to overcome the problems in the related art, the embodiment of the invention discloses a method and a system for optimizing the block size of medium-length hole blasting in a mine based on a VCR mining method. The technical scheme is that the mine medium-length hole blasting block degree optimization method based on the VCR mining method comprises the following steps of: S1, determining blasting parameters of filling length, dosage and delay time at two ends of a blast hole in blasting construction of a VCR mining method, and calculating the blasting block of a medium-length hole in a mine; S2, optimizing blasting parameters in blasting vibration of the underground chamber structure based on a calculation result; s3, based on blasting parameter optimization results, performing simulation tests on safety and stability of the mine structure. In step S1, the stemming length of the stemming hole includes: the plugging length of the hole bottom is as follows: In the formula, For the plugging length of the bottom of the hole,Is the layered blasting height; the orifice blocking structure adopts a combination of particle stuffing and a water column energy absorption buffer mechanism, the thickness of a particle layer is more than or equal to 2 times of the diameter of a medicine bag, and the height of a water column is more than or equal to 15% of the depth of a hole. Further, the water column energy absorption buffer mechanism comprises: (1) Controlling the phase change of dynamic fluid, injecting controllable micro bubbles or phase change materials into the water column, so that the fluid generates gas-liquid phase change or density jump at the moment of impact to form a multi-stage energy dissipation layer; (2) Designing a spiral diversion structure utilizing a vortex damping force model in the buffer cavity to force water flow to form directional vortex; (3) The damping force is maintained within a critical threshold throughout by feedback closed loop control. In step (1), the formula of the multi-stage energy dissipation layer is: In the formula, For the energy dissipation of the multiphase flow,In order to provide a specific heat capacity for the fluid,In order to raise the temperature of the steel sheet,Respectively the density of the liquid phase and the gas phase,Is the volume of the micro-bubbles,For the adiabatic index (adiabatic index),As an integral of the pressure,Integrating for time; In step (2), the vortex damping force model comprises the following non-linear model: In the formula, In order for the impact force to be applied,For the water flow rate,Is a linear damping coefficient, and the damping coefficient is the same as the linear damping coefficient,In order to be a coefficient of angular velocity of the vortex,Is the angular velocity of the vortex. In step S1, a dose calculation is performed, including: The dynamic unit consumption is adjusted as follows: In the formula, For the purpose of dynamic unit consumption, the method comprises the following steps,Taking 1.2-1.5 of hard rock as the explosiveness coefficient of the ore rock; is the coefficient of the unit consumption and is equal to the coefficient of the unit consumption, Is a rock mass quality index; Air-spaced charge optimization to package length The air section occupies 20-30% of the hole depth. In step S1, the delay time is: In the formula, In order to delay the time period, the time period is set to be longer,Is the impedance coefficient of the rock mass wave,Is the vibration dosage of the rock,For the wave impedance of the rock,Is the elastic modulus; The blasting block calculation comprises the following steps of: In the formula, For the blocking fractal dimension, the