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Method for open-air deep-hole bench pre-cracking hole hole-by-hole detonation pre-cracking blasting cracking in complex environment

A complex environment, pre-splitting blasting technology, applied in blasting and other directions, can solve the problems of high degree of weathering, high drop, steep slope angle, etc., and achieve the effect of good stability, small vibration and small disturbance

Active Publication Date: 2020-02-11
KUNMING UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The invention aims at the open-pit deep hole step pre-splitting blasting in the complex environment. The steps or slopes of the open-pit mine have the characteristics of high drop, steep slope angle and high degree of weathering. It is necessary to consider the stability of the surrounding rock and the surrounding complex environment. For structures, a method of initiation and pre-splitting of open-pit deep-hole step pre-splitting holes hole by hole in a complex environment is proposed. This method can improve the pure operation rate of the drilling rig and the unit ore dropping amount of the drilling hole, and improve the energy utilization rate of explosives and Improving the structural parameters of the stripping process (mainly increasing the slope angle of the working slope) can solve the vibration problem of the surrounding rock around the open-pit deep hole steps, protect the integrity of the surrounding rock mass, control its workload, and obtain flat and smooth rock wall, reduce over-excavation and other problems, and ensure the stability of the surrounding rock in pre-splitting blasting of steps

Method used

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  • Method for open-air deep-hole bench pre-cracking hole hole-by-hole detonation pre-cracking blasting cracking in complex environment
  • Method for open-air deep-hole bench pre-cracking hole hole-by-hole detonation pre-cracking blasting cracking in complex environment
  • Method for open-air deep-hole bench pre-cracking hole hole-by-hole detonation pre-cracking blasting cracking in complex environment

Examples

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Effect test

Embodiment 1

[0036] Example 1: Such as Figure 1~4 As shown, a method for forming joints by hole-by-hole initiation and pre-split blasting in open-air deep-hole bench pre-split holes in a complex environment is as follows:

[0037] A method for forming joints by hole-by-hole initiation and pre-split blasting in open-air deep-hole bench pre-split holes in complex environments, the specific steps are as follows:

[0038] (1) The inclined pre-split holes are evenly arranged on the contour line of the open-air deep-hole step excavation foundation pit under the complex design environment, and the axially uncoupled air gap charge device is set in the pre-split holes; the complex environment is that there are residential buildings, Cultural relics and other surrounding structures, etc. The hole diameter of the pre-split holes is 50~200mm, and the hole spacing of the pre-split holes is 8~12 times the diameter of the pre-split holes. The rock mass is intact as the larger value, and the rock mass is bro...

Embodiment 2

[0051] Embodiment 2: The complex environment of this embodiment is the current status of the application of pre-split blasting in the Yunnan Hualian zinc-indium open-pit mine;

[0052] The method of step-by-hole initiation and pre-split blasting of open-air deep-hole step pre-split holes in complex environments is basically the same as that in Example 1, except that the hole diameter of the pre-split holes is 120mm, and the hole spacing of the pre-split holes is 8 times the diameter of the pre-split holes , The delay time of the digital electronic detonator of the pre-split hole is 12ms; the horizontal distance between the pre-split hole and the main blast hole of the adjacent row is 4.4m, and the horizontal distance between the pre-split hole and the main blast hole of the adjacent row is 2m; The hole diameter is 140mm, the distance between the buffer hole and the pre-split hole is 4.4m, and the pitch of the buffer hole is 5m; the bottom of the buffer hole is filled with loose sl...

Embodiment 3

[0053] Embodiment 3: The complex environment of this embodiment is the use of hole-by-hole initiation of open-pit steps in a mine;

[0054] The method of step-by-hole initiation and pre-split blasting of open-air deep-hole step pre-split holes in complex environments is basically the same as that in Example 1, except that the hole diameter of the pre-split holes is 120mm, and the hole spacing of the pre-split holes is 10 times the diameter of the pre-split holes. , The delay time of the digital electronic detonator of the pre-split hole is 12ms; the horizontal distance between the pre-split hole and the main blast hole of the adjacent row is 3m, and the horizontal distance between the pre-split hole and the main blast hole of the adjacent row is 2.5m; The hole diameter of the buffer hole is 120mm, the distance between the buffer hole and the pre-split hole is 3m, and the pitch of the buffer hole is 4m; the bottom of the buffer hole is filled with loose slag with a height of 1.5m, ...

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Abstract

The invention relates to a method for open-air deep-hole step pre-cracking hole hole-by-hole detonation pre-cracking blasting cracking in a complex environment, and belongs to the technical field of blasting. According to the method, pre-cracking blasting is carried out along a final boundary line and namely a design contour line of bench blasting, a pre-crack hole should be ahead of a main explosion hole for 100 ms or above to be detonated, a crack is formed through blasting in advance between the main explosion hole and a protected rock mass, after the pre-cracking crack is formed, a bufferhole explosion group and a main hole explosion group are detonated, the pre-cracking crack can reduce the blasting seismic effect of the main hole explosion group, the damage of the surrounding rock mass is slight, the integrity of the rock mass is protected, the workload is reduced, the vibration on surrounding civil houses, cultural relics and other surrounding structures is small, the disturbance on the reserved rock mass is small, the stability is good, the crack forming effect is good, a flat and smooth rock wall surface can be obtained, the overexcavation is greatly reduced, and the stability of surrounding rock is maintained.

Description

Technical field [0001] The invention relates to a method for forming joints by hole-by-hole blasting and pre-splitting blasting in open-air deep-hole stepped pre-split holes under complex environments, and belongs to the technical field of engineering blasting. Background technique [0002] During the blasting operation, because the explosives explode in the blast hole, a powerful shock wave and high-pressure gas will be generated, which will cause the surrounding rock mass to be broken and cracked. Many projects in our country, such as open-pit mine slopes, hydraulic constructions, traffic cuttings, building foundation pits, tunnels and underground structures, need to control the blasting boundary, avoid over-excavation and under-excavation, and also need to open The rock mass on the excavation boundary can be kept as complete and stable as possible. [0003] Boundary controlled blasting currently includes pre-split blasting and smooth blasting. The former is to drill a row of p...

Claims

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Application Information

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IPC IPC(8): F42D1/00F42D1/045F42D1/08F42D3/04
CPCF42D1/00F42D1/045F42D1/08F42D3/04
Inventor 李祥龙张其虎袁芝斌侯猛王子琛母永烨吴霄张希段应明
Owner KUNMING UNIV OF SCI & TECH
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