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A precise time-delayed hole-by-hole vertical undercut blasting method for large-diameter double-hole charge in rock roadway

A large-diameter, double-hole technology, which is used in blasting, earth-moving drilling, ground mining, etc., can solve the problems of not giving full play to the role of large-diameter holes, and the hole layout method cannot meet the cycle footage, and achieve good cutting and blasting. effect, increase the utilization rate of blast holes, and reduce the effect of clamping

Active Publication Date: 2022-06-21
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The existing vertical cutting blasting method for large-diameter holes is only limited to the hole part and fails to provide enough blasting compensation space, and does not give full play to the role of large-diameter holes; or the hole layout method cannot meet the needs of circular footage

Method used

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  • A precise time-delayed hole-by-hole vertical undercut blasting method for large-diameter double-hole charge in rock roadway
  • A precise time-delayed hole-by-hole vertical undercut blasting method for large-diameter double-hole charge in rock roadway
  • A precise time-delayed hole-by-hole vertical undercut blasting method for large-diameter double-hole charge in rock roadway

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Experimental program
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Effect test

Embodiment 1

[0043] Embodiment 1: a kind of rock roadway large-diameter double-hole charge accurate time-delayed hole-by-hole vertical undercut blasting method, concrete steps are as follows:

[0044] (1) According to the excavation section, design and drill several main undercut holes and several auxiliary undercut holes (see figure 1 ); wherein the main undercut hole is located at the center of the excavation section, the row spacing of the main undercut hole is equal to the column spacing of the main undercut hole, the auxiliary undercut hole is located on the central axis of the adjacent row of the main undercut hole and the auxiliary undercut hole It is located on the central axis of the main undercut holes in adjacent rows; the diameter of the auxiliary undercut holes is larger than that of the main undercut holes, and the depth of the auxiliary undercut holes is the same as that of the main undercut holes;

[0045] The auxiliary cut hole spacing is determined by numerical simulation...

Embodiment 2

[0070] Example 2: Taking the vertical deep-hole excavation and blasting project in the middle section of the roadway of Yuxi Mining Dahongshan Copper Mine 285 as an example, the cross-sectional size of the roadway is 4.4×3.7m 2

[0071] A method for accurate time-delayed hole-by-hole vertical undercut blasting with large-diameter double-hole charge in rock roadway, the specific steps are as follows:

[0072]

[0073] (1) According to the excavation section, design and drill several main undercut holes and several auxiliary undercut holes (see figure 1 and figure 2 ); wherein the main undercut hole is located at the center of the excavation section, the row spacing of the main undercut hole is equal to the column spacing of the main undercut hole, the auxiliary undercut hole is located on the central axis of the adjacent row of the main undercut hole and the auxiliary undercut hole It is located on the central axis of the main undercut holes in adjacent rows; the diameter...

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Abstract

The invention relates to a large-diameter double-hole hole-by-hole vertical cutting blasting method with precise time-delay and hole-by-hole vertical cutting, and belongs to the technical field of underground roadway excavation and blasting. According to the excavation section, the present invention designs and drills several main cutting holes and several auxiliary cutting holes; wherein the row spacing of the main cutting holes is equal to the column spacing of the main cutting holes, and the auxiliary cutting holes are located in adjacent rows. On the central axis of the cutting hole and the auxiliary cutting hole is located on the central axis of the main cutting hole in the adjacent row; the diameter of the auxiliary cutting hole is larger than that of the main cutting hole, and the depth of the auxiliary cutting hole is the same as that of the main cutting hole The same depth; design the charge amount in the main cut hole and the auxiliary cut hole, and charge the main cut hole and the auxiliary cut hole; design the delayed explosion time of the digital electronic detonator, and precisely control it through the digital electronic detonator The auxiliary cut holes are detonated hole by hole to form cracks, and then the main cut holes are precisely controlled by digital electronic detonators to detonate symmetrically hole by hole. The invention can improve the cutting blasting depth and cycle footage.

Description

technical field [0001] The invention relates to an accurate time-delayed hole-by-hole vertical undercut blasting method for large-diameter double-hole charging in rock roadways, and belongs to the technical field of underground roadway excavation and blasting. Background technique [0002] Roadway excavation occupies a major part of the amount of underground mining and excavation in mines, and is the first process of mining. At present, the burial depth of roadway excavation in my country is gradually increasing, and the cross-sectional area of ​​roadway excavation is also gradually increasing. However, the cycle footage of roadway excavation is low, the average circulation rate is about 75%, and the monthly average cycle footage is about 80m, which cannot meet the Excavation workload needs now. [0003] According to the size of the excavation section, it can be divided into the following three categories, the section area is less than 10m 2 It is called small section excav...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F42D1/00F42D1/08F42D3/04F42D1/05E21C41/16
CPCF42D1/00F42D1/08F42D3/04F42D1/05E21C41/16
Inventor 李祥龙武永博王建国张智宇黄永辉左庭陶子豪张其虎
Owner KUNMING UNIV OF SCI & TECH
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