One-time detonation method for large-section tunnel

A detonation method and large-section technology, which are used in tunnels, blasting, earth-moving drilling, etc., can solve the problem of large throwing range of flying stones, and achieve the effects of reducing the concentration of charges, reducing blasting vibration, and reducing vibration peaks.

Active Publication Date: 2021-08-03
SHANDONG UNIV OF SCI & TECH +4
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] In order to solve the problem of large throwing range of flying rocks during the blasting process, improve the blasting construction efficiency of large-section tunnels, and effectively reduce the damage of blasting flying rocks to equipment near the excavation face

Method used

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  • One-time detonation method for large-section tunnel
  • One-time detonation method for large-section tunnel
  • One-time detonation method for large-section tunnel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] A method for primary detonation of large-section tunnels, which is suitable for drilling and blasting excavation construction of large-section tunnels in mines, especially under the condition of using an integrated drilling, loading, and transporting tunneling machine. The steps include:

[0042] S1. Divide the excavation section into upper and lower steps, and the upper step is arranged ahead of the lower step; the distance between the upper step and the lower step is greater than the length of the excavation cycle.

[0043] S2. Peripheral holes are arranged along the excavation contour of the upper step, and explosives are installed in the peripheral holes.

[0044] S3. Arrange a plurality of hole vertical lines evenly along the vertical direction on the upper step, and arrange a plurality of hole horizontal lines parallel to the tunnel floor on the upper step to determine the base point of the hole; the intersection point between the hole vertical line and the hole fl...

Embodiment 2

[0056] combine Figure 1 to Figure 3 A method for one-time detonation of a large-section tunnel is described in detail, and the steps may specifically include:

[0057] S1. Divide the excavation section A into upper steps A 1 and down step A 2 Two steps, go up to step A 1 A step ahead 2 A certain distance s, the length of s is greater than the length s of a tunneling cycle 1 ;

[0058] S2. Go up the steps A 1 and down step A 2 The excavation contour line arranges the peripheral hole Z.

[0059] S3. Go up the steps A 2 Perpendicular line B 0 On both sides of , symmetrically arrange i parallel to the vertical line B 0 Hole Perpendicular B 1 , B 2 , B 3 ,...,B i , i≥2,; on the upper step A 2 The horizontal line C of the hole is arranged parallel to the tunnel floor 1 、C 2 、C 3 ,...,C j , j≥1; hole flat line C j and perpendicular line B 0 The intersection point is hole base point B 0 C j , hole perpendicular B 1 , B 2 , B 3 ,...,B i with hole level C 1 ...

Embodiment 3

[0069] Taking the track lane at the west wing of a certain mine as an example, a method of primary detonation for a large-section tunnel is described in detail.

[0070] Such as Figure 4 As shown, the roadway is a straight wall semi-circular arch section, the excavation width is 5.90m, the excavation height is 5.45m, the wall height is 2.50m, and the excavation section area is 28.4m 2 . The diameter of the empty hole E used in the example is 113mm, and the diameter of the expanded hole P is 42mm. Using the large-section tunnel primary detonation method of the present invention in roadway excavation, the specific construction steps include:

[0071] Step 1: Divide the excavation section A into upper steps A 1 and down step A 2 Two sections, the height of the upper step is 2.90m. Design cycle length of excavation h=2.50m, upper step A 1 A step ahead 2 Distance s=4.00m.

[0072] Step 2: Go up Step A 1 The surrounding holes Z are arranged on the excavation contour line, ...

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Abstract

The invention discloses a one-time detonation method for a large-section tunnel, and relates to the technical field of underground engineering blasting. The problem that the flying stone throwing range is wide in the blasting process is solved. The method comprises the steps that a tunneling section is divided into an upper step and a lower step, and the upper step is arranged ahead of the lower step; peripheral holes are formed along the contour of the upper step; a plurality of hole vertical lines are arranged on the upper step in the vertical direction, a plurality of hole horizontal lines are arranged in the mode of being parallel to a roadway bottom plate, and hole base points are determined; empty holes, groove expanding holes, auxiliary holes and middle division holes are formed in the upper step, the empty holes are formed in the hole base points along the hole vertical lines, the groove expanding holes are evenly formed around the empty holes, and the middle division holes are formed along the middle points of the adjacent hole base points; peripheral holes are formed in the lower step, and multiple rows of auxiliary holes are formed in the mode of being parallel to the roadway bottom plate; and all blast holes of the section are detonated at a time, the groove expanding holes, the auxiliary holes and the middle division holes of the upper step are detonated according to the distance from the empty holes from near to far, and the auxiliary holes of the lower step are detonated according to the distance from the bottom plate from far to near. The method has the advantages of high construction efficiency, low detonation frequency and the like.

Description

technical field [0001] The invention relates to the field of mining engineering and blasting technology, in particular to a method for primary detonation of a large-section tunnel and a method for primary detonation of a large-section tunnel under the condition of using an electric detonator permitted in coal mines. Background technique [0002] At present, there are only 5 delay periods for electric detonators allowed in coal mines, which are 0ms, 25ms, 50ms, 75ms and 100ms. However, in the excavation construction of rocky roadways in coal mines, for large-section tunnels, multiple detonations are required to complete the blasting task of a section. For metal mine tunnels, traffic large-section tunnels or large-section underground chambers, sometimes limited by the number of available detonators, multiple detonations are required to complete the blasting task of a section. This greatly reduces the construction efficiency of tunneling and blasting. [0003] In the process ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F42D3/04F42D1/00E21D9/00
CPCF42D3/04F42D1/00E21D9/006
Inventor 王海亮高尚刘泉维张勇闫莎莎李维洲周广柱李晨睿杨波周明聪赵军丁新宇
Owner SHANDONG UNIV OF SCI & TECH
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