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A method of one-time detonation of large-section tunnels

A detonation method and large-section technology, which can be used in tunnels, blasting, earthwork drilling and mining, etc., can solve the problem of large throwing range of flying stones, and achieve the effect of reducing the peak value of vibration

Active Publication Date: 2022-07-19
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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  • A method of one-time detonation of large-section tunnels
  • A method of one-time detonation of large-section tunnels
  • A method of one-time detonation of large-section tunnels

Examples

Experimental program
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Effect test

Embodiment 1

[0041] A one-time blasting method for large-section tunnels, which is suitable for the drilling and blasting 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 steps and lower steps, and the upper steps are arranged ahead of the lower steps; the distance between the upper steps and the lower steps 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 multiple hole vertical lines evenly along the vertical direction on the upper step, and arrange multiple hole horizontal lines on the upper step parallel to the tunnel floor to determine the hole base point; the intersection between the hole vertical line and the hole horizontal line is the hole...

Embodiment 2

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

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

[0058] S2. Go up step A 1 and down step A 2 The excavation contour lines of the peripheral holes Z are arranged.

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

Embodiment 3

[0069] Taking the track roadway in the west wing of a mine as an example, a single blasting method for a large-section tunnel is described in detail.

[0070] like 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 hole E used in the example is 113 mm, and the diameter of the expanded slot P hole is 42 mm. Using the large-section tunnel primary detonation method of the present invention in roadway excavation, the concrete construction steps include:

[0071] Step 1: Divide the driving section A into the upper step A 1 and down step A 2 Two sections, the height of the upper step is 2.90m.

[0072] Design excavation cycle length h=2.50m, go up to step A 1 Advance down step A 2 Distance s=4.00m.

[0073] Step 2: Go up Step A 1 The peripheral holes Z are arranged on the excavation outline, and...

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Abstract

A one-time blasting method for a large-section tunnel relates to the technical field of underground engineering blasting, and solves the problem of a large throwing range of flying stones during blasting. The method includes: dividing the tunneling section into upper steps and lower steps, the upper steps are arranged ahead of the lower steps; peripheral holes are arranged along the contour of the upper steps; The hole level line determines the hole base point; empty holes, reaming holes, auxiliary holes and intermediate holes are arranged on the upper step. The empty holes are arranged at the hole base point along the vertical line of the hole. The midpoint of the base point of the adjacent holes is arranged; the peripheral holes are arranged on the lower step, and multiple rows of auxiliary holes are arranged parallel to the roadway floor; all the blasting holes of the primary detonation section, the reaming holes, auxiliary holes and mid-point holes of the upper step are arranged according to the empty holes. The distance is detonated in order from near to far, and the auxiliary holes of the lower steps are detonated in order of distance from the bottom plate from far to near. This method has the advantages of high construction efficiency and less detonation times.

Description

technical field [0001] The invention relates to the technical fields of mining engineering and blasting, in particular to a method for detonating a large-section tunnel at one time, and a method for detonating a large-section tunnel at one time under the condition of using a coal mine allowable electric detonator. Background technique [0002] At present, there are only 5 delay sections for electric detonators allowed in coal mines, which are 0ms, 25ms, 50ms, 75ms and 100ms respectively. In the excavation construction of coal mine rock roadway, for large-section tunnels, multiple blasting is required to complete the blasting task of one section. For metal mine tunnels, large-section traffic tunnels or large-section underground chambers, sometimes limited by the number of detonator segments available, multiple detonations are required to complete the blasting task of one section. This greatly reduces the construction efficiency of tunnel blasting. [0003] In the process of...

Claims

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Application Information

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Patent Type & Authority Patents(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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