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Digging method for preventing strong or strong rock burst on active face

A tunnel face and rockburst technology, which is applied in the field of excavation with strong or extremely strong rockburst prevention and control, to ensure personal safety, ensure construction progress, and improve the ability to resist rockburst impact.

Active Publication Date: 2009-10-21
POWERCHINA HUADONG ENG COPORATION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] There seem to be many active control methods for rockburst on the face of the mine, including: water softening, drilling stress relief holes, stress relief blasting, etc. Practice shows that the above methods may not all achieve satisfactory results

Method used

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  • Digging method for preventing strong or strong rock burst on active face
  • Digging method for preventing strong or strong rock burst on active face
  • Digging method for preventing strong or strong rock burst on active face

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Embodiment 1: Excavation method for extremely strong rockburst prevention and control on the face, characterized in that the specific steps include,

[0028] a. Carry out blast hole layout and charge design according to the conventional cutting plan, and open a V-shaped cutting 1 on the conventional tunnel surface. The distance from the widest part of the cutting to the excavation sideline is 0.3 times the tunnel 3 diameter D , the narrowest part of the cut 1 is 0.15 times the diameter D of the tunnel 3;

[0029] b. Drilling blastholes for excavation and blastholes for stress relief 2 on the digging face, where the layout of the blastholes for caving and blastholes for smooth surfaces in the blastholes for excavation is designed with reference to the conventional arrangement, and the blastholes for stress relief 2 has four columns, a total of sixteen, symmetrically distributed on both sides of the cut 1, and the distance from the excavation line of the two side walls is...

Embodiment 2

[0034] Embodiment 2: Excavation method for prevention and control of strong rockburst at face, characterized in that the specific steps include,

[0035] a. Carry out blast hole layout and charge design according to the conventional cutting scheme, and open a V-shaped cutting 1 on the conventional tunnel face, the distance from the widest part of the cutting to the excavation sideline is 0.3 times the tunnel 3 diameter D , the narrowest part of the cut 1 is 0.15 times the diameter D of the tunnel 3;

[0036] b. Drilling and setting excavation blastholes and stress relief blastholes 2 on the digging face, where the layout of the caving blastholes and smooth blastholes in the excavation blastholes is designed with reference to the conventional layout, and the stress relief blastholes 2 has four columns, a total of sixteen, symmetrically distributed on both sides of the cut 1, and the distance from the excavation line of the two side walls is 1m and 2m respectively. The included...

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Abstract

The invention relates to a digging method for preventing a strong or strong rock burst on an active face. The technical problem to be solved is to provide an active face strong or strong rock burst prevention digging method capable of effectively reducing the rock burst frequency on the active face and reducing the destructiveness of the rock burst. The method comprises the following specific steps: a, carrying out the shothole arrangement and charging design according to a conventional slotting proposal; b, drilling tunneling shotholes and stress-relief shotholes on the slotted active face; c, charging the tunneling shotholes in a convention mode, and charging the stress-relief shotholes in the 32 mm hole bottom within a deep buried range from 2 to 3m; d, detonating the stress-relief shotholes and the tunneling shotholes in turn; and e, tapping slag, and repeating the steps till the digging is completed. The method is mainly applied to deep buried hard rock tunnel projects for traffic, mining, water conservancy and hydraulic power, and the like.

Description

technical field [0001] The invention relates to an excavation method for prevention and control of strong or extremely strong rockburst on the face of the face. It is mainly suitable for deep buried hard rock tunnel projects such as transportation, mining, water conservancy and hydropower. Background technique [0002] In areas with intense tectonic movement, various forms of rockbursts are often encountered during the construction of deep-buried hard rock tunnels. Among them, the strong and extremely strong rockbursts that occur on the face of the tunnel seriously threaten the safety of construction workers and mechanical equipment. most serious threat. Such as figure 1 The conventional face shown is prone to rockburst if excavation and blasting are carried out directly. Moreover, the rockburst on the working face has a strong deterrent effect on the psychology of the construction workers. Once entering the potential strong rockburst section, it is not uncommon for worke...

Claims

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Application Information

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IPC IPC(8): E21D9/00F42D3/04F42D1/02
Inventor 张春生褚卫江单治纲周垂一
Owner POWERCHINA HUADONG ENG COPORATION LTD
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