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Tunnel medium-length hole smooth blasting method

A technology of smooth blasting and roadway, applied in blasting and other directions, can solve the problems of many holes, difficult to obtain medium and deep hole blasting effect, and complicated operation.

Inactive Publication Date: 2010-06-16
NANJING INST GENERAL INST OF COAL SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Especially in the drilling and blasting operations of "moderately explosive and hard-to-explode" rock mass roadways, simple straight-hole cutting and oblique-hole cutting blasting technologies are used, such as "diamond cutting blasting technology", "spiral cutting blasting technology", " Step-by-step cutting blasting technology", "triangular step-by-step cutting blasting technology" and "wedge cutting technology", etc., are difficult to obtain good results due to poor cutting effect, complicated operation, or too many holes. Medium and deep hole blasting effect

Method used

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  • Tunnel medium-length hole smooth blasting method
  • Tunnel medium-length hole smooth blasting method
  • Tunnel medium-length hole smooth blasting method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The excavation section is 10.49m 2 (3.6m×3.3m), the rock mass structure is fragmented and fragmented massive rock roadway, the method of implementing medium and deep hole smooth surface blasting is as follows.

[0027] (1) The technological process of implementing medium-deep hole smooth surface blasting on the full section is: preparation-pointing-drilling-drilling-blast hole-charging (simultaneous cutting)-connection-blasting-ventilation-slag removal-bolt / hanging net- Circulation - Shotcrete. Among them, part of the operation time can be paralleled for eyedropping and perforating, and the charging and slitting can be operated in parallel.

[0028] (2) see figure 1 , 2 , using "combined cutting blasting technology" to achieve medium and deep hole blasting.

[0029] ① The cutting form is the "combined cutting" method in which straight eyes and oblique eyes are combined. The number of cut holes is 6, which are holes 1 to 6, and holes 1 to 6 form a cut hole group. E...

Embodiment 2

[0047] The excavation section is 13.08m 2 (4.2m×3.5m), the rock mass structure is still fragmented and fragmented massive rock mass structure, adopt the following method to carry out medium and deep hole smooth surface blasting.

[0048] (1) The technical process and the machines and tools, equipment and safety technical measures adopted are the same as those in Embodiment 1.

[0049] (2) This embodiment also adopts "combined cutting blasting technology" and "convenient energy-directed smooth blasting technology" to achieve smooth blasting effects in medium and deep holes. The difference is that the method and parameters of "combined cutting blasting" and the parameters of "portable energy directional smooth blasting technology" have been slightly changed to meet the requirements of medium-deep hole smooth blasting after the section is enlarged. Its main points are:

[0050] ① "Combined cutting blasting technology" under the condition of enlarged section.

[0051] see Fig...

Embodiment 3

[0067] For the excavation section is 13.08m 2 (4.2m×3.5m), when the roadway is in a rock mass structure that is difficult to blast, adopt the following method to achieve the smooth blasting effect of medium and deep holes.

[0068] (1) The technological process and the implements, equipment and safety technical measures adopted in the present embodiment are the same as in the second embodiment.

[0069] (2) This embodiment also adopts the "portable energy-directed smooth surface blasting technology" to achieve the smooth surface blasting effect, and the surrounding ophthalmic rolls are "cut" in the same manner as in Embodiment 1. The difference is that this embodiment adopts the enhanced "double-slant eye combined cutting blasting technology" to enhance the cutting effect and realize the blasting effect of medium and deep holes. Its main points are:

[0070] ①Double squint combined cutting blasting technology. see Figure 7 , Figure 8 .

[0071] The cutout eye group con...

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Abstract

The invention provides a tunnel blasting method, in particular to a medium-length hole smooth blasting method. The method can not only realize good medium-length hole smooth blasting effect and facilitate the downhole operation of a coal mine, but also realize the more extensive applicability. The portable energy directional smooth blasting technology and the combined cutting blasting technology are adopted in the method. The tunnel blasting method mainly solves the two key technologies of the smooth blasting technology and the cutting blasting technology, and the full-section blasting process and the parameters are set on the basis of the two key technologies, thereby achieving the medium-length hole smooth blasting effect that the desired hole depth is not more than 3m. To this end, theportable energy directional smooth blasting technology is adopted, thereby realizing the good smooth blasting effect under the conditions of simple operation and low cost; and the combined cutting blasting technology with combined oblique cut and shatter cut is adopted, thereby achieving the good medium-length hole smooth blasting effect in middle explosive and difficult explosive rock bodies.

Description

technical field [0001] The present invention relates to a roadway blasting method, in particular to a new method of smooth surface blasting for deep holes in coal mine roadways, and in particular to a "portable energy directional smooth surface blasting technology" suitable for "moderately explosive and difficult to blast" rock mass roadways It is a new medium-deep hole smooth surface blasting method combined with "combined cutting blasting technology". Background technique [0002] Drilling and blasting is the main way of excavation in coal mine roadway excavation in my country and it will last for a long time. After years of practice and development, my country's coal mine blasting technology has made great progress in technology, equipment and safety technology. However, on the whole, the instability of optical blasting effect and low cycle footage in drilling and blasting operations in coal mines in my country are still common problems, especially in blasting operations...

Claims

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Application Information

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IPC IPC(8): F42D3/04F42D1/02
Inventor 张少波高有存樊玉泉徐长德王庆路李占成吴建生宋大军李培新张立洋魏国
Owner NANJING INST GENERAL INST OF COAL SCI
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