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Blasting method of forced top-caving with cut-out hole

A technology of cutting holes and dicing, which is applied in tunnel engineering, forced caving and blasting in coal mining, and tunnel engineering. , easy to collapse effect

Active Publication Date: 2017-06-23
CHINA UNIV OF MINING & TECH (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method transforms the roof from being supported on four sides to being supported on three sides and falling on one side, the collapse is not very ideal due to the integrity of the extremely thick and hard roof and the huge plate size (see figure 1 )

Method used

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  • Blasting method of forced top-caving with cut-out hole
  • Blasting method of forced top-caving with cut-out hole
  • Blasting method of forced top-caving with cut-out hole

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Embodiment Construction

[0029] Preferred embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although preferred embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure can be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0030] figure 2 It shows a flow chart of the forced caving blasting method of block cutting hole according to the first exemplary embodiment, image 3 shows a schematic diagram of parallel blasthole and vertical blasthole arrangements in an exemplary embodiment, Figure 4 shows along the image 3 The B-B cross-sectional schematic diagram in, Figure 5 shows along the image 3 The schematic diagram of the C-C section in , where the B-B ...

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Abstract

A block cutting type cut hole forced caving detonation method comprises the following steps that firstly, on a cut hole top plate, a plurality of parallel shot hole sets are formed in one plane parallel to the axial direction of cut holes in parallel, wherein each parallel shot hole set comprises at least one parallel shot hole, and the included angle a1 between each parallel shot hole and the surface of the top plate ranges from 70 degrees to 85 degrees and faces the work face advancing direction; and secondly, on the cut hole top plate, each of multiple planes perpendicular to the axial direction of the cut holes is internally provided with a vertical shot hole set, and each vertical shot hole set comprises at least one vertical shot hole, wherein the included angle a2 between each vertical shot hole and the surface of the top plate ranges from 35 degrees to 85 degrees and faces the work face advancing direction, and in the axial direction, each vertical shot hole set is arranged between every two corresponding adjacent parallel shot hole sets. According to the method, it can be ensured that the cut hole top plate is advanced along with a work face and is collapsed in time, the roof weighting step at the initial stage is reduced, large-area top plate exposure is reduced, and the danger of rock burst is avoided.

Description

technical field [0001] The disclosure relates to tunnel engineering, shaft engineering, coal mining forced caving blasting technology, in particular to a block-cut hole-cutting forced caving blasting method. Background technique [0002] During tunnel or roadway construction, during the advancing process of the working face, the hard and thick roof is not easy to collapse, which often causes the exposed roof area of ​​the working face to be too large, the pressure of the surrounding rock is large, the mining pressure is concentrated in time and strong, and extremely It is easy to cause large-scale roof caving and coal wall spalling accidents, and at the same time, it will crush or even crush the support, posing a great threat to the mining face. In addition, a large-area empty roof is likely to cause the sudden ejection of gas and other harmful gases, causing disasters such as gas explosions. [0003] For the working face with a hard roof, the forced caving blasting of the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F42D3/04F42D1/00
CPCF42D1/00F42D3/04
Inventor 宋俊生杨仁树
Owner CHINA UNIV OF MINING & TECH (BEIJING)
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