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A Blasting Treatment Method for Double Layer Overlapping Goaf

A treatment method and goaf technology, applied in blasting and other directions, can solve problems such as low efficiency and complicated process

Active Publication Date: 2021-09-14
ANSTEEL GRP MINING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a method for blasting treatment of double-layer overlapping goafs, which solves the problems of complex procedures and low efficiency in the process of processing double-layer overlapping goafs. h , design the treatment method of the upper and lower goaf roofs, reduce the difficulty of double-layer overlapping goaf treatment, and improve the safety of construction

Method used

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  • A Blasting Treatment Method for Double Layer Overlapping Goaf
  • A Blasting Treatment Method for Double Layer Overlapping Goaf
  • A Blasting Treatment Method for Double Layer Overlapping Goaf

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The rock mass in the double-layer goaf is mainly composed of phyllite with a rock density of 1300-1800kg / m 3 , the Platts firmness coefficient is 10, the length of the upper roof in the upper goaf is 100 m, the width is 50 m, the thickness of the roof is 11-20 m, the length of the lower roof is 150 m, the width is 80 m, the thickness of the lower roof is 10-16 m, the upper roof and The height between the lower roof slabs is 35 m.

[0034] Concrete process implementation steps are as follows:

[0035] 1) According to the measured data, arrange blastholes 31 on the roof of the upper goaf, blastholes 32 on the roof of the upper goaf in the overlapping area and penetration holes 2 in the upper goaf in the overlapping area. The bottom of the blastholes is 3m away from the lower boundary of the upper roof. The hole spacing is 7 m, the row spacing is 5 m, and the hole diameter is 220 mm, of which the outermost blast holes are 1 m from the boundary of the overlapping area;

...

Embodiment 2

[0045] The rock mass in the double-layer goaf is mainly composed of magnetite quartzite with a rock density of 3300-3400 kg / m 3 , the Platts firmness factor is 12-16, the length of the upper gob is 90 m, the width is 50 m, the thickness of the roof is 11-20 m, the length of the lower roof is 80 m, the width is 80 m, and the thickness of the lower roof is 13-18 m. The height between the upper roof and the lower roof is 30 m.

[0046] Concrete process implementation steps are as follows:

[0047] 1) According to the measured data, arrange blastholes 31 on the roof of the upper goaf, blastholes 32 on the roof of the upper goaf in the overlapping area and penetration holes 2 in the upper goaf in the overlapping area. The bottom of the blastholes is 3m away from the lower boundary of the upper roof. The hole spacing is 6 m, the row spacing is 4 m, and the hole diameter is 220 mm, of which the outermost blast hole is 1 m from the border of the overlapping area;

[0048] 2) Accordi...

Embodiment 3

[0057] The rock mass in the double-layer goaf is mainly composed of granite with a rock density of 2700-3000 kg / m 3 , the Platts firmness coefficient is 10, the length of the upper roof in the upper goaf is 90 m, the width is 50 m, the thickness of the roof is 14-18 m, the length of the lower roof is 100 m, the width is 70 m, the thickness of the lower roof is 12-17 m, the upper roof and The height between the lower roof slabs is 40 m.

[0058] Concrete process implementation steps are as follows:

[0059] 1) According to the measured data, arrange blastholes 31 on the roof of the upper goaf, blastholes 32 on the roof of the upper goaf in the overlapping area and penetration holes 2 in the upper goaf in the overlapping area. The bottom of the blastholes is 3m away from the lower boundary of the upper roof. The hole spacing is 6 m, the row spacing is 4 m, and the hole diameter is 220 mm, of which the outermost blast hole is 1 m from the border of the overlapping area;

[0060...

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Abstract

The invention relates to a blasting treatment method for a double-layer overlapping goaf, comprising the following steps: using a three-dimensional laser scanner to detect the double-layer overlapping goaf, obtaining detection data, detecting data, and arranging blastholes on the roof of the upper goaf , the blastholes on the roof of the upper goaf, the blastholes on the roof of the lower goaf, and the ultra-deep blastholes around the upper goaf are filled with detonating bombs and emulsion explosives. The primary detonating bomb and emulsion explosive are located at the bottom and upper middle of the blast hole. According to the measured data, the time t from the roof collapse of the upper goaf to the lower roof is calculated, and the nonel connecting the blast hole of the upper goaf roof in the overlapping area is formed. For a complete blasting network, according to the time t from the collapse of the roof of the upper goaf to the roof of the lower goaf, the delay time of the micro-detonation of the roof of the lower goaf is designed, so that when the lower blast hole is detonated, the rocks on the upper roof fall and impact the lower layer The roof is fully caved in.

Description

technical field [0001] The invention belongs to the technical field of mining engineering and blasting engineering, and relates to a double-layer goaf processing operation, in particular to a double-layer overlapping goaf blasting processing method. Background technique [0002] At present, the naturally formed double-layer goaf has the characteristics of wide distribution, difficulty in processing, strong concealment, poor regularity of spatial distribution characteristics, and serious consequences of goaf accidents. The drop impacts the lower roof, causing damage to the rock mass of the lower roof, and there are certain safety hazards when dealing with the lower roof. Liao Jiangnan used the deep hole treatment method in the open pit and the shallow hole treatment method in the goaf to deal with the overlapped goaf. The open-pit deep hole treatment method is to use the open-pit deep hole to collapse the roof rock mass of the goaf, and let its top pillar fall into the lower...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F42D1/08F42D3/04
CPCF42D1/08F42D3/04
Inventor 王永增王润曹洋孟磊磊李广尚李小帅徐振洋
Owner ANSTEEL GRP MINING CO LTD
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